Mass transfer performance of PEMFC cathode flow field with blockage structure
A proton exchange membrane fuel cell (PEMFC) cathode flow field model with the blockage structure is established. The effects of blockage arrangement (above,below,in an alternating pattern) and porosity on the gas flow characteristics (velocity,pressure and oxygen molar concentration) in the flow channel and diffusion layer,as well as the mass transfer in the vertical direction to the channel of the front,middle,and rear blockage sections in the middle and outlet of channel are analyzed.The movement characteristics of liquid water in flow fields with different blockage heights are analyzed by visual experiment.When rectangular blockages are placed above the channel,better mass transfer performance in the vertical direction to the channel is achieved in the middle and outlet of the front,middle and rear blockage sections;positioning rectangular blockages above the channel accelerates the discharge of liquid water.When the blockage height is 50％ of the channel height,the grayscale values of most droplets in the flow field are 40-70,causing blockages in the channel.When the blockage height is 70％ of the channel height,the grayscale values of most droplets are 70-90,and a significant number of droplets are distributed at the outlet of the channel,resulting in smoother discharge of liquid water.
proton exchange membrane fuel cell(PEMFC)channelblockagemass transferliquid water
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