Study on water transport in PEM of a direct methanol fuel cell |
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Authors: | M.H. Shi J. WangY.P. Chen |
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Affiliation: | Department of Power Engineering, Southeast University, Nanjing 210096, PR China |
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Abstract: | Water transport phenomenon in PEM and the mechanism of occurrence and development of a two-phase countercurrent flow with corresponding transport phenomenon in the PEM are analyzed. A one-dimensional steady state model of heat and mass transfer in porous media system with internal volumetric ohmic heating is developed and simulated numerically. The results show that two dimensionless parameters D and N, which reflect the liquid water flow rate and inner heat source in the PEM, respectively, are the most important factors for the water fraction and thermal balance in the PEM. The saturation profiles within the two-phase region at various operating modes are obtained. Smaller mass flow rate of liquid water and high current density are the major contributions to the membrane dehydration. |
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Keywords: | Direct methanol fuel cell Porous media Water transport Dry-out Two-phase flow |
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