Binary molecular diffusion and pressure driven fluxes of gas in porous media have been studied. A 2-dimensional model of gas transport in porous media in the field of nonzero gradients of pressure and concentration has been developed. Spatial distributions of oxygen concentration and fluxes in a porous diffuser of a polymer electrolyte hydrogen fuel cell have been analyzed as a function of geometric and physical parameters of the electrode. 3-dimensional generalization of the model has been performed. Possible application to oxygen flow modeling in electrodes of polymer electrolyte fuel cells has been discussed for two simple configurations of gas supply channels, i.e., serpentine and interdigitated.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
$^1$Department of Optics
$^2$Department of Theoretical Physics
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