Lattice Boltzmann Simulation of Gas Component Reaction and Transfer in PEMFC Diffusion Layer
The multi-component Shan-Chen model in the lattice Boltzmann method is used to model the characteristic structures of the gas diffusion layer and the bipolar plate flow channel of the fuel cell,and the effects of different porosities,compression ratios,and the location of the waterlogged droplets on the transfer of the gas components in the proton exchange membrane fuel cell(PEMFC)are investigated.The simulation results show that the small porosity will cause the blockage of gas,which affects the mass transfer efficiency,and the compression effect of the gas diffusion layer leads to the deformation of the structure and then causes the blockage of gas at the inlet of the flow channel;the compression leads to the narrowing of the gas channel,which promotes the oxygen to contact the catalytic layer in the lower part of the catalytic layer for the reaction,and the intensity of the reaction in the vicinity of the flow channel increases with the compression ratio;when the water droplets are located in the middle of the diffusion layer,they can direct part of the reacting gas to the catalytic layer,thus increasing the concentration of the reacting gas;while the droplets located at the bottom will cover the catalyst and thus hinder the catalytic reaction.
proton exchange membrane fuel cellgas diffusion layerlattice Boltzmann methodcompression effectdroplet of accumulated water
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