Abstract
Liquid water accumulates inside polymer electrolyte fuel cells (PEFCs) prevents gas transport and degrades the cell performance. In this study, we performed an unsteady numerical simulation of water condensation and accumulation in the gas diffusion layer (GDL) of PEFCs using the three-dimensional structure of the GDL obtained by X-ray CT measurement. The temperature and gas concentration fields were solved to obtain the amount of condensation, and the volume of fluid (VOF) method was used for the transport of the gas-liquid interface. As a result of the simulation, the region where condensation occurs was identified and the formation mechanisms of the liquid-water structure is observed.
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