Abstract
Diffusion is an important mechanism for high temperature polymer electrolyte fuel cells. In this paper, a three-dimensional computational fluid dynamics model with different mass transfer formulations was developed and applied to an existing design. The solution of the inverted form of the Maxwell-Stefan equations (generalized Fick's law) was compared with the multi-component form of Fick's law in the channels and gas diffusion layers of a typical high temperature polymer electrolyte fuel cell. It was found that the deviation between the two sets of results was relatively small. A preliminary water transfer model was implemented to calculate the water cross over.
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