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A novel flow field with controllable pressure gradient to enhance mass transport and water removal of PEM fuel cells
AIChE Journal ( IF 3.7 ) Pub Date : 2020-02-27 , DOI: 10.1002/aic.16957
Lei Xing 1, 2 , Yuanxiang Xu 1 , Željko Penga 3, 4 , Qian Xu 5 , Huaneng Su 5 , Weidong Shi 6 , Frano Barbir 3, 4
Affiliation  

An easily machined novel flow field with controllable pressure gradient across adjacent channels was designed and a two dimensional, across‐the‐channel, two‐phase model was developed to study the gas transport and water removal of the novel configuration. The effect of channel‐rib width ratio, GDL thickness and pressure gradient on the profiles of oxygen concentration and water saturation within the GDL were investigated. Special attention was paid to the mechanisms of the promoted mass transport and water removal rates under a pressure gradient. The model was validated by experiments with various channel‐rib ratios and GDL thicknesses at different operating pressure. The results revealed that, oxygen concentration was increased, and the water saturation was reduced under the rib with a pressure gradient generated across the adjacent channels. The optimal pressure gradient is between 0.1 to 0.2 atm for the studied channel geometry and configuration. The mechanisms of the improved cell performance were elucidated.

中文翻译:

具有可控压力梯度的新型流场,可增强PEM燃料电池的质量传输和除水能力

设计了一种易于加工的新型流场,该流场具有跨相邻通道可控的压力梯度,并开发了二维,跨通道两相模型来研究新型结构的气体输送和除水效果。研究了通道肋宽比,GDL厚度和压力梯度对GDL内氧气浓度和水饱和度分布的影响。特别注意在压力梯度下提高的质量传输和除水速率的机制。通过在不同的工作压力下使用各种通道肋比率和GDL厚度的实验对模型进行了验证。结果表明,肋骨下的氧气浓度增加,水饱和度降低,并且在相邻通道之间产生压力梯度。对于研究的通道几何形状和配置,最佳压力梯度在0.1至0.2 atm之间。阐明了改善电池性能的机理。
更新日期:2020-02-27
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