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< Page ,Total 34 >
Comprehensive coupling model of counter-flow wet cooling tower and its thermal performance analysis EI
期刊论文 | 2022 , 238 | Energy
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Abstract :

Counter-flow wet cooling towers are equipment for removing heat from water to environment. The traditional model for their thermal performance mainly focuses on the heat exchange in packing. The coupling among spray zone, rain zone, and packing are not considered. In this study, a coupling model consisting of mathematical descriptions of the spray zone, rain zone, and packing is proposed. The thermal performance is investigated based on the interaction of three zones. An actual cooling tower test report is used to validate the coupling model. Subsequently, the efficiency and exit water temperature of the cooling tower is analyzed under various conditions. The results indicate that the relative error is 5.68 % when the coupling relation is neglected. The relative error is reduced to 3.25 % when the spray zone and rain zone are coupled with packing. The cooling tower efficiency and exit water temperature increase with increasing air humidity, while the smaller droplets diameter and higher air-to-water mass flow rate ratio cause lower exit water temperature and higher cooling tower efficiency. Besides, the droplets velocity has little influence on these. The results of this study provide theoretical foundations for accurate performance prediction and guide the direction for cooling towers optimization. © 2021 Elsevier Ltd

Keyword :

Cooling Mass transfer Cooling towers Temperature Rain Air Drops Efficiency

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GB/T 7714 Yu, J.H , Qu, Z.G , Zhang, J.F et al. Comprehensive coupling model of counter-flow wet cooling tower and its thermal performance analysis [J]. | Energy , 2022 , 238 .
MLA Yu, J.H et al. "Comprehensive coupling model of counter-flow wet cooling tower and its thermal performance analysis" . | Energy 238 (2022) .
APA Yu, J.H , Qu, Z.G , Zhang, J.F , Hu, S.J , Guan, J . Comprehensive coupling model of counter-flow wet cooling tower and its thermal performance analysis . | Energy , 2022 , 238 .
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Reverse identification method for simultaneous estimation of thermal conductivity and thermal contact conductance of multilayered composites EI SCIE
期刊论文 | 2021 , 173 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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Abstract :

Multilayered insulation composites are characterized by their light weight, low thermal conductivity (TC), and good wave permeability and are widely used as heat-insulating materials in aerospace engineering. The existing direct measurement standards and equipment are not applicable in high-temperature, high-radiation, and low-pressure environments for materials whose thermal conductivities are similar to that of air. Moreover, the thermal responses of a multilayered insulation composite to the same boundary conditions resulting from different operation environments are different as a result of its wave permeability and spectral selectivity. The effective TCs are different in different operation environments. There is inevitably a non-negligible thermal contact conductance (TCC) between the individual layers. Thus, it is important to measure the effective TC of a multilayered insulation composite under normal working conditions in different operating environments for the thermal design of the insulation layer. In this study, an indirect measurement strategy based on inverse problem analysis was proposed to simultaneously estimate the TC and TCC of a multilayered insulation composite. The conjugate gradient method was used for the parameter and function estimations of the TC and TCC. The accuracy and robustness of the proposed method were verified numerically and experimentally. The results of a heat-shielding experiment showed no more than a 2.4% deviation for the estimated TC and 11.5% deviation between the measured and estimated temperatures. This method may offer a strategy to measure the thermophysical properties of multilayered insulation composites in an operational environment for aerospace engineering. It can improve the TC measurement accuracy and provide the basis of the physical properties for the thermal insulation design of multilayered insulation composites for use in various operation environments. (C) 2021 Elsevier Ltd. All rights reserved.

Keyword :

Thermal conductivity Thermal contact conductance Inverse problem Multilayered insulation composite

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GB/T 7714 Guo, J. , Chen, X. N. , Qu, Z. G. et al. Reverse identification method for simultaneous estimation of thermal conductivity and thermal contact conductance of multilayered composites [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 173 .
MLA Guo, J. et al. "Reverse identification method for simultaneous estimation of thermal conductivity and thermal contact conductance of multilayered composites" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 173 (2021) .
APA Guo, J. , Chen, X. N. , Qu, Z. G. , Ren, Q. L. . Reverse identification method for simultaneous estimation of thermal conductivity and thermal contact conductance of multilayered composites . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 173 .
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Experimental Study of Glaucoma Drug Delivery Across Cornea EI
期刊论文 | 2021 , 42 (7) , 1858-1863 | Journal of Engineering Thermophysics
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Abstract :

Glaucoma is one of the diseases that cause blindness in the eye. Topical application is an effective method for the treatment of glaucoma, but the low permeability of the cornea limits the rapid transport of the drug to the recombinant tissue, so it is urgent to study the transmembrane transport properties of glaucoma drugs. ω=0.01, ω=0.05 two different mass fractions of the aqueous solution of pilocarpine as a glaucoma drug preparation, acting on the porcine cornea for drug permeability in vitro experiments. The experimental results show that: The growth rate of the drug concentration in the receiving group wasω=0.05 higher than that in the experimental group, and the growth rate of the drug concentration was proportional to the initial target concentration; The drug accumulation process is mainly composed of two stages of unsteady state and pseudo steady state. The function of drug accumulation and drug concentration, time, corneal thickness, and drug diffusion coefficient were obtained in the pseudo steady state; The diffusion coefficient of aqueous solution of pilocarpine across the cornea is about 2.47×10-6 cm2/s. This paper is helpful to establish a mathematical description equation for transmembrane transport properties of glaucoma drugs in the future, thereby optimize the drug design of glaucoma drugs. © 2021, Science Press. All right reserved.

Keyword :

Transport properties Pharmacokinetics Drug delivery Ophthalmology Diffusion

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GB/T 7714 Xu, Hong-Tao , Huang, Fei , Lei, Yuan et al. Experimental Study of Glaucoma Drug Delivery Across Cornea [J]. | Journal of Engineering Thermophysics , 2021 , 42 (7) : 1858-1863 .
MLA Xu, Hong-Tao et al. "Experimental Study of Glaucoma Drug Delivery Across Cornea" . | Journal of Engineering Thermophysics 42 . 7 (2021) : 1858-1863 .
APA Xu, Hong-Tao , Huang, Fei , Lei, Yuan , Qu, Zhi-Guo , Chen, Jian , Cui, Guo-Min . Experimental Study of Glaucoma Drug Delivery Across Cornea . | Journal of Engineering Thermophysics , 2021 , 42 (7) , 1858-1863 .
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Enhancement of solar pond stability performance using an external magnetic field EI SCIE
期刊论文 | 2021 , 243 | Energy Conversion and Management
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Abstract :

A solar pond is a simple and reliable system that collects and stores solar energy for applications with low-grade heat supply. The main obstacle to the long-term stable operation of a solar pond is interface erosion induced by double-diffusive convection. In this study, an active method of using an external magnetic field is proposed to repress the intense convection region and improve its corresponding operating stability. A two-dimensional transient model is developed and solved using the lattice Boltzmann method with multiple-relaxation-time collisions. The double-diffusive convection, variation of solar energy absorption to depth, and changes in solution electrical conductivity are considered in the model. The fluid flow, heat, and mass transfer characteristics were investigated under continuous high illumination with or without an external magnetic field. When magnetic control is exerted on a solar pond, the decrease in the nonconvective zone thickness caused by interface erosion changes from 14.75% to 0. The state of the solar pond is transformed from a thermally unstable state to a theoretically stable state after 35 h of continuous high illumination. Further, the external magnetic field can delay concentration homogenization and improve the heat storage performance of a lower convective zone. A Hartmann number above 56.67 is recommended to enhance the stability of the solar pond. This research sheds new light on methods to improve the long-term stability of solar ponds. © 2021 Elsevier Ltd

Keyword :

Mass transfer Heat storage Lakes Erosion Magnetic fields Stability Heat convection Solar energy Flow of fluids

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GB/T 7714 Tian, D , Qu, Z.G , Zhang, J.F et al. Enhancement of solar pond stability performance using an external magnetic field [J]. | Energy Conversion and Management , 2021 , 243 .
MLA Tian, D et al. "Enhancement of solar pond stability performance using an external magnetic field" . | Energy Conversion and Management 243 (2021) .
APA Tian, D , Qu, Z.G , Zhang, J.F , Ren, Q.L . Enhancement of solar pond stability performance using an external magnetic field . | Energy Conversion and Management , 2021 , 243 .
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Conjugate heat transfer in anisotropic woven metal fiber-phase change material composite EI SCIE
期刊论文 | 2021 , 189 | Applied Thermal Engineering
WoS CC Cited Count: 9
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Abstract :

Latent heat thermal energy storage is an essential technology for addressing the intermittent nature of solar energy, owing to its large energy storage density. However, the low thermal conductivity of phase change material hinders the energy storage efficiency. In the current work, high thermal conductive woven metal fibers are inserted into phase change material to improve its heat transfer rate. The corresponding energy storage process in a latent heat storage unit is investigated, based on pore-scale three-dimensional lattice Boltzmann modeling via numerically reconstructing the fiber morphology. The results indicate that woven metal fibers with optimum porosity should be used to balance the heat transfer capability and energy storage capacity of the woven metal fiber-phase change material composite. In addition, curved woven metal fibers exhibit better thermal performance in a latent heat storage unit than straight woven metal fibers at a high porosity of 0.95. However, straight woven metal fibers are more effective than curved woven metal fibers for enhancing the heat transfer rate of phase change material at a relatively low porosity of 0.90. Importantly, the energy storage rate could be accelerated by 40% through consolidating the anisotropic degree of woven metal fibers with fully unidirectional configuration owing to their enhanced heat transfer in the desired direction. Besides, the heat conduction inside the woven metal fiber-phase change material composite contributes to at least 71.8% of total energy storage amount during conjugate heat transfer, demonstrating its dominant behavior rather than natural convection. Woven metal fibers with designable anisotropic characteristics exhibit evident advantages over isotropic porous media for improving the thermal performance of a latent heat storage unit. © 2021 Elsevier Ltd

Keyword :

Heat conduction Storage (materials) Porosity Thermal conductivity Phase change materials Melt spinning Porous materials Metals Fibers Anisotropy Heat storage Solar energy Latent heat Three dimensional computer graphics

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GB/T 7714 Ren, Qinlong , Wang, Zexiao , Lai, Tao et al. Conjugate heat transfer in anisotropic woven metal fiber-phase change material composite [J]. | Applied Thermal Engineering , 2021 , 189 .
MLA Ren, Qinlong et al. "Conjugate heat transfer in anisotropic woven metal fiber-phase change material composite" . | Applied Thermal Engineering 189 (2021) .
APA Ren, Qinlong , Wang, Zexiao , Lai, Tao , Zhang, J.F , Qu, Z.G . Conjugate heat transfer in anisotropic woven metal fiber-phase change material composite . | Applied Thermal Engineering , 2021 , 189 .
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Pore-scale heat transfer of heat sink filled with stacked 2D metal fiber-PCM composite EI SCIE
期刊论文 | 2021 , 161 | International Journal of Thermal Sciences
WoS CC Cited Count: 4
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Abstract :

Effective thermal management is essential for guaranteeing the working efficiency and safety of several industrial devices. Due to its excellent heat absorption characteristic, microencapsulated phase change material (MEPCM) is promising for thermal management system. However, the drawback of MEPCM's low thermal conductivity seriously hinders the heat dissipation rate from heat sink. Based on their high thermal conductivity and effective interconnected anisotropic heat transfer channels, metal fibers could be inserted into MEPCM to ameliorate its corresponding heat transfer capability. In the current work, novel stacked 2D metal fibers are designed and coupled with MEPCM in order to improve the thermal performance of heat sink. Based on the numerically reconstructed metal fibers, the thermal performance of heat sink assembly filled with MEPCM-metal fiber composite is investigated through pore-scale lattice Boltzmann modelling. When the latent heat of MEPCM is available, the heat sink assembly using anisotropic stacked 2D metal fibers has a less temperature rise compared with that using random metal fibers because of the consolidated heat transfer rate in a desired vertical direction. Furthermore, for an intermittent working heat sink, the MEPCM-stacked 2D metal fiber composite with high anisotropic degree exhibits more obvious advantage on its thermal management owing to the periodically recharged latent heat for further heat absorption. © 2020 Elsevier Masson SAS

Keyword :

Accident prevention Metal working Thermal conductivity Metals Latent heat Temperature control Fibers Heat sinks Melt spinning Phase change materials Anisotropy Heat transfer

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GB/T 7714 Ren, Qinlong , Wang, Zexiao , Zhu, Jianjun et al. Pore-scale heat transfer of heat sink filled with stacked 2D metal fiber-PCM composite [J]. | International Journal of Thermal Sciences , 2021 , 161 .
MLA Ren, Qinlong et al. "Pore-scale heat transfer of heat sink filled with stacked 2D metal fiber-PCM composite" . | International Journal of Thermal Sciences 161 (2021) .
APA Ren, Qinlong , Wang, Zexiao , Zhu, Jianjun , Qu, Z.G . Pore-scale heat transfer of heat sink filled with stacked 2D metal fiber-PCM composite . | International Journal of Thermal Sciences , 2021 , 161 .
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A capacitor-based power equivalent model for salinity-gradient osmotic energy conversion EI SCIE
期刊论文 | 2021 , 250 | Energy Conversion and Management
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Abstract :

Converting the salinity-gradient into electricity via ion migration in nanoconfined channels driven by the salt concentration gap between sea and river water is an important renewable energy utilization method. The osmotic energy conversion device is regarded as a power source with constant voltage output in the conventional constant voltage source (V-source) power equivalent circuit model, which is based on a steady state with constant concentration on both sides of the membrane. In this study, an unsteady equivalent capacitor–capacitor/resistor (C-CR) power equivalent circuit model is proposed to consider the salt concentration variation during actual operation. The maximum relative deviation of the calculated short circuit current between the C-CR power equivalent circuit model and the measured experimental data is 7.06%. The maximum relative deviation of the predicted maximum output power density between the C-CR power equivalent circuit model and the measured experimental data is less than 14.22%, while the corresponding maximum deviation for the V-source power equivalent circuit model has an error of 38.14%. A parallel encapsulation method by embedding graphene oxide membranes (GOMs) into polydimethylsiloxane (PDMS) is provided to offer an extended accessible area for ion transport to enhance the ion flux and output power density. This method reveals a linearly increased output power with the number of GOMs, which provides convenience for increasing output power. This work provides an effective way to design integrated osmotic energy conversion devices, which promotes the development of salinity-gradient-driven energy conversion systems. © 2021 Elsevier Ltd

Keyword :

Circuit simulation Osmosis Timing circuits Polydimethylsiloxane Energy utilization Equivalent circuits Ions Graphene Energy conversion Silicones

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GB/T 7714 Liu, Q , Tang, Z.T , Qu, Z.G et al. A capacitor-based power equivalent model for salinity-gradient osmotic energy conversion [J]. | Energy Conversion and Management , 2021 , 250 .
MLA Liu, Q et al. "A capacitor-based power equivalent model for salinity-gradient osmotic energy conversion" . | Energy Conversion and Management 250 (2021) .
APA Liu, Q , Tang, Z.T , Qu, Z.G , Ren, Qinlong , Zhang, J.F , Tang, R.X . A capacitor-based power equivalent model for salinity-gradient osmotic energy conversion . | Energy Conversion and Management , 2021 , 250 .
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Experimental and numerical study on performance of hybrid refrigeration system that combines vapor compression and thermoelectric systems EI SCIE
期刊论文 | 2021 , 194 | APPLIED THERMAL ENGINEERING
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Abstract :

As high-quality food preservation has become an important aspect of daily life, a need has developed for domestic household refrigerators with a wide refrigeration temperature range. The temperature range of domestic household refrigerators is generally above similar to 20 degrees C. In this study, a hybrid refrigeration system that combined vapor compression refrigeration (VCR) and a thermoelectric refrigerator (TER) is investigated for the freezer compartment of a domestic refrigerator with a volume of 0.018 m(3). Although an additional 99.5 W of electrical power is consumed, a lower temperature of similar to 38.1 degrees C is experimentally achieved in the deep freezer compartment of a compact VCR-TER system, with no noise or mechanical parts. In contrast, a temperature of only similar to 8.8 degrees C is obtained in a typical VCR system. A three-dimensional numerical model is applied to study the performance of the finned heat sink of the TER using FLUENT. The effects of the fin height and fin pitch on the thermal resistance and pressure drop are investigated. The results show that the thermal resistance decreases with an increase in the fin height and increases with an increase in the fin pitch. An optimized firmed heat sink with a fin height of 50 mm is obtained, which has a thermal resistance of 0.05 degrees C/W. It has a higher cooling capacity of 53.6 W than the heat sink with the original fin height of 30 mm. The VCR-TER system has potential application to low-temperature domestic refrigeration systems with a small size and small cooling capacity.

Keyword :

Thermoelectric Low temperature Hybrid refrigeration Peltier effect

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GB/T 7714 Fu, R. P. , Qu, Z. G. , Tao, W. Q. et al. Experimental and numerical study on performance of hybrid refrigeration system that combines vapor compression and thermoelectric systems [J]. | APPLIED THERMAL ENGINEERING , 2021 , 194 .
MLA Fu, R. P. et al. "Experimental and numerical study on performance of hybrid refrigeration system that combines vapor compression and thermoelectric systems" . | APPLIED THERMAL ENGINEERING 194 (2021) .
APA Fu, R. P. , Qu, Z. G. , Tao, W. Q. , Zhu, X. B. , Liu, J. R. . Experimental and numerical study on performance of hybrid refrigeration system that combines vapor compression and thermoelectric systems . | APPLIED THERMAL ENGINEERING , 2021 , 194 .
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Surface roughness dominated wettability of carbon fiber in gas diffusion layer materials revealed by molecular dynamics simulations EI SCIE
期刊论文 | 2021 , 46 (52) , 26489-26498 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
WoS CC Cited Count: 3
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Abstract :

High water contact angle in carbon fiber can facilitate water removal ability of gas diffusion layer (GDL) in proton exchange membrane fuel cells (PEMFCs). Water contact angle is intensively dependent on the surface hydrophobicity of carbon fiber in GDL. In this study, the hydrophobicity of commercial GDL is enhanced through the immersion and hydro thermal methods. The porosity decreases slightly while the surface roughness and surface topology diversity increase significantly in hydrothermal GDL compared with commercial reference and immersion GDL samples. The molecular dynamics simulations show that the water contact angle increases significantly with the increasing surface roughness but varies slightly with different surface topology, indicating that the water contact angle is dominated by the surface roughness. This study's findings are expected to offer an approach that can effectively enhance the water removal capacity by tailoring the surface roughness of carbon fibers in GDL materials. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Water contact angle GDL Molecular dynamics simulations Surface roughness PEMFCs Surface topology

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GB/T 7714 Wang, X. L. , Wang, W. K. , Qu, Z. G. et al. Surface roughness dominated wettability of carbon fiber in gas diffusion layer materials revealed by molecular dynamics simulations [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (52) : 26489-26498 .
MLA Wang, X. L. et al. "Surface roughness dominated wettability of carbon fiber in gas diffusion layer materials revealed by molecular dynamics simulations" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 52 (2021) : 26489-26498 .
APA Wang, X. L. , Wang, W. K. , Qu, Z. G. , Ren, G. F. , Wang, H. C. . Surface roughness dominated wettability of carbon fiber in gas diffusion layer materials revealed by molecular dynamics simulations . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (52) , 26489-26498 .
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A numerical study on the performance of PEMFC with wedge-shaped fins in the cathode channel EI SCIE
期刊论文 | 2021 , 46 (54) , 27700-27708 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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Abstract :

The gas flow field design has a significant influence on the overall performance of a proton exchange membrane fuel cell (PEMFC). A single-channel PEMFC with wedge-shaped fins in the cathode channel was proposed, and the effects of fin parameters such as volume (0.5 mm(3), 1.0 mm(3), and 1.5 mm(3)), number (3, 5, and 9), and porosity of the gas diffusion layer (GDL) (0.2, 0.4, 0.6, and 0.8) on the performance of PEMFC were numerically examined based on the growth rate of power density (GRPD) and polarization curve. It was shown that wedge-shaped fins could effectively improve the PEMFC performance. With an increase in fin volume, the distributions of oxygen mass fraction in the outlet area of the cathode channel were lower, the drainage effect of the PEMFC improved, and GRPD also increased accordingly. Similar results were obtained as the number of fins increased. The GDL porosity had a greater effect than the wedge-shaped fins on the improvement in PEMFC performance, but the influence of GDL porosity weakened and the GRPD of porosity decreased as the porosity increased. This study provides an effective guideline for the optimization of the cathode channel in a PEMFC. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

GRPD Wedge-shaped fins PEMFC Mass transfer enhancement

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GB/T 7714 Zhang, Shuan-yang , Qu, Zhi-guo , Xu, Hong-tao et al. A numerical study on the performance of PEMFC with wedge-shaped fins in the cathode channel [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (54) : 27700-27708 .
MLA Zhang, Shuan-yang et al. "A numerical study on the performance of PEMFC with wedge-shaped fins in the cathode channel" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 54 (2021) : 27700-27708 .
APA Zhang, Shuan-yang , Qu, Zhi-guo , Xu, Hong-tao , Talkhoncheh, Fariborz-Karimi , Liu, Shun , Gao, Qiang . A numerical study on the performance of PEMFC with wedge-shaped fins in the cathode channel . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (54) , 27700-27708 .
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