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  Subjects -> ENGINEERING (Total: 2269 journals)
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ENGINEERING (1201 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 207)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 4)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 6)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Artificial Neural Systems     Open Access   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 18)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 7)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 34)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 28)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access  
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal  
ASEE Prism     Full-text available via subscription   (Followers: 2)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 7)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 9)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 24)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 8)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 40)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 4)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 10)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 20)
Clay Minerals     Full-text available via subscription   (Followers: 8)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 10)
Coastal Engineering Journal     Hybrid Journal   (Followers: 3)
Coatings     Open Access   (Followers: 2)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Composite Interfaces     Hybrid Journal   (Followers: 5)
Composite Structures     Hybrid Journal   (Followers: 242)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 175)
Composites Part B : Engineering     Hybrid Journal   (Followers: 215)
Composites Science and Technology     Hybrid Journal   (Followers: 159)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 25)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 5 6 7 | Last

Journal Cover Case Studies in Thermal Engineering
  [SJR: 0.966]   [H-I: 7]   [4 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Online) 2214-157X
   Published by Elsevier Homepage  [3041 journals]
  • Enhancement of heat transfer in six-start spirally corrugated tubes

    • Authors: Hyder H. Balla
      Pages: 79 - 89
      Abstract: Publication date: March 2017
      Source:Case Studies in Thermal Engineering, Volume 9
      Author(s): Hyder H. Balla
      The utilization of corrugation for improvement in heat transfer is increasingly becoming interesting recently due to its combined advantages such as extended surfaces, turbulators as well as roughness. This study employed the use of both numerical as well as experimental settings on the water flowing at lower Reynolds numbers in a corrugated tubes with spiral shape to evaluate the performance of heat in a newly designed corrugation style profile. The total performance of the heat for the corrugation tubes were determined and the mathematical information generated from both the Nusselt number and the factors of friction were equated with those of the experimentally generated outcome for both standard smooth as well as the corrugated tubes. Analysis of the dat generated revealed improvements in heat transfer ranges of (2.4–3.7) times those 0btained from the smooth tubes with significant increase in the friction factors of (1.7–2.3) times those of the smooth tubes. Based on the findings of study, it was concluded that for extended period and extensive range use, tubes with severity index values at 36.364×10–3 could produce better heat performance (1.8–3.4) at Reynolds numbers ranging from 100 to 1300. This was an indication that the geometric expression with spiral corrugation profile could significantly enhance the efficiency of heat transfer with significantly increased friction factors.

      PubDate: 2017-01-11T18:34:02Z
      DOI: 10.1016/j.csite.2017.01.001
      Issue No: Vol. 9 (2017)
       
  • Effect of square wings in multiple square perforated twisted tapes on
           fluid flow and heat transfer of heat exchanger tube

    • Authors: Amar Raj Singh Suri; Anil Kumar; Rajesh Maithani
      Pages: 28 - 43
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Amar Raj Singh Suri, Anil Kumar, Rajesh Maithani
      This work presents, an experimental study on Nusselt number ( Nu rs ) and friction factor ( f rs ) of heat exchanger circular tube fitted with multiple square perforated with square wing twisted tape inserts. The experimental determination encompassed the geometrical parameters namely, wing depth ratio ( W d / W T ) of 0.042–0.167, perforation width ratio ( a / W T ) of 0.250, twist ratio ( T L / W T ) of 2.5, and number of twisted tapes ( N T ) of 4.0. The effect of multiple square perforated twisted tape with square wing has been investigated for the range of Reynolds number ( Re n ) varied from 5000 to 27,000. The maximum enhancement in Nu rs and f rs is observed to be 6.96 and 8.34 times of that of the plain circular tube, respectively. Correlations of Nu rs , f rs and η p are established in term of Re n and geometrical parameters of wings twisted tape which can be used to predict the values of Nu rs , f rs and η p with considerably good accuracy.

      PubDate: 2017-03-15T09:53:52Z
      DOI: 10.1016/j.csite.2017.03.002
      Issue No: Vol. 10 (2017)
       
  • Investigation of intercooler-effectiveness on exergo-economic and
           exergo-sustainability parameters of modified Brayton cycles

    • Authors: Fidelis.I. Abam; Tobinson A. Briggs; Ekwe. B. Ekwe; Samuel O Effiom
      Abstract: Publication date: Available online 3 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Fidelis.I. Abam, Tobinson A. Briggs, Ekwe. B. Ekwe, Samuel O Effiom
      The paper investigates the variants of intercooler effectiveness on exergo-economic and exergo-sustainability indicators of modified Brayton cycles. The objective is to ascertain how the variant in the intercooler effectiveness affects the exergy-based parameters. However, to achieve this, a component by component exergy-cost balances was established. The considered cycles include: the non-specific cycle (Case 1) comprising a gas turbine (GT), intercooler (IC), heat exchanger (HE) and reheat system (REH), others include (GT+H+REH +ST, Case 2), (GT+HE +IC +REH +ST+FWH, Case 3) and (GT+HE+IC+REH +ST+2 FWH, Case 4). The calculated cycle efficiencies (Cases 1 to 4) varies from 17.59 to 28.84% for intercooler effectiveness of 0.75 and 0.95. The exergy destruction within this range was 0.97%, 1.26%, 0.89% and 1.23% (Cases 1, 2 3 and 4) respectively. The component exergy destruction cost (CEDC) fluctuated between 3   . 85 ≤ CEDC ≤ 229 . 1 $ / hr ,   5 . 61 E − 06 ≤ CEDC ≤ 229 . 1 $ / h ,   1 . 46 E − 06 ≤ CEDC ≤ 229 . 1 $ / hr and 5 . 61 E − 06 ≤ CEDC ≤ 229 . 1 $ / hr for same order. Additionally, the exergo-sustainability indicators: exergy waste ratio (EWR), environmental effect factor (EFF) and exergetic sustainability index (ESI) were estimated between 17 . 59 ≤ EEF ≤ 28 . 84   % ,   0 . 433 ≤ EWR ≤ 0 . 635   9 , 1.55 ≤ EFF ≤ 3.60 and 0.277 ≤ ESI ≤ 0.644. Conclusively, the intercooler and other modifications have a marginal effect but Cases 4 and 3 was most sustainable with considerable ESI.

      PubDate: 2017-03-07T15:13:05Z
      DOI: 10.1016/j.csite.2017.03.001
       
  • Mechanical drive gas turbine selection for service in two natural gas
           pipelines in Nigeria

    • Authors: Ogbonnaya Agwu; Chigozie Eleghasim
      Abstract: Publication date: Available online 28 February 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Ogbonnaya Agwu, Chigozie Eleghasim
      The performance characteristics of land-based gas turbines are known to be greatly affected by ambient and operating conditions including inevitable machine deterioration. This study makes a selection of gas turbines for use as compressor station drivers on two natural gas pipelines in Nigeria taking into account the local site conditions of ambient temperature and altitude as well as some level of turbine deterioration. The analysis involved modelling and simulating the on-site performance of five gas turbine engines within the power requirement range of the compressor stations as dictated by pipeline gas flow studies. The overall effect of all considered factors was an engine thermal efficiency loss of 5.3% and a 26.3% decrement in power output. Selected turbines for driving the compressor stations must therefore have a minimum of 26.3% more power output than the value established by pipeline flow analyses. More generally, the results suggest that gas pipelines of 24-inch diameter with a throughput of 450 MMSCFD require a compression power of about 0.04MW/km if flow pressure is to be maintained at a minimum of 50bar. Also, a gas turbine driver should be capable of 0.05MW/km of pipeline given the local site conditions and engine deterioration.

      PubDate: 2017-03-01T15:08:39Z
      DOI: 10.1016/j.csite.2017.02.003
       
  • Numerical and experimental investigation of thermoelectric cooling in
           down-hole measuring tools; A Case study

    • Authors: Rohitha Weerasinghe; Thomas Hughes
      Abstract: Publication date: Available online 13 February 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Rohitha Weerasinghe, Thomas Hughes
      Use of Peltier cooling in down-hole seismic tooling has been restricted by the performance of such devices at elevated temperatures. Present paper analyses the performance of Peltier cooling in temperatures suited for down-hole measuring equipment using measurements, predicted manufacturer data and computational fluid dynamic analysis. Peltier performance prediction techniques is presented with measurements. Validity of the extrapolation of thermoelectric cooling performance at elevated temperatures has been tested using computational models for thermoelectric cooling device. This method has been used to model cooling characteristics of a prototype downhole tool and the computational technique used has been proven valid.

      PubDate: 2017-02-15T14:34:23Z
      DOI: 10.1016/j.csite.2017.02.002
       
  • Effect of Retro-Reflective Materials on Temperature Environment in Tents

    • Authors: Lili Zhang; Xi Meng; Fei Liu; Long Xu; Enshen Long
      Abstract: Publication date: Available online 7 February 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Lili Zhang, Xi Meng, Fei Liu, Long Xu, Enshen Long
      Due to the low thermal inertia and poor thermal insulation of ultrathin envelope in tents, its indoor temperature environment is extremely bad and its occupants are tormented. Especially under the high solar radiation, both indoor air temperature and inner surface radiation temperature increase rapidly. And thereby, decreasing radiation heat gain in summer is necessary to refine indoor temperature environment in tents. Retro-reflective materials make it a reasonable choice due to their high reflectivity for solar radiation. To reveal the temperature environment improvement of tents by integrating with retro-reflective materials, a comparative experiment is carried out under the summer climatic conditions of Chengdu city, China. Experimental results show that due to integrating with retro-reflective materials, indoor air peak temperature in the tent can be reduced by more than 7.7°C, while inner surface radiant temperature can be lowered up to 4.8°C in the day time. It shows retro-reflective materials could refine indoor temperature environment in tents. Through a comparison of the walls in different orientations, on which retro-reflective materials are covered, the top, east and north walls are found to be better choices, while the north wall is the worst one for retro-reflective materials.

      PubDate: 2017-02-08T18:53:16Z
      DOI: 10.1016/j.csite.2017.02.001
       
  • Numerical analysis of thermal hydraulic performance of Al2O3–H2O
           nanofluid flowing through a protrusion obstacles square mini channel

    • Authors: Sunil Kumar; Alok Darshan Kothiyal; Mangal Singh Bisht; Anil Kumar
      Abstract: Publication date: Available online 31 January 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Sunil Kumar, Alok Darshan Kothiyal, Mangal Singh Bisht, Anil Kumar
      In this study, numerical investigation has been carried out for a range of system and operating parameters in order to analyze the effect of protrusion obstacles on heat and fluid flow characteristics of nanopartical Al 2 O 3 with concentration 4.0% and diameter 30 nm in square mini channel. The square mini channel has, stream wise spacing ( X s / d p ) range of 1.4–2.6, span wise spacing ( Y s / d p ) range of 1.4–2.6, ratio of protrusion height to print diameter ( e p / d p ) of 1.67 and Reynolds number ( Re n ) ranges from 4000–18000. Simulations were carried out to obtain heat and fluid flow behaviour of smooth and rough tube, using commercial CFD software, ANSYS 16.0 (Fluent). Renormalization k − ε model was employed to assess the influence of protrusion on turbulent flow and velocity field. Simulation results show that, the enhancement of 3.73 times in heat transfer and 4.25 times enhancement in pressure drop as a function of X s / d p and Y s / d p of 1.8 respectively.

      PubDate: 2017-02-02T18:49:21Z
      DOI: 10.1016/j.csite.2017.01.004
       
  • Study of thermal effectiveness and its relation with NTU in shell and
           helically coiled tube heat exchangers

    • Authors: Ashkan Alimoradi
      Abstract: Publication date: Available online 26 January 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Ashkan Alimoradi
      In the present study, the effect of operational and geometrical parameters on the thermal effectiveness of shell and helically coiled tube heat exchangers was investigated. Analysis was performed for the steady state. The working fluid of both sides is water, with its viscosity and thermal conductivity were assumed to be dependent on temperature. Based on the results two correlations were developed to predict the thermal effectiveness for wide ranges of mass flow rates ratio, dimensionless geometrical parameters and and product of Reynolds numbers. Also it was found that, for same values of NTU and Cr, the effectiveness is averagely 12.6% less than the effectiveness of parallel flow heat exchangers and this difference is approximately constant.

      PubDate: 2017-01-27T18:45:33Z
      DOI: 10.1016/j.csite.2017.01.003
       
  • Static analysis of triple-effect adsorption refrigeration with compressor

    • Authors: Fumi Watanabe; Atsushi Akisawa
      Abstract: Publication date: Available online 16 January 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Fumi Watanabe, Atsushi Akisawa
      In order to improve the efficiency of the adsorption refrigeration cycle, this study proposes a triple-effect adsorption refrigeration cycle equipped with a compressor. This cycle can run in order to create a large variation in adsorbent concentration range by the compressor, even if there is little temperature variation in the desorption and adsorption processes. The objective of this study is to clarify the effect that regulating adsorption pressure using a compressor has on the adsorption refrigeration cycle, and to that end cycle efficiency was calculated using a static analysis based on a state of equilibrium. As a results from the simulation, the triple-effect cycles can operate by regulating adsorption pressure. Both COP and exergy efficiency can be improved by a factor of 1.2 if the cycled is regulated the adsorption pressure of each cycle rather than using a shared adsorption pressure. For heat sources in the temperature range of 70–100°C, this method is superior in terms of COP and exergy efficiency. COP values of approximately 1.7–1.8 can be obtained, which is three times higher than single-effect cycles. The triple-effect cycles have one-third the SCE of single-effect cycles but about the same SCE as double-effect cycles.

      PubDate: 2017-01-19T18:40:19Z
      DOI: 10.1016/j.csite.2017.01.002
       
  • Energic, Exergic, Exergo-economic investigation and optimization of
           Auxiliary Cooling System (ACS) equipped with Compression Refrigerating
           System (CRS)

    • Authors: Omid Karimi Sadaghiyani; Shahram Khalilaria; Iraj Mirzaee
      Abstract: Publication date: Available online 3 January 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Omid Karimi Sadaghiyani, Shahram Khalilaria, Iraj Mirzaee
      Heller main cooling tower as air-cooled heat exchanger is used in the combined cycle power plants (CCPP) to reduce the temperature of condenser. In extreme summer heat, the efficiency of the cooling tower is reduced and it lessens performance of Steam Turbine Generation (STG) unit of Combined Cycle Power Plant (CCPP). Thus, the auxiliary cooling system (ACS) is equipped with compression refrigerating system (CRS). This auxiliary system is linked with the Heller main cooling tower and improves the performance of power plant. In other words, this auxiliary system increases the generated power of STG unit of CCPP by decreasing the temperature of returning water from cooling tower Therefore, in the first step, the mentioned auxiliary cooling system (ACS) as a heat exchanger and compression refrigerating system (CRS) have been designed via ASPEN HTFS and EES code respectively. In order to validate their results, these two systems have been built and theirs experimentally obtained data have been compared with ASPEN and EES results. There are good agreements between results. After that, exergic and exergo-economic analysis of designed systems have been carried out. Finally, the compression refrigerating system (CRS) has been optimized via Genetic Algorithm (GA). Increasing in exergy efficiency ( ε ) from 14.23% up to 36.12% and decreasing the total cost rate ( C ̇ System ) from 378.2 ($/h) to 308.2 ($/h) are as results of multi-objective optimization.

      PubDate: 2017-01-11T18:34:02Z
      DOI: 10.1016/j.csite.2016.12.004
       
  • A comparative thermodynamic analysis of ORC and Kalina cycles for waste
           heat recovery: A case study for CGAM cogeneration system

    • Authors: Arash Nemati; Hossein Nami; Faramarz Ranjbar; Mortaza Yari
      Pages: 1 - 13
      Abstract: Publication date: March 2017
      Source:Case Studies in Thermal Engineering, Volume 9
      Author(s): Arash Nemati, Hossein Nami, Faramarz Ranjbar, Mortaza Yari
      A thermodynamic modeling and optimization is carried out to compare the advantages and disadvantages of organic Rankine cycle (ORC) and Kalina cycle (KC) as a bottoming cycle for waste heat recovery from CGAM cogeneration system. Thermodynamic models for combined CGAM/ORC and CGAM/KC systems are performed and the effects of some decision variables on the energy and exergy efficiency and turbine size parameter of the combined systems are investigated. Solving simulation equations and optimization process have been done using direct search method by EES software. It is observed that at the optimum pressure ratio of air compressor, produced power of bottoming cycles has minimum values. Also, evaporator pressure optimizes the performance of cycle, but this optimum pressure level in ORC (11bar) is much lower than that of Kalina (46bar). In addition, ORC's simpler configuration, higher net produced power and superheated turbine outlet flow, which leads to a reliable performance for turbine, are other advantages of ORC. Kalina turbine size parameter is lower than that of the ORC which is a positive aspect of Kalina cycle. However, by a comprehensive comparison between Kalina and ORC, it is concluded that the ORC has significant privileges for waste heat recovery in this case.

      PubDate: 2016-11-25T02:00:52Z
      DOI: 10.1016/j.csite.2016.11.003
      Issue No: Vol. 9 (2016)
       
  • Performance evaluation of premixed burner fueled with biomass derived
           producer gas

    • Authors: P. Punnarapong; T. Sucharitakul; N. Tippayawong
      Pages: 40 - 46
      Abstract: Publication date: March 2017
      Source:Case Studies in Thermal Engineering, Volume 9
      Author(s): P. Punnarapong, T. Sucharitakul, N. Tippayawong
      Energy consumption of liquefied petroleum gas (LPG) in ceramic firing process accounts for about 15–40% of production cost. Biomass derived producer gas may be used to replace LPG. In this work, a premixed burner originally designed for LPG was modified for producer gas. Its thermal performance in terms of axial and radial flame temperature distribution, thermal efficiency and emissions was investigated. The experiment was conducted at various gas production rates with equivalence ratios between 0.8 and 1.2. Flame temperatures of over 1200°C can be achieved, with maximum value of 1260°C. It was also shown that the burner can be operated at 30.5–39.4kWth with thermal efficiency in the range of 84 – 91%. The maximum efficiency of this burner was obtained at producer gas flow rate of 24.3 Nm3/h and equivalence ratio of 0.84.

      PubDate: 2016-12-09T18:11:41Z
      DOI: 10.1016/j.csite.2016.12.001
      Issue No: Vol. 9 (2016)
       
  • Heat and mass transfer parameters in the drying of cocoyam slice

    • Authors: Macmanus C. Ndukwu; Cyprian Dirioha; Fidelis I. Abam; Victor E. Ihediwa
      Pages: 62 - 71
      Abstract: Publication date: March 2017
      Source:Case Studies in Thermal Engineering, Volume 9
      Author(s): Macmanus C. Ndukwu, Cyprian Dirioha, Fidelis I. Abam, Victor E. Ihediwa
      The paper investigates some heat and mass transfer parameters (HMTPs) of three varieties of cocoyam slice and their vitamin B retention level in convective drying. The varieties include Colocasia esculenta (COE) and xanthosoma sagittiffolium (white flesh – NX01, red flesh – NX02). The objective is to generate HMTPs for process model development, applied in dryer design. The oven and sun drying procedures were employed where temperatures were maintained between 50 and 70°C (oven drying) and sun drying, the readings were observed at every one hour. The results obtained show that the mass transfer coefficient for the three varieties lies between 1.01044×10−6 and 3.44876×10−6 m/s while the heat transfer coefficient ranged from 1.17973 to 3.58284W/m2 K. The specific energy consumption for drying was estimated at 14.15, 25.16 and 35.07 kWh/kg for NX02, NX01, and COE respectively, at drying temperature (DT) of 60°C. However, at DT range between 50 and 70°C the moisture extraction rate was varied from 0.047 to 0.185kg/kWh, for NX02, 0.070–0.258kg/kWh for NX01 and 0.099–1.42kg/kWh for COE, with vitamin B retention level ranging from 70.13% to 100% at all DTs for the varieties.

      PubDate: 2016-12-16T18:16:41Z
      DOI: 10.1016/j.csite.2016.12.003
      Issue No: Vol. 9 (2016)
       
  • Experimental investigation on the flow behaviour in a bubble pump of
           diffusion absorption refrigeration systems

    • Authors: Ali Benhmidene; Khaoula Hidouri; Béchir Chaouachi; Slimane Gabsi; Mahmoud Bourouis
      Pages: 1 - 9
      Abstract: Publication date: Available online 9 April 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Ali Benhmidene, Khaoula Hidouri, Béchir Chaouachi, Slimane Gabsi, Mahmoud Bourouis
      An experimental investigation on the performance of a bubble pump for diffusion absorption refrigeration (DAR) systems was carried-out. The characteristics and operating conditions of the bubble pump determine the efficiency of the DAR systems. An experimental set-up operating in continuous mode was designed, built-up and successfully operated as a bubble pump. Experiments were performed by changing some of the parameters affecting the bubble pump performance. The experimental results showed that the performance of the bubble pump was mainly dependent on the driving heat input and the submersion ratio. Driving heat inputs applied were between 20W and 200W for a suitable size of the pump tubes. Three submersion ratios were tested, namely 25%, 35% and 45%. The results obtained showed that an oscillating flow was present in the operation of the bubble pump and the frequency of oscillation increased with the increase of the submersion ratio. The average mass flow rate of the refrigerant (ammonia) pumped increased with increase in the heating power; however, mass flow rates of the poor and rich solutions were function of the flow regime. In addition, experimental results were used to determine the optimal heating power for the different submersion ratios considered in this study. The optimal heating power ranged from 30W to 130W for a submersion ratio of 25% and from 30W to 80W for the submersion ratios of 35% and 45%.

      PubDate: 2016-04-09T16:37:59Z
      DOI: 10.1016/j.csite.2016.04.002
      Issue No: Vol. 8 (2016)
       
  • Experimental studies on the effects of spacing on dripping behavior of
           thin polymethyl-methacrylate slab

    • Authors: Hui Zhu; Yunji Gao; Guoqing Zhu
      Pages: 10 - 18
      Abstract: Publication date: Available online 23 April 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Hui Zhu, Yunji Gao, Guoqing Zhu
      Experiments were carried out to study the dripping behavior of vertical burning thermally thin polymethyl-methacrylate (PMMA) with different spacings parallel to the wall. With spacings of 7, 10, 13, 16, 19, 22, and 25 mm, the dripping behavior was studied by infrared video image analysis, and the mass retention was recorded by the load cells. As the spacing increased, the dripping time, dripping mass, and burnout growth distance first increased and then decreased. The minimum value was observed at the 13 mm case. The dripping behavior is assumed to correspond to the net heat flux to the surface, extensional viscosity, and gravitational force of melting PMMA. In this study, the dripping behavior was investigated using uniform PMMA samples with 200 mm height, 50 mm width, and 2 mm thickness.

      PubDate: 2016-04-24T08:15:09Z
      DOI: 10.1016/j.csite.2016.04.004
      Issue No: Vol. 8 (2016)
       
  • Analytical approach for evaluation of thermo hydraulic performance of
           roughened solar air heater

    • Authors: Vipin B. Gawande; A.S. Dhoble; D.B. Zodpe; Sunil Chamoli
      Pages: 19 - 31
      Abstract: Publication date: Available online 13 March 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Vipin B. Gawande, A.S. Dhoble, D.B. Zodpe, Sunil Chamoli
      Mathematical modeling and simulations are seen as vital methodologies to predict the thermal performance optimization of thermal systems. Solar air heater roughened with 20° angled rib is simulated using an algorithm developed in MATLAB to predict the optimal set of design and operating parameters. Correlations developed using second order polynomial are used for simulations. In the entire range of flow rates, the thermal efficiency of the roughened solar air heater is higher as compared to smooth duct. In fixed value of solar insolation, thermal efficiency increases with the increase in mass flow rate while effective efficiency decreases. The effective efficiency of the system increases with an addition in the number of glass covers and width of the duct. Thermal and effective efficiency increases with the increase in solar insolation. An increase in velocity increases the convective heat transfer coefficient of air, which reduces the useful heat gain by increasing the top losses which in turn affects the increase in effective efficiency for the rise in velocity in the solar air heater. The effect of mass flow rate, the number of glass covers, heat flux, velocity and variation in width of duct on thermal and effective efficiencies of roughened solar air heater are presented in the form of plots in the present study.

      PubDate: 2016-03-15T09:36:02Z
      DOI: 10.1016/j.csite.2016.03.003
      Issue No: Vol. 8 (2016)
       
  • Simulation and experimental investigation of the wavy fin-and-tube
           intercooler

    • Authors: Qinguo Zhang; Sicheng Qin; Runda Ma
      Pages: 32 - 40
      Abstract: Publication date: Available online 11 April 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Zhang Qinguo, Sicheng Qin, Runda Ma
      In this paper, flow and heat transfer characteristics in the fin-and-tube intercooler were numerically investigated using the FLUENT software by adopting the porous medium approach, which could obtain the distributions, including temperature, pressure and non-uniform, etc. The effects of the air flow rate on the resistance characteristic and the heat transfer performance were analyzed. The simulation results show that the pressure drop and the heat transfer capacity increase with the increase of air flow rate. Simultaneously, the coolant distribution is uniform in the header with the maximum error within ± 10%. Two kinds of coolant flow schemes have an important influence on heat transfer. Those results also confirm that the higher the heat transfer rate, the lower the inlet coolant temperature is. Finally, comparison results show that the numerical results based on the heat transfer model in porous medium agree well with the measured data based on the engine bench test. The conclusions of this paper are of great significance in the improvement of fin-and-tube intercooler.

      PubDate: 2016-04-13T18:39:11Z
      DOI: 10.1016/j.csite.2016.04.003
      Issue No: Vol. 8 (2016)
       
  • Numerical and experimental study of a corrugated thermal collector

    • Authors: A. Álvarez; J. Tarrío-Saavedra; S. Zaragoza; J. López-Beceiro; R. Artiaga; S. Naya; B. Álvarez
      Pages: 41 - 50
      Abstract: Publication date: Available online 29 April 2016
      Source:Case Studies in Thermal Engineering
      Author(s): A. Álvarez, J. Tarrío-Saavedra, S. Zaragoza, J. López-Beceiro, R. Artiaga, S. Naya, B. Álvarez
      The present work proposes a design for solar thermal collectors and also a numerical simulation analysis procedure to evaluate the collector performance. The performance of this collector is compared with the performance of other two commercial ones by observing both the numerical modeling study and experimental test results. Benefits of using the corrugated parallel approach, in terms of yield, are shown applying a new alternative approach of numerical modeling. A better performance is observed for the corrugated parallel collector, which provides a higher yield using an energy-absorbing surface. Moreover, the proposed numerical methodology could be used to evaluate the performance of other thermal collector configurations.

      PubDate: 2016-04-29T10:25:32Z
      DOI: 10.1016/j.csite.2016.03.007
      Issue No: Vol. 8 (2016)
       
  • Thermodynamic and economic performance improvement of ORCs through using
           zeotropic mixtures: Case of waste heat recovery in an offshore platform

    • Authors: M. Kolahi; M. Yari; S.M.S. Mahmoudi; F. Mohammadkhani
      Pages: 51 - 70
      Abstract: Publication date: Available online 10 May 2016
      Source:Case Studies in Thermal Engineering
      Author(s): M. Kolahi, M. Yari, S.M.S. Mahmoudi, F. Mohammadkhani
      This paper presents a comparative thermodynamic and economic analysis of two kinds of organic Rankine cycles (ORCs) with pure and zeotropic mixtures for recovering waste heat from the exhaust gases of large diesel engines used in the offshore platforms of phase 12 of South Pars Gas on Persian Gulf. The mixtures of three hydrocarbons with two refrigerants in two cycle arrangements (simple ORC and ORC with internal heat exchanger) at different evaporation temperatures are investigated to optimize three indicators. The results showed that both the energy and exergy efficiencies are maximized at particular mass fractions of refrigerants. The ORC with mixture of R236ea/Cyclohexane (with a ratio of 0.6/0.4) has the best performance as its energy and exergy efficiency are 14.57% and 37.84%, respectively. These values are increased to 16.81% and 40.75%, respectively by adding IHE to system. The minimum amount of the specific investment cost for the most cases is achieved at the mass fractions of 0.1 and 0.5 and it is greater for the ORC with IHE. Also the payback period of investment is calculated for comparison of economic value of systems and it is observed that its amounts for the ORC with IHE are greater than simple one.

      PubDate: 2016-05-16T14:12:07Z
      DOI: 10.1016/j.csite.2016.05.001
      Issue No: Vol. 8 (2016)
       
  • Numerical analysis of periodic 3D convective heat transfer in fenestration
           with between-the-glass louvered blinds

    • Authors: Lioua Kolsi
      Pages: 71 - 83
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): Lioua Kolsi
      A three-dimensional unsteady laminar natural convection in fenestration with between-the-glass louvered blinds. The considered system is a 3D vertical cavity with differentially heated vertical walls and with rotatable louvered blinds located exactly midway between the walls. The temperature imposed to the hot wall is periodic to be closer to real conditions. The effects of, louvered blinds inclination, thermal conductivity ratio, period and Rayleigh number on the temperature field, flow structure and heat transfer were examined.

      PubDate: 2016-06-15T20:39:30Z
      DOI: 10.1016/j.csite.2016.05.002
      Issue No: Vol. 8 (2016)
       
  • A practical method for in-situ thermal characterization of walls

    • Authors: Emilio Sassine
      Pages: 84 - 93
      Abstract: Publication date: Available online 24 March 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Emilio SASSINE
      A practical and fast method for thermal characterization of walls based on complex Fourier analysis is proposed to determine the thermal capacitance (defined as the product of density and specific capacity) and the thermal conductivity for a building wall using the monitored inner/outer surface temperatures and outer heat flux. This method is useful for in-situ determination of walls’ thermal properties in stochastic regimes and therefore does not require any particular constraints in boundary condition. The minimum measurement duration was analyzed by determining the relative deviation between consecutive optimal values for R and C in order to reduce as much as possible the monitoring duration for energy auditors without losing accuracy.

      PubDate: 2016-03-25T12:59:36Z
      DOI: 10.1016/j.csite.2016.03.006
      Issue No: Vol. 8 (2016)
       
  • Adaptive Neuro-Fuzzy Inference System of friction factor and heat transfer
           nanofluid turbulent flow in a heated tube

    • Authors: Adnan Mohammed Hussein
      Pages: 94 - 104
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): Adnan Mohammed Hussein
      In this paper, estimating of hydrodynamics and heat transfer nanofluid flow through heated tube has been conducted by using Adaptive Neuro-Fuzzy Inference System (ANFIS). The CFD data related to three types of nanofluids (Al2O3, SiO2 and TiO2) flow in horizontal tube with 19 mm diameter and 2000 mm length. Heat flux around tube is fixed at 5000W/m2, the range of Reynolds number is (3000–30,000) and volume concentrations are (1% and 2%). ANFIS model has three input data presented by Reynolds number, volume concentration of nanofluids and materials and two output presented predicting friction factor and Nusselt number in the tube. The simulation results of proposed algorithm have been compared with CFD simulator in which the mean relative errors (MRE) are 0.1232% and 0.1123 for friction factor and Nusselt number respectively. Finally, ANFIS models can predict hydrodynamics and heat transfer of the higher accuracy than the developed correlations.

      PubDate: 2016-06-15T20:39:30Z
      DOI: 10.1016/j.csite.2016.06.001
      Issue No: Vol. 8 (2016)
       
  • Performance of a clothes drying cabinet by utilizing waste heat from a
           split-type residential air conditioner

    • Authors: Himsar Ambarita; Abdul Halim Nasution; Nelson M. Siahaan; Hideki Kawai
      Pages: 105 - 114
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): Himsar Ambarita, Abdul Halim Nasution, Nelson M. Siahaan, Hideki Kawai
      In the present paper a study on the performance of clothes drying cabinet by utilizing waste heat from a split-type residential air-conditioner (RAC) has been carried out. A drying cabinet with a volume of 1m3 has been designed and fabricated. The waste heat from the condenser of the RAC with power of 800W was utilized as a heat source. In the experiments, the RAC was operated to keep a conditioned space at 20°C. The clothes dried made of pure cotton with initial weight varied 3.05kg, 5.25kg, 6.21kg, 8.22kg, and 10.22kg. Two different inlets, single inlet and multi-inlets, has been tested. The results show that the drying time varies from 80 to 410min. For single inlet the averaged drying time, optimum initial weight, optimum drying rate and optimum SMER was 242min, 6.21kg, 0.868kg/h, and 2.345kg/kWh. On the other hand, the drying chamber with multi-inlets the averaged drying time, optimum initial weight, optimum drying rate and optimum SMER was 222min, 8.22kg, 0.922kg/h, and 2.492kg/kWh. Thus, the present drying cabinet should be operated with multi-inlets and the initial weight varies from 6 to 8kg.

      PubDate: 2016-06-15T20:39:30Z
      DOI: 10.1016/j.csite.2016.06.002
      Issue No: Vol. 8 (2016)
       
  • Energy and exergy analysis of an aromatics plant

    • Authors: A.N. Vilarinho; J.B.L.M. Campos; C. Pinho
      Pages: 115 - 127
      Abstract: Publication date: Available online 9 June 2016
      Source:Case Studies in Thermal Engineering
      Author(s): A.N. Vilarinho, J.B.L.M. Campo, C. Pinho
      Energy and exergy balances were evaluated for the units that constitute the Aromatics plant of a refinery in Portugal (FAR): pre-distillation (Un-0100), Arosolvan (Un-0200), Parex (Un-0300), Isomar (Un-0400) and production of solvents (Un-0500). The FAR had an overall energy yield of 0.81% and an exergetic efficiency of 65.9%. The equipment with higher energy losses, were the condensers, representing 25.9% of the energy losses, followed by air coolers, with 15.4% of the energy losses. The furnaces were in third place with 14.7% of the energy losses. Most of the energy lost in FAR was due to the cooling process. The irreversibilities observed in the condensers and air coolers were equivalent to 1.61% and 0.86% of the total plant irreversibility. Furnaces represent 14.7% of energy losses, but stand out above the irreversibilities analysis with 14.5% of the total. This equipment presents a high potential of energetic and exergetic performance improving, with natural positive impact on energetic and exergetic performance in the FAR. The unaccounted thermal losses represented 32.9% which is mainly justified by the unknown mass flow rate of the gaseous effluent burned in the flare.

      PubDate: 2016-06-15T20:39:30Z
      DOI: 10.1016/j.csite.2016.06.003
      Issue No: Vol. 8 (2016)
       
  • Latent energy storage: Melting process around heating cylinders

    • Authors: T. Kousksou; M. Mahdaoui; M. Hlimi; R. El Alaiji; T. El Rhafiki
      Pages: 128 - 140
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): T. Kousksou, M. Mahdaoui, M. Hlimi, R. El Alaiji, T. El Rhafiki
      A physical model to investigate the melting process around a multiple of heating cylinders in the presence of the natural convection has been carried out. A numerical code is developed using an unstructured finite-volume method and an enthalpy porosity technique to solve for natural convection coupled to solid-liquid phase change. It is found that during the melting process around the cylinders, natural convection circulation around each cylinder interacts with the other cylinders to influence the melt shape. In addition to natural convection, the heat source arrangement is an important factor in determining the melt shape.

      PubDate: 2016-07-10T13:17:13Z
      DOI: 10.1016/j.csite.2016.06.010
      Issue No: Vol. 8 (2016)
       
  • Corrigendum to ‘Scrutiny of plasma spraying complexities with case study
           on the optimized conditions toward coating process control’ [CSITE 6C
           (2015) 171–181]

    • Authors: Ridha Djebali; Bernard Pateyron; Mohammed El Ganaoui
      First page: 141
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): Ridha Djebali, Bernard Pateyron, Mohammed El Ganaoui


      PubDate: 2016-07-10T13:17:13Z
      DOI: 10.1016/j.csite.2016.06.007
      Issue No: Vol. 8 (2016)
       
  • Exergetic analysis of building integrated semitransparent photovoltaic
           module in clear sky condition at Bhopal India

    • Authors: Akash Kumar Shukla; K. Sudhakar; Prashant Baredar
      Pages: 142 - 151
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): Akash Kumar Shukla, K. Sudhakar, Prashant Baredar
      In this research paper the energy, exergy and power generation of building integrated semitransparent photovoltaic (BISPV) modules for roof and facade has been evaluated. Solar radiation intensity on BISPV modules surfaces is an essential parameter for assessing energy and exergy. The experimental setup consists of two BISPV modules, each of 75W rating, which has been conducted on a clear sky day at roof and façade of Energy Centre building, MANIT Bhopal, India. It is observed that the energy efficiency varies between 11-18% at roof and 13-18% at facade throughout the day. The maximum value of electrical efficiency of BISPV module is 85% at roof and 72% at façade.

      PubDate: 2016-07-10T13:17:13Z
      DOI: 10.1016/j.csite.2016.06.009
      Issue No: Vol. 8 (2016)
       
  • Performance assessment of cooling systems in data centers; Methodology and
           application of a new thermal metric

    • Authors: Behzad Norouzi-Khangah; Mohammd Bagher Mohammadsadeghi-Azad; Seyed Morteza Hoseyni; Seyed Mohsen Hoseyni
      Pages: 152 - 163
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): Behzad Norouzi-Khangah, Mohammd Bagher Mohammadsadeghi-Azad, Seyed Morteza Hoseyni, Seyed Mohsen Hoseyni
      This paper introduces a comprehensive cooling index to assess performance of cooling systems in data centers and demonstrates its application on a real case by using CFD (computational fluid mechanics) method. The proposed methodology provides a metric for comparing and ranking of the cooling efficiency of the air distribution configurations among available designs alternatives.

      PubDate: 2016-07-10T13:17:13Z
      DOI: 10.1016/j.csite.2016.06.004
      Issue No: Vol. 8 (2016)
       
  • Thermal performance of two heat exchangers for thermoelectric generators

    • Authors: W. Li; M.C. Paul; J. Siviter; A Montecucco; A.R. Knox; T. Sweet; G. Min; H. Baig; T.K. Mallick; G. Han; D.H. Gregory; F. Azough; R. Freer
      Pages: 164 - 175
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): W. Li, M.C. Paul, J. Siviter, A Montecucco, A.R. Knox, T. Sweet, G. Min, H. Baig, T.K. Mallick, G. Han, D.H. Gregory, F. Azough, R. Freer
      The thermal performance of a heat exchanger is important for the potential application in an integrated solar cell/module and thermoelectric generator (TEG) system. Usually, the thermal performance of a heat exchanger for TEGs is analysed by using 1D heat conduction theory which ignores the detailed phenomena associated with thermo-hydraulics. In this paper, thermal and momentum transports in two different heat exchangers are simulated by means of a steady-state, 3D turbulent flow k - ε model with a heat conduction module under various flow rates. In order to simulate the actual working conditions of the heat exchangers, a hot block with an electric heater is included in the model. The TEG module is simplified by using a 1D heat conduction theory, so its thermal performance is equivalent to a real TEG. Natural convection effects on the outside surfaces of the computational domains are considered. Computational models and methods used are validated under transient thermal and electrical experimental conditions of a TEG. The two heat exchangers designed in this paper have better thermal performance than an existing heat exchanger for TEGs. More importantly, the fin heat exchanger is more compact and efficient than the tube heat exchanger.

      PubDate: 2016-07-10T13:17:13Z
      DOI: 10.1016/j.csite.2016.06.008
      Issue No: Vol. 8 (2016)
       
  • A linear Fresnel reflector as a solar system for heating water:
           theoretical and experimental study

    • Authors: Ghodbane Mokhtar; Boumeddane Boussad; Said Noureddine
      Pages: 176 - 186
      Abstract: Publication date: Available online 5 July 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Ghodbane Mokhtar, Boumeddane Boussad, Said Noureddine
      This work is concerned with assessing the thermal performances of a solar water heating system which is dependent on a linear Fresnel receiver (LFR) as a solar energy converter. The main objective of this paper is validation the experimental work carried out in the winter of 2015 on the concentrator in the climatic conditions of Algerian city “Blida” by a numerical simulation, where the tap water used as a heat carrier fluid. This simulation was used to solution of the energy balance equations of the absorber tubes and the water, where the solution is based on the finite difference method with an implicit scheme. After the solution of nonlinear equations, the program performed by using the MATLAB language gives the thermal efficiencies, the absorber temperatures, the water temperatures at the absorber tubes outlet, and thermal losses coefficients. The thermal efficiency of the reflector is exceeded 29%. The results obtained proved the existence of substantial convergence between the experimental and the numerical results, where in all cases the water temperature exceeded 347K.

      PubDate: 2016-07-10T13:17:13Z
      DOI: 10.1016/j.csite.2016.06.006
      Issue No: Vol. 8 (2016)
       
  • Heat transfer enhancement in solar air channel with broken multiple V-type
           baffle

    • Authors: Raj Kumar; Anil Kumar; Ranchan Chauhan; Muneesh Sethi
      Pages: 187 - 197
      Abstract: Publication date: Available online 7 July 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Raj Kumar, Anil Kumar, Ranchan Chauhan, Muneesh Sethi
      A current investigation deals with experimental analysis of the heat transfer behavior and optimum relative width parameter of the the solar air channel of aspect ratio of 10.0 with 60° angled broken multiple V-type baffles. The current experiment enclosed a wide range of parameter such as Reynolds number varied from 3000–8000, relative width varied from 1.0 to 6.0, relative baffle height of 0.5, relative baffle pitch of 10.0, relative discrete distance of 0.67 and relative gap width of 1.0. The obtained experimental results showed that higher overall thermal performance occurred at a relative baffle width of 5.0. Also, the results reveal that the broken multiple V-type baffles are thermo-hydraulically superior as compared to the other baffles shaped solar air channel.

      PubDate: 2016-07-10T13:17:13Z
      DOI: 10.1016/j.csite.2016.07.001
      Issue No: Vol. 8 (2016)
       
  • Application of Nanofluids for the Optimal Design of Shell and Tube Heat
           Exchangers Using Genetic Algorithm

    • Authors: Abazar Vahdat Azad; Nader Vahdat Azad
      Pages: 198 - 206
      Abstract: Publication date: Available online 26 July 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Abazar Vahdat Azad, Nader Vahdat Azad
      Optimization of shell and tube heat exchangers in industrial processes has always been a major goal for engineers and designers. The aim of the present study is to investigate application of alumina nanofluid to enhance the efficiency of heat exchangers while reducing energy consumption and overall cost. Alumina nanofluid increases the Nusselt number and thereby increases the heat transfer coefficient of shell and tube heat exchangers. Increased heat transfer coefficients reduce the required tube length leading to reduced pressure drop in the heat exchanger. In the case studied in this paper, over 185% increase in tube side heat transfer coefficient allows reduction of heat exchanger length and flow velocity and thereby reduction of pressure drop up to 94%. Consequently, the overall cost of the heat exchanger reduced more than 55%. Given the important results obtained from the use of nanofluid to enhance the efficiency of heat exchangers, the use of this technology is proposed as an efficient and practical method for the design of shell and tube heat exchangers.

      PubDate: 2016-07-28T23:02:57Z
      DOI: 10.1016/j.csite.2016.07.004
      Issue No: Vol. 8 (2016)
       
  • Exergy analysis and optimization of a high temperature proton exchange
           membrane fuel cell using genetic algorithm

    • Authors: Maryam Haghighi; Fatemeh Sharifhassan
      Pages: 207 - 217
      Abstract: Publication date: Available online 30 July 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Maryam Haghighi, Fatemeh Sharifhassan
      The exergy of a high temperature proton exchange membrane fuel cell has been studied and analyzed in this research. In the present work a genetic algorithm code was developed using MATLAB software to calculate and optimize work, exergy, exergy efficiency and thermodynamic irreversibility. Also, a membrane fuel cell was modeled and simulated. The polarization curve is in good agreement with experimental data. The results were studied for current density range= 0.05A/cm2 to 1A/cm2, temperature range=393K to 453K, pressure range=1atm to 3atm and membrane thickness=0.016 cm-0.02cm. The optimum value of work was calculated 0.496W/cm2that was obtained at current density of 1A/cm2, temperature=453K, pressure=2.6atm and membrane thickness=0.016cm. The optimum value for irreversibility and exergy efficiency are0.007W/cm2and 0.46 at the same point.The optimum point of multi-objective function was obtained at current density 0.49363A/cm2, temperature 451.231K, pressure 2.5atm and membrane thickness 0.016cm. At this optimum point work, irreversibility and exergy efficiency were calculated as 0.2767W/cm2, 0.1542W/cm2 and 0.3545 simultaneously.

      PubDate: 2016-08-03T19:39:13Z
      DOI: 10.1016/j.csite.2016.07.005
      Issue No: Vol. 8 (2016)
       
  • Effects of surface tension and wood surface roughness on impact splash of
           a pure and multi-component water drop

    • Authors: Meijuan Lan; Xishi Wang; Pingping Chen; Xiangdi Zhao
      Pages: 218 - 225
      Abstract: Publication date: Available online 1 August 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Meijuan Lan, Xishi Wang, Pingping Chen, Xiangdi Zhao
      Concerning the deeper understanding of the mechanisms on fire suppression with multi-component water mist/spray, the dynamical process of a water drop with or without additives impacting upon wood surfaces is preliminarily studied. The initial diameters of the pure water drop and the water drop with NaCl additive are about 2.4±0.1 mm, and the diameter of the water drop with AFFF (Aqueous Film-Forming Foam) additive is about 1.8±0.1 mm. The drop impact velocities are varied from 1.13m/s to 2.80m/s. A Photorn FASTCAM high-speed video camera coupled with a Nikon 200 mm micro-lens is used to record the dynamical process of the drop impacting. The results show that the critical impact Weber number of the water drop with additives is obviously larger than that without additives, and the critical impact Weber number increases with decrease of the wood surface roughness. In addition, the current empirical models both on predicting the critical Weber number and the maximum spread factor just partially agree with the experimental results. The current results are limited to the interaction of a single water drop impacting upon a horizontal wood surface.

      PubDate: 2016-08-03T19:39:13Z
      DOI: 10.1016/j.csite.2016.07.006
      Issue No: Vol. 8 (2016)
       
  • Numerical investigation on turbulent forced convection and heat transfer
           characteristic in a square channel with discrete combined V-baffle and
           V-orifice

    • Authors: Amnart Boonloi; Withada Jedsadaratanachai
      Pages: 226 - 235
      Abstract: Publication date: Available online 12 July 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Amnart Boonloi, Withada Jedsadaratanachai
      Turbulent forced convection, heat transfer and performance improvement in a square channel with discrete combined baffles (DCB), which combined V-baffle and V-orifice, are investigated numerically. The influences of the flow blockage ratios (BR = 0.05, 0.10 and 0.15) and V-tip directions (V-tip pointing downstream called “V-Downstream” and V-tip pointing upstream called “V-Upstream”) are examined with a single pitch spacing ratio, PR = 1, and attack angle, α = 30o, for the Reynolds number, Re = 5000 – 20,000. The computation results are reported in terms of flow visualizations, heat transfer characteristics, performance assessments. The results are compared with the smooth channel and the previous works. As the results, the DCB enhances the heat transfer rate and thermal efficiency due to the disturbance of the thermal boundary layer. The improvement of the heat transfer rate is around 2.8 – 6 times higher than the smooth channel depended on BR, V-tip directions and Re. In addition, the computational result reveals that the optimum thermal enhancement factor, TEF, is around 1.72 at BR = 0.1, Re = 3000 and V-Upstream.

      PubDate: 2016-07-15T18:13:44Z
      DOI: 10.1016/j.csite.2016.07.003
      Issue No: Vol. 8 (2016)
       
  • Performance and Emission Characteristics of a Transportation Diesel Engine
           operated with Non-Edible Vegetable oils Biodiesel

    • Authors: Ashok Kumar Yadav; Mohd Emran Khan; Alok Manas Dubey; Amit Pal
      Pages: 236 - 244
      Abstract: Publication date: Available online 2 August 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Ashok Kumar Yadav, Mohd Emran Khan, Alok Manas Dubey, Amit Pal
      In this study, production, performance and emission characteristics of methyl esters of Oleander, Kusum and Bitter Groundnut oil in a transportation diesel engine were studied. Oleander oil methyl esters (OOME), Kusum oil methyl esters (KOME), and bitter Groundnut Oil Methyl Esters (BGOME) were prepared by transesterification process. The effects of three methyl esters on engine performance and exhaust emissions were examined at different engine speed and full load condition. Experimental results showed that the brake thermal efficiency of OOME is found higher and brake specific fuel consumption lower compared to KOME and BGOME. BGOME shows less emissions compared to OOME and KOME. In short, it may be concluded from the experimental investigations that biodiesel from different non-edible oils (Oleander, Kusum, and Bitter Groundnut) can become an alternative source of fuel in the future.

      PubDate: 2016-08-03T19:39:13Z
      DOI: 10.1016/j.csite.2016.08.001
      Issue No: Vol. 8 (2016)
       
  • Effects of heated ethanol on retrofit single-hole gasoline injector
           performance

    • Authors: Sathaporn Chuepeng
      Pages: 245 - 249
      Abstract: Publication date: Available online 21 August 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Sathaporn Chuepeng
      The main aim of this work is to explore the injector performance in terms of fuel mass flow rate and discharge coefficient when ethanol is in use with gasoline injectors at elevated temperatures. The operating fuel injection was at the pressures between 0.2 and 0.4MPa and the temperatures in a range of 40 to 80οC. A fuel injector test cell with electronic control for injection pulse, timing and pressure was set to 120Hz and 60min injection duration to drive three single-hole 0.34-mm nozzle diameter injectors. The fuels were injected into a known volume flask at quiescence atmospheric pressure and weighed to attain the fuel mass flow rates. By this manner, the discharge coefficient can be calculated by the assumptions of quasi steady, incompressible, and one dimensional flow through each injector. When operating at 40οC injection temperature, ethanol delivered greater fuel amounts than gasoline resulting in higher discharge coefficients. Additionally, the discharge coefficients declined with the increment of pressure drop. The temperatures of the injected fuels are shown to affect the fuel flow rates and the discharge coefficients.

      PubDate: 2016-08-24T14:11:50Z
      DOI: 10.1016/j.csite.2016.08.003
      Issue No: Vol. 8 (2016)
       
  • Study on TBCs insulation characteristics of a turbine blade under serving
           conditions

    • Authors: J.H. Liu; Y.B. Liu; X. He; L. Liu
      Pages: 250 - 259
      Abstract: Publication date: Available online 26 August 2016
      Source:Case Studies in Thermal Engineering
      Author(s): J.H. Liu, Y.B. Liu, X. He, L. Liu
      It is a key problem to study thermal barrier coatings (TBCs) insulation and followed stresses for the coated blade. This article focused on the insulation characteristics of TBCs by coupling heat transfer and flow with a multilayer blade. We found that the coated blade can benefit more in the decline of average temperature than the decline of maximum temperature, compared to the uncoated case. Temperature fluctuation on TBCs surface is evident. The inlet temperature of main flow (T in) more than the heat transfer coefficient of cooling passages (h cool) impacted the fluctuation. And there is a non-homogeneous distribution of the temperature decline (ΔT) across the coatings around the blade. At the suction side and the head, ΔT was generally higher than that of the pressure side and the tail. The TBCs thickness and T in can affect ΔT more than h cool. We suggest that in the sequential TBCs stresses simulation the actual temperature distribution should be prescribed.
      Graphical abstract image

      PubDate: 2016-08-29T15:45:05Z
      DOI: 10.1016/j.csite.2016.08.004
      Issue No: Vol. 8 (2016)
       
  • Performance evaluation of gauze packing for liquid desiccant
           dehumidification system

    • Authors: A.S.A. Mohamed; M.S. Ahmed; A.A.M. Hassan; M. Salah Hassan
      Pages: 260 - 276
      Abstract: Publication date: September 2016
      Source:Case Studies in Thermal Engineering, Volume 8
      Author(s): A.S.A. Mohamed, M.S. Ahmed, A.A.M. Hassan, M. Salah Hassan
      Desiccant systems have found applications in a very large variety of industrial and daily usage products including the new HVAC installations. The dehumidifier is one of the essential parts of those systems, which severely affects the whole system performance. This paper theoretically and experimentally studies the performance of the cross flow dehumidifier, which has been less studied than the counter flow dehumidifier, although it is more applicable in practice. Channel gauze structured packing was used in the dehumidifier and a LiCl aqueous solution was used as the liquid desiccant. The humidity reduction and dehumidifier effectiveness were adopted as the dehumidifier performance indices. The effects of the dehumidifier inlet parameters, including inlet air and desiccant flow rates, inlet air and desiccant temperature, inlet desiccant concentration and inlet air humidity ratio, on the two indices were investigated. The characteristics of the dehumidifier performance agreed well with the other studies reported in the open literature.

      PubDate: 2016-09-03T23:03:20Z
      DOI: 10.1016/j.csite.2016.08.005
      Issue No: Vol. 8 (2016)
       
  • The Influence of Turbulence Models On the Accuracy of CFD Analysis of a
           Reciprocating Mechanism Driven Heat Loop

    • Authors: Olubunmi Popoola; Yiding Cao
      Pages: 277 - 290
      Abstract: Publication date: Available online 31 August 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Olubunmi Popoola, Yiding Cao
      A bellows-type Reciprocating-Mechanism Driven Heat Loops (RMDHL) is a novel heat transfer device that could attain a high heat transfer rate through a reciprocating flow of the working fluid inside the heat transfer device. Although the device has been tested and validated experimentally, analytical or numerical study has not been undertaken to understand its working mechanism and provide guidance for the device design. In an effort to improve earlier numerical models of the RMDHL, different turbulence models for the RMDHL design have been studied and compared with prior experimental results to select the most suitable turbulence modeling techniques. The governing equations have been numerically solved using a CFD solver. For the three-dimensional fluid flow, several turbulence models have been studied for the RMDHL, including Standard, RNG, and Realizable k-ɛ Models, Standard and SST k-ω Models, Transition k - k L -ω Model and the Transition SST Model. The results of the simulations have been analyzed and ranked using numerical model calibration template. It was found that the standard k-ω Models provided the least accurate results while the RNG-k-ɛ Model provided the most accurate predictions. It is expected that the results will help improve the accuracy of the work on the RMDHL modeling.

      PubDate: 2016-09-03T23:03:20Z
      DOI: 10.1016/j.csite.2016.08.009
      Issue No: Vol. 8 (2016)
       
  • Thermal analysis of holes created on ceramic coating for diesel engine
           piston

    • Authors: Ravindra Gehlot; Brajesh Tripathi
      Pages: 291 - 299
      Abstract: Publication date: Available online 31 August 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Ravindra Gehlot, Brajesh Tripathi
      This paper deals with the steady state thermal analysis of diesel engine piston coated with ceramic coating having holes on its surface. Temperature distribution on the piston's top surface and substrate surface is investigated by using finite element based software called Ansys. Yttria-stabilized Zirconia is used as ceramic coating applied on Al-Si piston crown. The thickness of ceramic top coating is about 0.4 mm and for NiCrAl bond coat it is taken to be 0.1 mm. Temperature distribution is investigated by choosing various radiuses of holes created on the ceramic coating surface about 1.5 mm, 2 mm and 2.5 mm. From the results it is observed that the top surface (coated surface) temperature is increasing with increase the radius of the holes. Maximum temperature of coated surface is occurs for highest hole radius of about 2.5 mm. Compared with coating have no hole, a significant increase in the pistons top surface temperature occurs with coating having holes. Although, the substrate temperature is decreasing with increase the radius of the holes.

      PubDate: 2016-09-03T23:03:20Z
      DOI: 10.1016/j.csite.2016.08.008
      Issue No: Vol. 8 (2016)
       
  • Optimal control of batch cooling crystallizers by using genetic algorithm

    • Authors: Younes Amini; M. Barzegar Gerdroodbary; Mahmoud Reza Pishvaie; Rasoul Moradi; S. Mahruz Monfared
      Pages: 300 - 310
      Abstract: Publication date: Available online 3 September 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Younes Amini, M. Barzegar Gerdroodbary, Mahmoud Reza Pishvaie, Rasoul Moradi, S. Mahruz Monfared
      The formation of crystals from solutions plays a key role in various industrial applications. In this study, a new approach is presented into the optimal control of batch cooling crystallizers through a genetic algorithm. The Population balance is formularized for a typical batch crystallizer. The objective functions considered here are related to quality of products at the end of the batch. These functions are objective function of maximum mean weight size, closeness to the specified value and minimum coefficient of variation. By using an optimization algorithm (genetic algorithm), the minimum and maximum values of the objective function the input temperature parameter are obtained. The obtained results show that various trajectories can be used for cooling batch crystallizer based on objective functions. This method is applied for the potassium-nitrate system.

      PubDate: 2016-09-03T23:03:20Z
      DOI: 10.1016/j.csite.2016.09.001
      Issue No: Vol. 8 (2016)
       
  • Numerical case study of packed sphere wicked heat pipe using Al2O3 and CuO
           based water nanofluid

    • Authors: Taoufik Brahim; Abdelmajid Jemni
      Pages: 311 - 321
      Abstract: Publication date: Available online 16 September 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Taoufik Brahim, Abdelmajid Jemni
      Nanofluids have been receiving increased attention worldwide and various research groups have tried to engage it within heat pipes systems to study the subsequent thermal enhancement. The observations based on the reviewed literature showed that the theoretical investigations on nanofluids in heat pipes are very few and hence validating the experimental findings is difficult. In this paper, a two-dimensional numerical model is developed to study the thermal performance of a packed sphere heat pipe utilizing nanofluids due to the recent development of nanofluids and porous media structures. Two of the most common nanoparticles, namely Al2O3 and CuO based water are considered. The substantial change in the heat pipe thermal resistance, liquid pressure, axial and radial velocities profiles in presence of suspended nanoparticles within the base fluid are discussed. The effect of particle size on the thermal performance of the heat pipe is also investigated. Results showed that Al2O3 nanofluid slightly outperformed CuO nanofluid heat pipes especially with decreasing nanofluid particle diameter. It was found that reduction of 68% on thermal resistance can be obtained for 9% CuO nanofluid concentration level which trend to reach 20% without significant shear stress effect. Nanofluid based heat pipe is able to dissipate up to 26% more heat without experiencing an increase in the wall temperature and an optimal nanofluid concentration level and diameter are found to better heat pipe performance.

      PubDate: 2016-09-18T07:08:17Z
      DOI: 10.1016/j.csite.2016.09.002
      Issue No: Vol. 8 (2016)
       
  • Natural convection in circular enclosures heated from below for various
           central angles

    • Authors: Seyed Milad Mirabedin; Fatola Farhadi
      Pages: 322 - 329
      Abstract: Publication date: Available online 29 August 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Seyed Milad Mirabedin, Fatola Farhadi
      Two-dimensional numerical simulations have been performed to study natural convection in circular enclosures filled with water considering different central angles. Continuity, momentum and energy equations are solved assuming Boussinesq approximation utilizing COMSOL. Effect of Rayleigh number, Ra, on heat transfer rate is investigated by showing Nusselt number, Nu, for a range from 1 × 10 3 to 1 × 10 7 . It is shown that decreasing central angle of the cavity increases averaged Nusselt number in a cavity heated from below. Finally, a correlation for heat transfer rate is developed considering the effect of the angle between two sides of the cavity and Ra number using simulation results.

      PubDate: 2016-09-03T23:03:20Z
      DOI: 10.1016/j.csite.2016.08.007
      Issue No: Vol. 8 (2016)
       
  • Investigation of exergy efficiency in shell and helically coiled tube heat
           exchangers

    • Authors: Ashkan Alimoradi; Farzad Veysi
      Pages: 196 - 208
      Abstract: Publication date: Available online 16 December 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Ashkan Alimoradi
      This study presents exergy analysis for forced convection heat transfer in shell and helically coiled tube heat exchangers. The effect of operational and geometrical parameters on the exergy efficiency was investigated. Water is selected as the working fluid of both sides. Results show that, the efficiency decreases linearly with the increase of the fluids dimensionless inlet temperature difference. Based on the results, a correlation was developed to predict the efficiency for wide range of mass flow rates ratio (0.1<Rm<4), fluids dimensionless inlet temperature difference (0<RT<0.8), product of Reynolds numbers (3.31E+8< (Rec.Resh)<1.32E+9) and dimensionless geometrical parameters. According to this equation it was found that, the coil which has the maximum number of turns and minimum diameter is more efficient than other coils which have the same length.

      PubDate: 2016-12-16T18:16:41Z
      DOI: 10.1016/j.ijthermalsci.2016.04.010
      Issue No: Vol. 107 (2016)
       
  • Numerical Study on Turbulent Forced Convective Heat Transfer Using
           Nanofluids TiO2 in an Automotive Cooling System

    • Authors: Adnan M. Hussein; H.K. Dawood; R.A. Bakara; K. Kadirgamaa
      Abstract: Publication date: Available online 9 December 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Adnan M. Hussein, H.K. Dawood, R.A. Bakara, K. Kadirgamaa
      The limited thermal properties of liquids have led to the addition of solid nanoparticles to liquids in many industrial applications. In this paper, the friction factor and forced convection heat transfer of TiO2 nanoparticles dispersed in water in a car radiator was numerically determined. Four different nanofluid volume concentrations (1, 2, 3 and 4%) were used, and the resulting thermal properties were evaluated. The Reynolds number and inlet temperature ranged from 10000 to 100000 and from 60 to 90°C, respectively. The results showed that the friction factor decreases as the Reynolds number increases and increases as the volume concentration increases. Additionally, the Nusselt number increases as the Reynolds number and volume concentration of the nanofluid increases. The TiO2 nanofluid at low concentrations can enhance the heat transfer efficiency up to 20% compared with that of pure water. There was good agreement among the CFD analysis and experimental data available in the literature.

      PubDate: 2016-12-09T18:11:41Z
      DOI: 10.1016/j.csite.2016.11.005
       
  • Experimental Performance of LPG Refrigerant Charges with varied
           Concentration of TiO2 Nano-Lubricants in a Domestic Refrigerator

    • Authors: Damola S. Adelekan; Olayinka S. Ohunakin; Taiwo O. Babarinde; Moradeyo K. Odunfa; Richard O. Leramo; Sunday O. Oyedepo; Damilola C. Badejo
      Abstract: Publication date: Available online 9 December 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Damola S. Adelekan, Olayinka S. Ohunakin, Taiwo O. Babarinde, Moradeyo K. Odunfa, Richard O. Leramo, Sunday O. Oyedepo, Damilola C. Badejo
      This article present an experimental investigation of varied mass charges of Liquefied Petroleum Gas (40g, 50g, 60g and 70g) enhanced with varied TiO2 nanoparticle/mineral oil concentrations (0.2g/L, 0.4g/L and 0.6g/L nano-lubricants) in a R134a compressor of a domestic refrigerator. Performance tests investigated at steady state included: pull down time, power consumption, compressor power input, cooling capacity and coefficient of performance (COP). Analysis was based on temperature and pressure readings obtained from appropriate gauges attached to the test rig. Refrigerant property characteristics were obtained using Ref-Prop NIST 9.0 software. Results obtained showed almost equal evaporator air temperatures and reduction in power consumption for all tested nano-lubricant concentrations except at 70g charge of LPG using 0.6g/L nano-lubricant. Furthermore, the lowest compressor power input was found to be 21W and obtained using 70g of LPG with either of 0.2g/L or 0.4g/L nano-lubricants. At 70g of LPG using 0.6g/L concentration of nano-lubricant, highest cooling capacity index of 65W was obtained while the highest COP of 2.8 was obtained with 40g charge of LPG using 0.4g/L concentration of nanolubricant. In conclusion, LPG-TiO2 nano-lubricant mixture works safely and efficiently in domestic refrigerators without modification of capillary tube length, but requires adequate optimization.

      PubDate: 2016-12-09T18:11:41Z
      DOI: 10.1016/j.csite.2016.12.002
       
  • Effect of inclination angle on the melting process of phase change
           material

    • Authors: H. Zennouhi; W. Benomar; T. Kousksou; A. Ait Msaad; A. Allouhi; T. El Rhafiki
      Abstract: Publication date: Available online 29 November 2016
      Source:Case Studies in Thermal Engineering
      Author(s): H. Zennouhi, W. Benomar, T. Kousksou, A. Ait Msaad, A. Allouhi, T. El Rhafiki
      A two-dimensional numerical simulation of the melting process in a rectangular enclosure for different inclination angles, has been carried out. Galium as a phase change material (PCM) with low Prandtl number is used. A numerical code is developed using an unstructured mesh, finite-volume method and an enthalpy porosity technique to solve for natural convection coupled to solid-liquid phase change. The validity of the numerical code used is ascertained by comparing our results with previously published results. The effect of the inclination angle on the flow structure and heat transfer characteristics is investigated in detail. It is found that the melting rate inside the rectangular cavity increases by decreasing the inclination angle from 90° to 0°.

      PubDate: 2016-12-02T17:42:22Z
      DOI: 10.1016/j.csite.2016.11.004
       
  • COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF SPONGE IRON ROTARY KILN

    • Authors: Gajendra Kumar; Gaurav Shabina Khanam
      Abstract: Publication date: Available online 20 November 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Gajendra Kumar Gaurav, Shabina Khanam
      2D CFD model of rotary kiln of sponge iron process is developed to study the effects of angle of inclination, number of rotation and mass flow rate of iron ore on output parameters. Based on grid independent test for temperature profile optimum mesh size is selected. The result shows that optimum angle of inclination, number of rotation and flow rate of iron ore are found as 2.7 degree, 4.8rpm and 10kg/s, respectively. At these optimum conditions the % metallization is predicted as 89.5%, which is 3.24% less in comparison to the existing system. The temperature profiles of gas and bed are also found within acceptable temperature limits. The results are compared well with the published work as well as industrial data.
      Graphical abstract image

      PubDate: 2016-11-25T02:00:52Z
       
  • Energy and parametric analysis of solar absorption cooling systems in
           various Moroccan climates

    • Authors: Y. Agrouaz; T. Bouhal; A. Allouhi; T. Kousksou; A. Jamil; Y. Zeraouli
      Abstract: Publication date: Available online 12 November 2016
      Source:Case Studies in Thermal Engineering
      Author(s): Y. Agrouaz, T. Bouhal, A. Allouhi, T. Kousksou, A. Jamil, Y. Zeraouli
      The aim of this work is to investigate the energetic performance of a solar cooling system using absorption technology under Moroccan climate. The solar fraction and the coefficient of performance of the solar cooling system were evaluated for various climatic conditions. It is found that the system operating in Errachidia shows the best average annual solar fraction (of 30%) and COP (of 0.33) owing to the high solar capabilities of this region. Solar fraction values in other regions varied between 19% and 23%. Moreover, the coefficient of performance values shows in the same regions a significant variation from 0.12 to 0.33 all over the year. A detailed parametric study was as well carried out to evidence the effect of the operating and design parameters on the solar air conditioner performance.

      PubDate: 2016-11-18T01:56:26Z
      DOI: 10.1016/j.csite.2016.11.002
       
 
 
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