Abstract
A capillary pressure modeling based on the gradient-diffusion assumption is investigated for simulating water saturation processes in the gas diffusion layer in the polymer electrolyte fuel cell. Leverett function which traditionally applied to the gradient-diffusion assumption based on the experimental data can be approximated by the beta function, considering a probability density of pore size distribution in GDL. It indicates a designing method of GDL and also a dependency of Leverett function on the measuring scale or the simulating resolution.
