Abstract
To address the problems of uneven mass distribution and hydrothermal management imbalance in flow fields, this study proposes a snowflake slope composite flow field (SSCFF). A three-dimensional multiphase computational fluid dynamics (CFD) model was developed to analyze the differences between the SSCFF and traditional flow fields, and to investigate the effects of gas inlet and outlet configurations, height ratios (Ld/D), and the number of main channels (N) on the performance. The study shows that the SSCFF excels in gas distribution and temperature control, with a maximum power density 35.5% higher than the honeycomb structure. The diagonal inlet and outlet configuration effectively reduces the risk of local hotspots and flooding. With Ld/D of 0.9, the uniformity of oxygen distribution improves significantly and the current density reaches 1.168 A cm−2. Additionally, with 6 main channels, the proton exchange membrane (PEM) achieves a higher hydration level, which boosts catalytic activity and working efficiency.
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