This study develops an improved flow field design by incorporating micro-guide blocks into a traditional straight channel. The guide blocks are arranged in a staggered manner within the flow field to induce airflow disturbances
promoting convective mass transfer and enhancing the transport of reactant gases. A three-dimensional
steady-state
non-isothermal two-phase model of a PEMFC with the novel guide block flow field was developed using the CFD method. The study systematically investigated the output performance
oxygen mass fraction
and gas flow velocity of the fuel cell. The quantitative analysis was conducted to evaluate the impact of the number of guide blocks on fuel cell performance and compared the results with a traditional straight channel PEMFC.The results elucidate the mechanism by which the improved flow field enhances the output performance of the PEMFC. The flow channel with 8 flow-guide blocks
compared to the traditional straight flow channel
shows an 18.73% increase in maximum current density and an 8.46% improvement in the peak power density of the fuel cell
achieving a net power density of 0.6208 W/cm.
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references
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