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Effects of Cracks on the Mass Transfer of Polymer Electrolyte Membrane Fuel Cell with High Performance Membrane Electrode Assembly

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Journal of Wuhan University of Technology(Materials Science) 2021年第3期36卷 318-330页

作者： SHI Jinrong ZHAN Zhigang ZHANG Di YU Yuan YANG Xiaoxiang HE Luyan PAN Mu Foshan Xianhu Laboratory Foshan 528000China State Key Laboratory of Advanced Technology for Materials Synthesis and Pro-cessing Wuhan University of TechnologyWuhan 430070China

A two-dimensional geometric model is developed for a polymer electrolyte based on the liquid water penetration mechanism in the membrane electrode assemblies under the action of capillary *** effects of the diameter,number,and distribution of cracks in the micro-pore layers(MPLs)of the modeled MEA on the performance of the PEMFC are simulated to investigate the influence of mass transfer across the *** results indicate that liquid water in the catalyst layer(CL)of the MEA can be discharged to gas channels through the cracks in MEA under the action of capillary pressure,thereby alleviating the flooding in the CL and enhancing the diffusion of oxygen to the *** the proportion of the total area of cracks in the active area of the MEA was 8%-12%,crack diameter was 20-30μm,and cracks were distributed *** with and without cracks were prepared,fuel cells were assembled,and their performance was *** effects of cracks on mass transfer were then *** study helps prepare MEAs with controllable cracks.

关键词： PEMFC MEA cracking liquid saturation oxygen concentration transfer

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An Improvement on the Method for Calculating the Capillary Limit of Axial-Grooved Heat Pipes

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Journal of Thermal Science 1993年第4期2卷 248-253页

作者： ChenHanzhuo MaTongze InstituteofEngineeringThermophysics ChineseAcademyofSciences.P.O.Box2706Beijing100080China Institut

A new model has been developed to predict the capillary limit of axial-grooved heat *** the model the concepts of liquid saturation or liquid fraction of the cross-sectional area of groove,the modified relative permeability,absolute permeability of groove and Leverrt’s function are *** Leverrt’s function is well represented by the function f（s）=(1/51/2)（1/s-1）*** the model the effects of gravitational force,capillary force and viscous force are *** calculated results are in good agreement with existing experimental data reported in the literature.

关键词： liquid saturation relative permeability capillary limit

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Effect of Distributor Design on Gas-liquid Distribution in Monolithic Bed at High Gas/liquid Ratios

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Chinese Journal of Chemical Engineering 2012年第4期20卷 693-700页

作者：周媛 AL-DAHHAN Muthanna DUDUKOVIC Milorad 刘辉 Beijing University of Chemical Technology Missouri University of Science and Technology RollaMO 65409USA Washington University in St.Louis MO 63130USA

Experiments were carried out to investigate the liquid flow distribution at high gas/liquid ratios in a cold model monolith bed of a 0.048 m diameter with 62 cells per *** types of distributor for the liquid distribu-tion were used to evaluate their distribution *** liquid saturation in individual channels was meas-ured using 16 single-point optical fiber probes mounted inside the *** results indicate that 1) The optical fiber probe technique can measure phase distribution in the monolith bed;2) liquid saturation distribution along the radial direction of the monolith bed is not uniform and the extent of non-uniformity depends on the distributor de-sign and phase velocities;and 3) The tube array distributor provides superior liquid distribution performance over the showerhead and nozzle distributors.

关键词： monolith reactor phase distribution optical fiber probe liquid saturation

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