Effects of the channel-land configuration (CLC) on the temperature-driven (TD) flow have been seldom examined. In this work, a 2-D, non-isothermal, two-phase model incorporating an agglomerate sub-model is established, considering the compression effect and gas diffusion layer (GDL) anisotropy. Results show that the TD flow flux of the through-plane (TP) direction, JTD,TP, is much higher than that of the in-plane direction (JTD,IP) by an order of magnitude. The TD flow is mainly one-dimensional along the TP direction. There are significant differences in the TD flow between the channel and land region. Besides, JTD,TP at the junction of the land region and channel region shows step changes due to the compression effect. After the current loading, the output voltage experiences an undershoot and then undergoes a slow rising and gradual falling process until remaining stable. It is found that the membrane water directly affects the dynamic behaviors of the output voltage. Increasing the inlet relative humidity helps to improve the dynamic response characteristic. JTD,TP also reveals an increasing trend with time after current step loading, contributing to the transition from membrane water to water vapor. This work aims to provide valuable references for better CLC design and satisfactory water management.

中文翻译：

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通道-地盘构型对质子交换膜燃料电池阴极气体扩散层中温度驱动输水的影响


通道-陆地配置 （CLC） 对温度驱动 （TD） 流的影响很少被研究。在这项工作中，考虑了压缩效应和气体扩散层 （GDL） 各向异性，建立了一个包含团聚子模型的二维非等温两相模型。结果表明，通过面 （TP） 方向的 TD 流通量 JTD，TP 远高于面内方向的 TD 流通量 （JTD，IP） 一个数量级。TD 流动主要是沿 TP 方向的一维流动。河道和陆地区域之间的 TD 流存在显著差异。此外，由于压缩效应，土地区域和通道区域交界处的 JTD，TP 表现出阶跃变化。在电流加载之后，输出电压会经历一个下冲，然后经历一个缓慢的上升和逐渐下降的过程，直到保持稳定。研究发现，膜水直接影响输出电压的动态行为。增加入口相对湿度有助于改善动态响应特性。JTD，TP 还揭示了当前阶跃加载后随时间增加的趋势，有助于从膜水到水蒸气的转变。这项工作旨在为更好的 CLC 设计和令人满意的水资源管理提供有价值的参考。