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ENGINEERING (1326 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 21)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 7)
ACS Nano     Hybrid Journal   (Followers: 317)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
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: 9)
Advanced Journal of Graduate Research     Open Access  
Advanced Nonlinear Studies     Hybrid Journal  
Advanced Science     Open Access   (Followers: 6)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 11)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Engineering Software     Hybrid Journal   (Followers: 28)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 14)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 24)
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: 29)
Advances in Nonlinear Analysis     Hybrid Journal  
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 16)
Advances in Polymer Science     Hybrid Journal   (Followers: 45)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 51)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Al-Nahrain Journal for Engineering Sciences     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: 10)
American Journal of Engineering Education     Open Access   (Followers: 12)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 25)
Anadolu University Journal of Science and Technology A : Applied Sciences and Engineering     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 3)
Annals of Regional Science     Hybrid Journal   (Followers: 8)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
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: 7)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 20)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 14)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 6)
Applied Sciences     Open Access   (Followers: 4)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 7)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 9)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 2)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 2)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 9)
Asian Journal of Control     Hybrid Journal  
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  
AURUM : Mühendislik Sistemleri ve Mimarlık Dergisi = Aurum Journal of Engineering Systems and Architecture     Open Access  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Automotive Experiences     Open Access  
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
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: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 2)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
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)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 12)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering     Hybrid Journal   (Followers: 2)
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: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 35)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomicrofluidics     Open Access   (Followers: 5)
BioNanoMaterials     Open Access   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 40)
Bitlis Eren University Journal of Science and Technology     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers Droit, Sciences & Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 32)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 44)
Carbon Resources Conversion     Open Access   (Followers: 1)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 6)
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     Hybrid Journal   (Followers: 9)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 3)
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)
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 3)
CienciaUAT     Open Access   (Followers: 1)
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: 13)
City, Culture and Society     Hybrid Journal   (Followers: 23)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Hybrid Journal   (Followers: 8)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 3)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Color Research & Application     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 15)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Information Science and Management Engineering     Open Access   (Followers: 4)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 29)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 293)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 230)
Composites Part B : Engineering     Hybrid Journal   (Followers: 271)
Composites Science and Technology     Hybrid Journal   (Followers: 204)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Computational Optimization and Applications     Hybrid Journal   (Followers: 8)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)

        1 2 3 4 5 6 7 | Last

Journal Cover
Arabian Journal for Science and Engineering
Journal Prestige (SJR): 0.303
Citation Impact (citeScore): 1
Number of Followers: 5  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1319-8025
Published by Springer-Verlag Homepage  [2352 journals]
  • Optimization Study of Operation Parameters for Extracting $$\hbox
           {Cu}^{2+}$$ Cu 2 + from Sulfuric Solution Containing $$\hbox {Co}^{2+}$$
           Co 2 + with LIX984N in a Laminar Microchip
    • Authors: Bi-quan Xiao; Feng Jiang; Jin-hui Peng; Shao-hua Ju; Li-hua Zhang; Shao-hua Yin; Li-bo Zhang; Lei Xu; Shi-hong Tian
      Pages: 2145 - 2153
      Abstract: Copper and cobalt usually coexist in the leachate of waste lithium ion batteries, sea nodules and other copper ore or by-product. Conventional methods for the separation of copper and cobalt hardly avoid some defects, such as longer extraction time, co-extraction and too many stages. In this paper, a microfluidic extraction procedure for simultaneously separating copper \((\hbox {Cu}^{2+})\) and cobalt \((\hbox {Co}^{2+})\) ions in a microchannel was investigated. In addition, some key operation parameters, such as initial pH, volume flow rate and extractant concentration, were optimized by a method of response surface methodology (RSM). The result showed that under the optimized operation parameters of initial pH of 2.5, volume flow rate of \(0.035~\hbox {mL}~\hbox {min}^{-1}\) and extractant concentration of 17.36%, the extraction rate of copper could be as high as 96.73%, with a low cobalt extraction rate, which was only 2.41%.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2495-1
      Issue No: Vol. 43, No. 5 (2018)
  • The Effect of Vertical Vibrations on Heat and Mass Transfers Through
           Natural Convection in Partially Porous Cavity
    • Authors: El-hachemi Zidi; Abdelmalek Hasseine; Noureddine Moummi
      Pages: 2195 - 2204
      Abstract: This paper presents a numerical analysis on natural thermosolutal convection in a rectangular enclosure filled partially and vertically by a porous layer and subjected to a vertical vibration. The Brinkman–Extended Darcy equation is used for modeling the fluid flow through the porous section in the enclosure. The effect of vertical vibrations on the flow structure, heat and mass transfers for various porous layer thicknesses are presented graphically. It is observed that vertical vibration decreases the flow intensity and the fluid penetration into porous section. It is also observed that the increase of vibration intensity has a decreasing effect on both heat and mass transfer rates. This decreasing effect becomes more important for lower porous section ratios. These findings show that the vibration effect can be used beneficially in many engineering applications where operation is conducted under restricted permeability and temperature gradients.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2560-9
      Issue No: Vol. 43, No. 5 (2018)
  • Fixed-Bed Adsorption of Ranitidine Hydrochloride Onto Microwave
           Assisted—Activated Aegle marmelos Correa Fruit Shell: Statistical
           Optimization and Breakthrough Modelling
    • Authors: N. Sivarajasekar; N. Mohanraj; R. Baskar; S. Sivamani
      Pages: 2205 - 2215
      Abstract: In this study, the feasibility of using microwave-irradiated Aegle marmelos Correa fruit shell was investigated in a fixed-bed column towards sorptive removal of ranitidine hydrochloride (RH) from simulated aqueous solution. Characterizations of adsorbent such as SEM, point of zero charge, BET surface area, Boehm surface functional groups, thermal and elemental analysis were carried out. Box–Behnken response surface methodology was utilized to optimize the process parameters such as influent flow rate (2.5–4.5 ml min−1), initial RH concentration (100–200 mg l−1), adsorbent particle size (0.082–0.20 mm), and fixed-bed height (5–10 cm). The highest fixed-bed adsorptive removal of RH at optimum conditions viz. bed height 9.19 cm, initial RH concentration 184.94 mg l−1, flow rate 3.76 ml min−1 and adsorbent particle size 0.2 mm was estimated to be 72.86%. Fixed-bed adsorption experiments were carried out at optimum conditions obtained at different bed heights, and the data obtained were fitted into different kinetic models to predict the applicable breakthrough curve model. Dose–response model was observed to be the best suited model for mathematical description of RH removal in fixed-bed column studies over other selected models.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2565-4
      Issue No: Vol. 43, No. 5 (2018)
  • The Role of Cationic Coagulant-to-Cell Interaction in Dictating the
           Flocculation-Aided Sedimentation of Freshwater Microalgae
    • Authors: Pey Yi Toh; Nurfarah Farhana Azenan; Liherng Wong; Yin Sim Ng; Lee Muei Chng; JitKang Lim; Derek Juinn Chieh Chan
      Pages: 2217 - 2225
      Abstract: The coagulant chitosan and poly(diallyldimethylammonium chloride) (PDDA) were proven effective to aid the sedimentation of microalgal cells through electrostatic patch flocculation. A total amount of 30 mg/L chitosan and PDDA can achieve cell separation efficiency of \(96.7 \pm 0.7\) and \(98.4 \pm 1.0\) %, respectively. The chitosan outperformed PDDA and promoted 4.4 times faster rate of cell sedimentation than the self-sedimentation rate of cells. The chitosan employed the mechanism of charge neutralization to form larger flocs, while the PDDA that favored the formation of loops and tails protruding away from cell surface employed the bridging mechanism to form flocs. The rate of cell sedimentation induced by chitosan was the highest at pH 7, 8 (control) and 9 compared to that of PDDA, where the cell flocculation by using chitosan was dominated by charge neutralization mechanism at pH 7 and 8 (control), while the cell flocculation was mainly driven by bridging mechanism at pH 9. This result shows that the chitosan is feasible in the harvesting of freshwater microalgae without the need of pH adjustment. Therefore, the chitosan was proven more reliable and time effective than the PDDA in harvesting the freshwater Chlorella sp. without the need of pH adjustment.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2584-1
      Issue No: Vol. 43, No. 5 (2018)
  • CFD Simulation of the Distribution of Pressure and Shear Rate on the
           Surface of Rotating Membrane Equipped with Vanes for the Ultrafiltration
           of Dairy Effluent
    • Authors: Soufyane Ladeg; Zhenzhou Zhu; Nadji Moulai-Mostefa; Luhui Ding; Michel Y. Jaffrin
      Pages: 2237 - 2245
      Abstract: This paper reports computational fluid dynamics (CFD) studies on the performance of flow inside a rotating disk filtration module. This module consists of a disk rotating at speeds between 1000 and 3000 rpm inside a cylindrical housing equipped with a stationary circular flat membrane. In order to investigate the influence of surface geometry, a smooth disk and a disk equipped with vanes were used. Commercial CFD software was utilized for the characterization of the flow inside the membrane module. The predicted results were compared at different values of rotating and inlet velocities with previous works and also with experimental ones obtained in the filtration of dairy effluent in the same conditions. The influence of the geometry of the disk was also evaluated. The obtained results show that an increase in rotating velocity leads to an increase in the pressure and shear stress at the membrane surface. The highest pressures were obtained when using disks equipped with vanes, this was due to the turbulent area created between the vanes visualized in animated views. It was also found that the presence of vanes on the surface of disk has a great effect on the shear stress; it contributes to the reduction in fouling and improvement in filtration flux.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2645-5
      Issue No: Vol. 43, No. 5 (2018)
  • Determination of Mass Transfer Coefficients on the Obtaining of Caffeine
           from Tea Stalk by Supercritical Carbon Dioxide With and Without Ethanol
    • Authors: Hacer İçen; Metin Gürü
      Pages: 2257 - 2262
      Abstract: This study deals determination of mass transfer coefficients on the obtaining of caffeine from tea stalk wastes by supercritical carbon dioxide extraction. Tea stalk wastes of Turkish tea plants that have no economical value were employed as raw material throughout determination of mass transfer experiments. Mass transfer coefficients were calculated at the caffeine extraction experiments with and without cosolvent. For this purpose, ethanol was pumped to the supercritical carbon dioxide extraction system as a cosolvent. In these experimental studies, extraction procedures were repeated at different temperature by keeping optimum conditions at specified the previous study. Optimized parameters in the caffeine leaching from tea stalks were fixed throughout the study such as pressure of 250 bar, the average particle size of 0.202 mm, \(\hbox {CO}_{2}\) flow rate of 10 g/min (5.23 g ethanol/100 g \(\hbox {CO}_{2})\) . Correlation was obtained from retention time in order to calculate mass transfer coefficient. Using the correlation, coefficients were calculated in supercritical \(\hbox {CO}_{2}\) extraction with and without ethanol at 333 K temperature, \(k_\mathrm{L}=3.782\times 10^{-8}\,\hbox {m}/\hbox {min}\) , \(k_\mathrm{L}=1.591\times 10^{-8}\,\hbox {m}/\hbox {min}\) , respectively. Consequently, it has been observed that mass transfer coefficient is increased approximately 2.4 times when ethanol is utilized the amount of 5% besides of 95% \(\hbox {CO}_{2}\) . On the other hand, more caffeine can be extracted in a shorter period by means of ethanol pumping as cosolvent.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2684-y
      Issue No: Vol. 43, No. 5 (2018)
  • Transpiration Effects on MHD Flow Over a Stretched Cylinder with
           Cattaneo–Christov Heat Flux with Suction or Injection
    • Authors: C. S. K. Raju; R. V. M. S. S. Kiran Kumar; S. V. K. Varma; A. G. Madaki; P. Durga Prasad
      Pages: 2273 - 2280
      Abstract: A theoretical analysis is performed for investigating the flow and heat transfer characteristics of Maxwell fluid over a stretching cylinder with Cattaneo–Christov, heat source or sink, and suction/injection. The solution to the transformed similarity equations is derived using Runge–Kutta fourth-order method along shooting technique. The present result for both the surface shear stress and the local Nusselt number is validated with the previously published results, while a very sound agreement is attained. The impacts of the distinct parameters related to this study are presented in graph and tabular form, respectively. Moreover, the local Nusselt number and surface shear stress have been computed for both the suction and injection cases. It is found that strengthening the thermal relaxation parameter value increases the heat transfer rate. The dimensional heat transfer rate is observed being rising in the injection case when compared with the suction case.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2687-8
      Issue No: Vol. 43, No. 5 (2018)
  • Thin Reaction Zone Model for Evaluating the Mechanisms that Control the
           Char Gasification Process: 1. Quasi-steady State
    • Authors: Takdir Syarif; Hary Sulistyo; Wahyudi Budi Sediawan; Budhijanto
      Pages: 2291 - 2298
      Abstract: Reaction mechanism takes place in char gasification was tested by kinetic studies. A modified kinetic model (thin reaction zone model) was developed to evaluate the mechanisms controlling the process of gasification. The model was compared to the experimental data of char gasification using steam as gasification agent. The gasification was carried out at 600– \(800\,{^{\circ }}\hbox {C}\) for 60 min. The model assuming the mass transfer of steam through the ash layer controls the reaction rate work well. The average error at operating temperatures of 600, 700, and \(800\,{^{\circ }}\hbox {C}\) was 2.89, 1.75, and 3.26% respectively.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2735-4
      Issue No: Vol. 43, No. 5 (2018)
  • Investigating the Compatibility of Enzyme with Chelating Agents for
           Calcium Carbonate Filter Cake Removal
    • Authors: Salaheldin Elkatatny; Mohamed Mahmoud
      Pages: 2309 - 2318
      Abstract: Removal of water-based filter cake formed during drilling and hydraulic fracturing operations is a difficult task. Conventional acids, such as hydrochloric acid, organic acid, or a mixture of these acids, can be used to remove the filter cake. The common issues of these acids are rapid and uncontrolled reaction rate and corrosion to well tubulars, especially in horizontal and deep wells. Chelating agents were introduced in the oil industry to solve the problems associated with the conventional acids. Up to the authors’ knowledge, the reaction of chelating agents with starch, which is a major component of the filter cake, was not investigated in the literature. The objectives of this study are to (1) assess the reaction of starch with different chelating agents, namely ethylenediaminetetraacetic acid (EDTA), glutamic acid diacetic acid (GLDA), and diethylene triamine penta-acetic acid (DTPA), at different conditions of pH and temperature, (2) evaluate the compatibility of chelating agents with enzyme [high thermally stable \(\upalpha \) -amylase enzymes (HTA)], (3) assess the reaction of enzyme with starch and xanthan gum, and (4) design the best scenario for calcium carbonate filter cake removal. The obtained results showed that EDTA (20 wt%, pH 7, and 12), DTPA (20 wt%, pH 7, and 12), and GLDA (20 wt%, pH 4, 7, and 12) were not able to break the starch after hot rolling for different time periods at \(200\,{^{\circ }}\hbox {F}\) . Different chelating agents were found to be incompatible with \(\upalpha \) -amylase enzyme (HTA enzyme that should be used to remove the starch). The two-stage scenario was found to be the best practice to remove the calcium carbonate filter cake in 22 h with 100% removal efficiency and 100% retained permeability. Computer tomography confirmed that external and internal filter cake was completely removed, and no formation damage was existing.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2727-4
      Issue No: Vol. 43, No. 5 (2018)
  • Aluminium Leaching by Heterotrophic Microorganism Aspergillus niger : An
           Acidic Leaching'
    • Authors: Martin Urík; Filip Polák; Marek Bujdoš; Ivana Pifková; Lucia Kořenková; Pavol Littera; Peter Matúš
      Pages: 2369 - 2374
      Abstract: Bioleaching of aluminium mineral boehmite by filamentous fungus Aspergillus niger was compared to chemical leaching by citric, oxalic and hydrochloric acids to evaluate the significance of A. niger’s metabolites on aluminium mobilization from this natural component of the aluminium ore. Our results highlighted that leaching efficiency of hydrochloric acid at pH 2 was 2.7 times lower compared to fungal bioleaching efficiency. When the organic acids were compared, oxalic acid was a stronger aluminium leaching agent than citric acid. The results suggest that fungal metabolites significantly promoted the release of aluminium and that their acidic properties, despite being useful, were not the most critical factor in the bioleaching of aluminium.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2784-8
      Issue No: Vol. 43, No. 5 (2018)
  • Sintering and Coking: Effect of Preparation Methods on the Deactivation of
           $$\hbox {Co}$$ Co – $$\hbox {Ni/TiO}_{2}$$ Ni/TiO 2 in Fischer–Tropsch
    • Authors: Mahboobeh Dowlati; Nasibeh Siyavashi; Hamid Reza Azizi
      Pages: 2441 - 2450
      Abstract: The main challenge of this work is study effect of preparation methods, co-precipitation and sol–gel, on the deactivation of \(\hbox {Co}\) – \(\hbox {Ni/TiO}_{2}\) catalysts in Fischer–Tropsch synthesis. Revealed that coking and sintering are two main mechanisms which have a significant influence on the deactivation of the catalyst. The catalysts were tested under industrially conditions ( \(T=350\,{^{\circ }}\hbox {C}\) , \(P=10\,\hbox {bar}\) , \(\hbox {H}_{2}/\hbox {CO}=2\) and \(\hbox {GHSV}=7200\,\hbox {h}^{-1})\) and during 300 h on stream. Although CO conversion and product selectivity were similar for both catalysts, the sample prepared by co-precipitation method showed a better catalytic performance. The mechanisms of deactivation were interpreted using TPR, TEM/EDS and XRD techniques. Depicted that coking and sintering are two predominate mechanisms for deactivation of co-precipitation and sol–gel catalysts, respectively.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2845-z
      Issue No: Vol. 43, No. 5 (2018)
  • Thermodynamic Study and Optimization a Nano-Zeolite for Dehydration Liquid
           Fuel (DMAZ) Using Taguchi $$\hbox {L}_{16}$$ L 16 Orthogonal Array
    • Authors: Hamid Reza Azizi; Shahram Ghanbari Pakdehi; Saeed Babaee
      Pages: 2465 - 2472
      Abstract: In this research, a typical molecular sieve successfully was applied to liquid fuel dimethyl amino ethyl azide (DMAZ) dehydration which was synthesized using hydrothermal method. \(\hbox {L}_{16}\) orthogonal array was used for experimental design, and the results were analyzed using analysis of variance. Initial concentration ( \({C}_{0})\) , shaking rate (SR), temperature (T), and adsorbent dosage (AD) as controllable parameters were varied at four levels to found their effects on the capacity of synthesized zeolite (q). The AD and \({C}_{0}\) parameters have been found to be the most significant parameter with 39.92 and 39.70% contribution to the q, respectively. The predicted and real adsorptive removal of water at optimum levels, \(C_{0}= 1.25\,\hbox {wt},\hbox { SR}=150\,\hbox {rpm, AD}=2.25\hbox { g}\) , and \({T}=30\) –35  \({^{\circ }}\hbox {C}\) , were found to be 208.08 and 210.2, respectively. The values of thermodynamic parameters proved that dehydration of DMAZ using this zeolite has an exothermic character, physical, and spontaneous nature.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2891-6
      Issue No: Vol. 43, No. 5 (2018)
  • Performance of Horizontal Wells with Inflow Control Devices in Homogeneous
           Reservoirs with Bottom Water Drive
    • Authors: Qin Li; Jingnan Xiao; QuanShu Zeng; Christopher Xiao
      Pages: 2473 - 2479
      Abstract: Horizontal well techniques play an important role in the development of unconventional oil and gas plays. A key challenge in horizontal well completions is that water cut will rise rapidly once water breakthrough without inflow control. Inflow control devices restrict flow by creating an additional drop in pressure to equal the drop in wellbore pressure in order to reduce water or gas coning. Once a control device is installed in the wellbore, it is almost impossible to adjust. As a result, it is extremely important to understand the oil–water pressure profile and the long-term behavior of well completions with ICDs. We use the theory of dynamic simulation-coupled well-reservoir flow to analyze the performance of horizontal well completions with and without ICDs using the multi-segment well model. This study proposes a new single-flow wellbore model and develops the model of oil–water flow in horizontal wellbore with influx. The performance of horizontal well completions with ICDs in reservoir with water drive is analyzed on the basis of the new coupled reservoir–wellbore model. Simulation results show that water breakthrough first occurs near the heel of the horizontal well due to the drop in pressure in the wellbore by the end of water-free production period in the homogeneous reservoirs. We also point out that completion with ICDs can optimize production in horizontal wells with long production sections, low drawdown pressure and high production rates. In these situations, the effects of a drop in oil–water two-phase pressure are significant.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2551-x
      Issue No: Vol. 43, No. 5 (2018)
  • Prediction of Flammability Limits for Gases from the Decontamination
           Evaporation–Condensation Process of Oil Sludge
    • Authors: T. Hlincik; P. Buryan; Š. Buryan
      Pages: 2481 - 2489
      Abstract: In this paper, we focus on deriving mathematical description of flammability limits of gases released in the evaporation–condensation technological process during oil sludge decontamination. We have derived new relations that enable to express simultaneously dependence of both upper and lower flammability limits on gas temperature and reduced gas pressure. We also show that displaying the dependence of both limits in the form of 3D diagrams helps to clarify the determination of the undesirable technological conditions in situations where exhaustion of released flammable and toxic gases plays a significant role. Our representation makes it possible to quickly locate possible critical states in the construction designs, during apparatus selections, during induction of inertisation gas mixture, in the events of its failure, and also during selection of volume and composition of such gases.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2547-6
      Issue No: Vol. 43, No. 5 (2018)
  • Micelle Formation of Aerosol-OT Surfactants in Sea Water Salinity
    • Authors: Azza Hashim Abbas; Wan Rosli Wan Sulaiman; Mohd Zaidi Jaafar; Agi Augustine Aja
      Pages: 2515 - 2519
      Abstract: Gemini surfactants group recently showed importance in screening techniques for the evaluation and selection of chemicals for enhanced oil recovery. Aerosol-OT (sodium bis (2-ethylhexyl) sulfosuccinate, AOT) is a versatile anionic Gemini surfactant which is widely used in the chemical and biophysical research, which is also included in the category of sulfonated hydrocarbons and shows high potential in laboratory experiments. In this paper, the micellar behaviour of anionic AOT in presence of high sodium salt concentration was studied at different temperature from (25–105) \(\,^{\circ }\) C. Surface tension techniques using duoy ring were applied for each surfactant concentration to find the critical micelle concentration (CMC) at each temperature. Several thermodynamic parameters were also reported as the standard Gibbs energies of micellization, \(\Delta G^{0}\) ; the standard enthalpy change of micellization, \(\Delta H^{0}\) ; and the standard entropies of micellization, \(\Delta S^{0}\) , were calculated from the temperature effect on the CMC. Results showed that CMC values increased with temperature. The enthalpy of micellization was found to be negative in all cases, and it showed a strong dependence on temperature in the AOT solution in the presence of high concentration of NaCl system.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2593-0
      Issue No: Vol. 43, No. 5 (2018)
  • Improving Oil Recovery Using Miscible Selective Simultaneous Water
           Alternating Gas (MSSWAG) Injection in One of the Iranian Reservoirs
    • Authors: Zohreh Dermanaki Farahani; Mohammad Reza Khorsand Movaghar
      Pages: 2521 - 2535
      Abstract: In the current investigation, feasibility study has been done for miscible selective simultaneous water alternating gas (MSSWAG) injection compared with immiscible and miscible water alternating gas (IWAG and MWAG) injection in one of the Iranian reservoirs which has been subject to water flooding for several years and the recovery factor (RF) for water flooding is about 23% of the original oil in place. Through IWAG injection, the effect of gas types comprising lean and rich has been investigated which led to increase the recovery factor to 29% for rich and 28% for lean gas. Moreover, miscible injection results show that the recovery factor for rich MWAG with optimized injection pore volume led to 41.74% which shows 12% greater values than the value for immiscible one. Also, sensitivity analysis represents that under rich MWAG injection with 1:2 WAG ratio and 100-day injection period, recovery factor has improved by 7% and reached 48.55%. In continuation to the study with emphasis on the advantages of miscibility, rich MSSWAG with RF: 54.73% has led to increase the recovery factor by 6% compared to rich MWAG with RF: 48.55% (being the best scenario in this study based on simulation results). Finally, considering the economic aspects, the net present value for rich MWAG and rich MSSWAG is significantly increased by approximately average 31% relative to water flooding.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2667-z
      Issue No: Vol. 43, No. 5 (2018)
  • Quantitative Description Method for Uncertainty of Formation Pore Pressure
    • Authors: Ya-Nan Sheng; Zhi-Chuan Guan; Yu-Qiang Xu
      Pages: 2605 - 2613
      Abstract: Nowadays, the oil and gas exploration and development have been developed into the deep and complex formations. More and more abnormal pressure is encountered, which gives a great challenge to the safe and efficient drilling. Accurate description of pore pressure is of great significance to avoid drilling risk. The complexity of petroleum geology, the incompleteness of the logging or seismic data, the precision of the mathematical model and other issues can all lead to uncertainty in pore pressure prediction. The uncertainty of pore pressure is one of the fundamental causes for drilling risk. In order to address these challenges, a new quantitative description method for uncertainty of pore pressure was established. Firstly the sources of the pore pressure prediction uncertainty were analyzed. Then the uncertainties of Eaton index and normal compaction trend were, respectively, described. Finally the uncertainty interval of pore pressure was established based on Monte–Carlo simulation and normal information diffusion theory. The pore pressure prediction result obtained in this paper was not a single value, but an interval with probability distribution characteristic. The results of example showed that the measured values of pore pressure were all in pore pressure interval with confidence of 90%. Case study validated the feasibility and effectiveness of the proposed method.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2863-x
      Issue No: Vol. 43, No. 5 (2018)
  • Method of Predicting Tight Gas Deliverability from Conventional Well
           Logging Data Based on Experimental Simulation
    • Authors: Die Liu; Liang Xiao; Junran Li; Jun Lu
      Pages: 2615 - 2623
      Abstract: Gas deliverability estimation is very important in predicting effective gas-bearing regions and formulating reasonable development program. Conventional deliverability prediction method based on absolute open flow cannot be used in exploration wells due to the important input data of drill stem test (DST) data that cannot be first acquired. In this study, to establish reasonable model to predict exploration well deliverability, four core samples, drilled from the same tight sandstone reservoirs of northeast China, are applied for deliverability simulation experiment under formation condition. Gas flow rate and production data under different simulated drawdown pressures are acquired. A parameter of gas deliverability index, which is used to characterize gas production capability per well, is introduced. The relationships among gas deliverability index, reservoir physical properties (such as porosity, permeability and gas saturation) and drawdown pressure are analyzed. The results illustrate that for our target tight gas sandstone reservoirs, the optimal drawdown pressure is 5.0 MPa, and good relationship exists between gas deliverability index with the combined parameter of permeability and gas saturation. Based on this relationship, a model of predicting gas deliverability index from reservoir physical properties is established, and it is extended to field application to predict gas production. Comparison of predicted gas deliverability by using this model and acquired result from DST data illustrates the reliability of the established model.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2916-1
      Issue No: Vol. 43, No. 5 (2018)
  • A Polymer Injectivity Model Establishment and Application for Early
           Polymer Injection
    • Authors: Xiang’an Lu; Fan Liu; Guangwei Liu; Yanli Pei; Hanqiao Jiang; Jishuang Chen
      Pages: 2625 - 2632
      Abstract: In China, early polymer injection has been proved to be an effective way to enhance oil recovery in Bohai offshore field. Since the near wellbore controls injectivity, two-phase flow function needs to be appropriately accounted for to predict polymer injectivity. In this paper, we account for polymer rheology and water–oil two-phase flow in the polymer injectivity model. To properly describe the fluid distribution, we define five regions with unique saturation profiles during polymer flooding and then established a polymer injectivity prediction model for both monolayer and multilayer reservoirs. Compared to the traditional numerical simulation method, the new model improves the injectivity prediction efficiency in early polymer injection. The new model is basically a rapid semi-analytical numerical simulator that can predict the dynamic polymer injectivity based on several field data obtained during an early polymer flood.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2950-z
      Issue No: Vol. 43, No. 5 (2018)
  • Dynamic and Static Combination Method for Fracture-Vug Unit Division of
           Fractured-Vuggy Reservoirs
    • Authors: Yang Xiao; Zi-wei Zhang; Tong-wen Jiang; Zhen-zhong Cai; Xing-liang Deng; Jian-feng Zhou
      Pages: 2633 - 2640
      Abstract: Ying Mai-2 Block of Tarim Oil Field is a karst fractured-vuggy reservoir. Along with the research on well location demonstration and recovery ratio improvement in the developing progress, the importance of fracture-vug unit division is gradually revealed. This paper presents an integrated method for establishing a fractured element/flow unit in the oil field and discusses its importance and its influence on future well location optimization. With more dynamic data from the oil field, this workflow can be reused to divide the unit during the whole life of the well. This paper begins with the understanding and characterization of involved reservoirs, then establishes a geological concept model and makes clear reservoir type, geometric boundary, reserves and aquifer energy of the fracture-vug unit. Dynamic and static data are used by multidisciplinary means to describe the fracture-vug unit, and reasonable recommendations are proposed on well testing for these reservoirs. A comprehensive evaluation on the fracture-vug combination model and dominant reservoir type is made based upon the flow experiments of a large-scale physical model in combination with production performance and well testing data. Based on this, the fracture-vug units in an individual well are divided using dynamic production characterization. Finally, the fracture-vug units for Ying Mai-2 Block are divided by seismic prediction and gridding judgment taking the units with well data as the standard, and thus a powerful guidance for the reservoir development at present stage is provided.
      PubDate: 2018-05-01
      DOI: 10.1007/s13369-017-2976-2
      Issue No: Vol. 43, No. 5 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
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