A complete three-dimensional and single phase model for proton exchange membrane (PEM) fuel cells is used to investigate the effect of using different channels geometry on the performances, current density and gas concentration. The proposed model is a full cell model, which includes all the parts of the PEM fuel cell, flow channels, gas diffusion electrodes, catalyst layers and the membrane. Coupled transport and electrochemical kinetics equations are solved in a single domain; therefore no interfacial boundary condition is required at the internal boundaries between cell components. This computational fluid dynamics code is used as the direct problem solver, which is used to simulate the three-dimensional mass, momentum, energy and species transport phenomena as well as the electron- and proton-transfer process taking place in a PEMFC. The results show that the predicted polarization curves by using this model are in good agreement with the experimental results and a high performance was observed by using circle geometry for the channels of anode and cathode sides. Also the results show that the performance of the fuel cell improved by using the rectangular channel than the elliptical and triangular channels.

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