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首页> 外文期刊>Energy Conversion & Management >Channel to rib width ratio influence with various flow field designs on performance of PEM fuel cell
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Channel to rib width ratio influence with various flow field designs on performance of PEM fuel cell

机译：通道与肋的宽度比以及各种流场设计对PEM燃料电池性能的影响

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摘要

A three dimensional (CFD) model is applied to investigate the effect of geometry designs and dimensions of the flow field on the performance of PEM fuel cells with an area of 5.1 x 5.1 cm(2) and composed of 25 channels. Three designs including serpentine, interdigitated and parallel with six channel to rib width ratios defined as (eta = channel width/rib width) have been analyzed. In order to keep the area of the cell and number of channels constant, when the width of the channel increases the width of the ribs decreases and vice versa for a comparative purpose. At high operating voltage, the geometric designs and channel to rib width ratios have little influence on cell performance while at low operating voltage, it affects considerably the cell performance. The PEM fuel cell with serpentine designs has better performance. It increases by 4.6% and 39.1% compared to interdigitated and parallel, respectively. Moreover, decreasing channel width and increasing rib width improve cell performance. It increases up to 120% for serpentine, 45% for interdigitated and 23% for parallel when channel to rib width ratio decreases from 2.66 to 0.25. The local transport phenomena have been also analyzed. The pressure drop and under rib convection increase with decreasing channel to rib width ratio, which results in high reactants speed under the ribs and more homogenous local transport phenomena in the catalysts layer; enhancing the net power density.
机译：应用三维（CFD）模型来研究几何设计和流场尺寸对PEM燃料电池性能的影响，PEM燃料电池的面积为5.1 x 5.1 cm（2），由25个通道组成。分析了三种设计，包括蛇形，交错式和平行式，六个通道与肋骨的宽度比定义为（eta =通道宽度/肋骨宽度）。为了保持单元的面积和通道数量恒定，出于比较目的，当通道的宽度增加时，肋的宽度减小，反之亦然。在高工作电压下，几何设计和沟道与肋的宽度比对电池性能几乎没有影响，而在低工作电压下，它会显着影响电池性能。蛇形设计的PEM燃料电池具有更好的性能。与叉指和并行相比，它分别增加了4.6％和39.1％。此外，减小沟道宽度和增大肋宽度可改善电池性能。当通道与肋骨的宽度比从2.66降低至0.25时，蛇形的最大增加为120％，叉指的最大为45％，平行的最大为23％。还分析了局部运输现象。压力降和肋骨对流下的压力下降随通道与肋骨的宽度比的减小而增加，这导致肋骨下的反应物速度较高，并且催化剂层中的局部输运现象更加均匀。提高净功率密度。

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