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ENGINEERING (1199 journals)                  1 2 3 4 5 6 | 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: 15)
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: 218)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
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: 5)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
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: 19)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
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: 12)
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: 35)
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   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 27)
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: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 8)
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: 7)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
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: 7)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
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: 8)
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: 23)
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: 9)
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: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
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: 13)
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: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
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: 3)
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: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
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: 6)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 178)
Composites Part B : Engineering     Hybrid Journal   (Followers: 223)
Composites Science and Technology     Hybrid Journal   (Followers: 164)
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: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 41)
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  

        1 2 3 4 5 6 | Last

Journal Cover Case Studies in Thermal Engineering
  [SJR: 0.966]   [H-I: 7]   [3 followers]  Follow
  This is an Open Access Journal Open Access journal
   ISSN (Online) 2214-157X
   Published by Elsevier Homepage  [3031 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)
  • Experimental performance investigation of minichannel water
           cooled-thermoelectric refrigerator

    • Authors: Murat Gökçek; Fatih Şahin
      Pages: 54 - 62
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Murat Gökçek, Fatih Şahin
      An experimental performance analysis of minichannel water cooled-thermoelectric refrigerator in this study is presented. The cooling system of refrigerator is consists of two thermoelectric modules integrated with the minichannel heat sinks in its hot side and the heat dissipaters in its cold side. The experiments carried out for different system voltages and different flow rates of cooling water in the minichannel. The results show that the inner temperature of water cooled-thermoelectric refrigerator is about 2°C for 0.8L/min flow rate while it is about −0.1°C for 1.5L/min flow rate at the end of 2-h experiment. COP value of thermoelectric refrigerator is 0.23 in the flow rate 1.5L/min while COP is 0.19 in the flow rate 0.8L/min at the end of 25min cooling times. When it comes to 8V system voltages, COP of the thermoelectric refrigerator is about 0.41 at the end of 25min operating period for the flow rate 1.5L/min. This study concludes that the performance of minichannel heat sink used in this study has as good as other liquid water cooled systems used to absorb heat from thermoelectric modules hot side.

      PubDate: 2017-03-27T16:40:11Z
      DOI: 10.1016/j.csite.2017.03.004
      Issue No: Vol. 10 (2017)
  • Effect of the thermal insulation layer location on wall dynamic thermal
           response rate under the air-conditioning intermittent operation

    • Authors: Lili Zhang; Tao Luo; Xi Meng; Yating Wang; Chaoping Hou; Enshen Long
      Pages: 79 - 85
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Lili Zhang, Tao Luo, Xi Meng, Yating Wang, Chaoping Hou, Enshen Long
      Although the air-conditioning intermittent operation is widely used in buildings, more attention is focused on the air-conditioning continuous operation in the whole building to simplify energy conservation design, and thereby, the operation method inconsistence of air-conditioning must lead to the large difference between actual value and design value of energy consumption. According to this situation, in order to explore the wall energy conservation difference under the continuous and intermittent operation of air-conditioning, a experiment is built to analyze the effect of the thermal insulation layer location on wall dynamic thermal response rate. Experimental result shows that under the air-conditioning intermittent operation, wall cold storage is the main source of air-conditioning load formed by walls and the wall internal layer has the significant effect on the wall dynamic thermal response performance. And the closer to wall inner surface for the thermal insulation layer, the lower the inner surface temperature and the higher the wall thermal response rate. Meanwhile, the internal thermal insulation wall has the smallest heat flow value, which is less 35–86% than external thermal insulation wall and the sandwich thermal insulation wall, although they have the same heat transfer coefficients.

      PubDate: 2017-04-11T18:44:37Z
      DOI: 10.1016/j.csite.2017.04.001
      Issue No: Vol. 10 (2017)
  • Analysis on the cooling water system operation under the first time test
           of 40Tesla hybrid magnet

    • Authors: J.L. Tang; Z.R. OuYang
      Pages: 95 - 99
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): J.L. Tang, Z.R. OuYang
      The hybrid magnet of the High Magnetic Field Laboratory has reached its premier goal of 40 T. A detailed analysis has been carried on the cooling water system for insert resistive magnet, and about the de-ionized water quality, the time for purification and the operation parameters. Some phenomena and problems during the resistive magnet excitation have been analyzed. The de-ionized water resistivity presents a continuous declination trend. The flow rate of the de-ionized water and the heat load in both sides of the heat exchanger is imbalance. Some possible reasons were given. The further improvement methods and measures to some problems of the system have been proposed.

      PubDate: 2017-05-12T18:01:52Z
      DOI: 10.1016/j.csite.2017.05.004
      Issue No: Vol. 10 (2017)
  • Numerical study of three-dimensional natural convection and entropy
           generation in a cubical cavity with partially active vertical walls

    • Authors: Abdullah A.A.A Al-Rashed; Lioua Kolsi; Ahmed Kadhim Hussein; Walid Hassen; Mohamed Aichouni; Mohamed Naceur Borjini
      Pages: 100 - 110
      Abstract: Publication date: September 2017
      Source:Case Studies in Thermal Engineering, Volume 10
      Author(s): Abdullah A.A.A Al-Rashed, Lioua Kolsi, Ahmed Kadhim Hussein, Walid Hassen, Mohamed Aichouni, Mohamed Naceur Borjini
      Natural convection and entropy generation due to the heat transfer and fluid friction irreversibilities in a three-dimensional cubical cavity with partially heated and cooled vertical walls has been investigated numerically using the finite volume method. Four different arrangements of partially active vertical sidewalls of the cubical cavity are considered. Numerical calculations are carried out for Rayleigh numbers from (103 ≤ Ra ≤ 106), various locations of the partial heating and cooling vertical sidewalls, while the Prandtl number of air is considered constant as Pr=0.7) and the irreversibility coefficient is taken as ( φ = 10 − 4 ). The results explain that the total entropy generation rate increases when the Rayleigh number increases. While, the Bejan number decreases as the Rayleigh number increases. Also, it is found that the arrangements of heating and cooling regions have a significant effect on the fluid flow and heat transfer characteristics of natural convection and entropy generation in a cubical cavity. The Middle-Middle arrangement produces higher values of average Nusselt numbers.

      PubDate: 2017-05-12T18:01:52Z
      DOI: 10.1016/j.csite.2017.05.003
      Issue No: Vol. 10 (2017)
  • Experimental Study of Flow through Compressor Cascade

    • Authors: Satyam Panchal; Vijay Mayavanshi
      Abstract: Publication date: Available online 9 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Satyam Panchal, Vijay Mayavanshi
      The objective of this research work is to study the behaviour of flow at the inlet, within the blade passage and at the exit of a compressor cascade. For this purpose, a cascade with six numbers of aerofoil blades was designed and constructed. The cascade was fitted on the cascade test tunnel. Out of six blades two were instrumented for measuring the pressure distribution on the pressure and suction surface. The blades had a parabolic camber line, with a maximum camber position at 40% of the chord from the leading edge of the blade. The profile of the blade was C4, height of the blade was 160 mm, chord length was 80 mm, camber angle was 450 and stagger angle was 300. Similarly, the length of the cascade was 300 mm, span was 160 mm, pitch was 60 mm, the actual chord of the cascade was 80 mm, the axial chord of the cascade was 70 mm, the stagger angle of the cascade was 300 and the pitch-chord ratio was 0.75. The data was taken and analyzed at −500% of the axial chord before the cascade, −25% of the axial chord before the leading edge, 25%, 50%, 75% and 150% of the axial chord from the leading edge of the blade. The readings were taken from the cascade wall to the mid span position along the pitch wise direction. The angle of incidence was also changed during the experiment and varied from i= −500, −300, −100 to 50.

      PubDate: 2017-05-12T18:01:52Z
      DOI: 10.1016/j.csite.2017.05.002

    • Authors: Gautam Edara; Y.V.V.S.N. Murthy; K.V. Sharma; Sunitaho Pullela
      Abstract: Publication date: Available online 4 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Gautam Edara, Y.V.V.S.N. Murthy, K.V. Sharma, Sunitaho Pullela
      An analytical method is proposed to estimate the ignition time of the fuel droplet injected in to the combustion chamber of an I.C. engine. The first phase of analysis related to the case of thermal conservation to raise its temperature up to the ignition temperature with non-vaporization from its spherical surface. The ignition temperature depends on the fuel characteristics like specific heat, density, vapor pressure, thermal conductivity, latent heat etc. Subsequently, the mass diffusion of the vapors is included in the investigation. The non –dimensional parameter Fourier number Fo is associated with mass diffusion of vapor from the spherical surface π m , the convective heat transfer π h and the thermal radiation π ε from the compressed medium are observed to be the significant criteria in determining the ignition time. For a range of parameters analyzed the ignition time is observed to be a fraction of second. The results show that the term dimensionless radius R + decreases with increase in Fourier number. Further a correlation is established between the non-dimensional numbers Fourier number and π m , π h , π ε T i g + , R + of the droplet to predict the ignition time is proposed based on the physical configuration of the droplet.

      PubDate: 2017-05-08T17:43:12Z
      DOI: 10.1016/j.csite.2017.05.001
  • Performance Analysis of Solar Air Heater with Jet Impingement on
           Corrugated Absorber Plate

    • Authors: Alsanossi M. Aboghrara; B.T.H.T Baharudin; M.A. Alghoul; Nor Mariah Adam; Abdul Aziz Hairuddin; Husam A. Hasan
      Abstract: Publication date: Available online 4 May 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Alsanossi M. Aboghrara, B.T.H.T Baharudin, M.A. Alghoul, Nor Mariah Adam, Abdul Aziz Hairuddin, Husam A. Hasan
      This paper deals with the experimental investigation outlet temperature and efficiency, of Solar Air heater(SAH). The experimental test set up designed and fabricated to study the effect of jet impingement on the corrugated absorber plate, through circular jets in a duct flow of solar air heater, and compared with conventional solar air heater on flat plat absorber.. Under effect of mass flow rate ( m ̇ ) of air and solar radiation on outlet air temperature, and efficiency, are analyzed. Results show the flow jet impingement on corrugated plat absorber is a strong function of heat transfer enhancement. The present investigation concludes that the mass flow rate of air substantially influences the heat transfer on solar air heaters. And the thermal efficiency of proposed design duct is observed almost 14% more as compare to the smooth duct. At solar radiation 500–1000 (W/M2), 308K ambient temperature and 0.01–0.03(Kg/S) mass flow rate

      PubDate: 2017-05-08T17:43:12Z
      DOI: 10.1016/j.csite.2017.04.002
  • Investigation of baffle configuration effect on the performance of exhaust

    • Authors: Ahmed Elsayed; Christophe Bastien; Steve Jones; Jesper Christensen; Humberto Medina; Hassan Kassem
      Abstract: Publication date: Available online 28 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Ahmed Elsayed, Christophe Bastien, Steve Jones, Jesper Christensen, Humberto Medina, Hassan Kassem
      Using baffles in exhaust mufflers is known to improve their transmission loss. The baffle cut ratio should affect the muffler performance analogous to a shell-and-tube heat exchanger. To the authors’ knowledge, there is no previous assessment reported in literature of the effects that the baffle cut ratio configuration has on acoustic response and back pressure. This investigation presents a parametric study on the effect of baffle configuration on transmission loss and pressure drop predicted. The effect of (i) the baffle cut ratio and baffle spacing, (ii) the number of baffle holes, and (iii) the hole distribution for their effect on transmission loss was investigated. Results show that decreasing the baffle cut ratio tends to increase the transmission loss at intermediate frequencies by up to 45%. Decreasing the spacing between muffler plates was shown to enhance the muffler transmission loss by 40%. To assess the baffle effect on flow, the OpenFoam CFD libraries were utilized using the thermal baffle approach model. Baffles were found to cause sudden drop in fluid temperature in axial flow direction. The outlet exhaust gases temperature was found to decrease by 15% as the baffle cut ratio changed from 75% to 25%.

      PubDate: 2017-04-04T18:30:13Z
      DOI: 10.1016/j.csite.2017.03.006
  • Optimal and critical values of geometrical parameters of shell and
           helically coiled tube heat exchangers

    • Authors: Ashkan Alimoradi
      Abstract: Publication date: Available online 23 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): Ashkan Alimoradi
      In the present study, calculations of the heat transfer and entropy generation were performed for steady state forced convection heat transfer in shell and helically coiled tube heat exchangers. The effect of geometrical parameters of the heat exchanger including: tube diameter (dt), coil diameter (dc), diameter of the inlet of shell (dv), shell diameter (dsh), height of coil (Hc), height of shell (Hsh), pitch (p) and the distance between the inlet and outlet of the shell (f) on the heat transfer rate and entropy generation was investigated Simultaneously. The critical and optimal values of this parameters were obtained which minimize and maximize the COD (heat transfer rate per entropy generation), respectively.

      PubDate: 2017-03-27T16:40:11Z
      DOI: 10.1016/j.csite.2017.03.003
  • Multiphysics Simulations of Thermoelectric Generator Modules with Cold and
           Hot Blocks and Effects of Some Factors

    • Authors: W Li; M C Paul; A Montecucco; J Siviter; A R Knox; T Sweet; M Gao; H Baig; T K Mallick; G Han; D H Gregory; F Azough; R Freer
      Abstract: Publication date: Available online 23 March 2017
      Source:Case Studies in Thermal Engineering
      Author(s): W Li, M C Paul, A Montecucco, J Siviter, A R Knox, T Sweet, M Gao, H Baig, T K Mallick, G Han, D H Gregory, F Azough, R Freer
      Transient and steady-state multiphysics numerical simulations are performed to investigate the thermal and electrical performances of a thermoelectric generator (TEG) module placed between hot and cold blocks. Effects of heat radiation, leg length and Seebeck coefficient on the TEG thermal and electrical performances are identified. A new correlation for the Seebeck coefficient with temperature is proposed. Radiation effect on the thermal and electric performances is found to be negligible under both the transient and steady-state conditions. The leg length of TEG module shows a considerable influence on the electrical performance but little on the thermal performance under the transient condition. A nearly linear temperature profile on a leg of the TEG module is identified. The temperature profile on the substrate surfaces is non-uniform, especially in the contacted areas between the straps (tabs) and the substrates.

      PubDate: 2017-03-27T16:40:11Z
      DOI: 10.1016/j.csite.2017.03.005
  • 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

    • 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

    • 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)
  • Investigation of exergy efficiency in shell and helically coiled tube heat

    • 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

    • 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

    • 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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