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首页> 外文期刊>International Journal of Heat and Mass Transfer >Liquid water in cathode gas diffusion layers of PEM fuel cells: Identification of various pore filling regimes from pore network simulations
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Liquid water in cathode gas diffusion layers of PEM fuel cells: Identification of various pore filling regimes from pore network simulations

机译：PEM燃料电池阴极气体扩散层中的液态水：通过孔网络模拟识别各种孔填充方式

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摘要

A pore network model (PNM) aiming at simulating the liquid water pore filling in the cathode gas diffusion layer (GDL) in an operating PEM-fuel cell is presented. Compared to previous works, the model allows simulating a significantly larger range of operating regimes. It notably allows considering the situation where the channel gas is fully humidified both for low temperature operating conditions (similar to 40 degrees C) and standard temperature operating conditions (similar to 80 degrees C) as well as for intermediate operating temperatures. The model leads to results in good agreement with several experimental observations from the literature. This allows defining a regime diagram summarizing the main operating regimes identified in the course of the study, namely the dry regime, the dominant condensation regime, the dominant liquid injection regime, the mixed regime where both the capillarity controlled invasion in liquid phase from the adjacent layer and condensation are important. The proposed model opens up new perspectives for understanding the water transfer in proton exchange membrane fuel cells and the associated water management and performance degradation issues. (C) 2018 Elsevier Ltd. All rights reserved.
机译：提出了一种孔隙网络模型（PNM），其目的是模拟运行中的PEM燃料电池中阴极气体扩散层（GDL）中的液态水孔隙填充。与以前的工作相比，该模型可以模拟更大范围的运行方式。特别地，这允许考虑以下情况：在低温操作条件（类似于40摄氏度）和标准温度操作条件（类似于80摄氏度）以及中间操作温度下，通道气体已被完全加湿。该模型的结果与文献中的一些实验观察结果吻合良好。这允许定义一个方案图，该方案图总结了研究过程中确定的主要操作方案，即干燥方案，主要冷凝方案，主要液体注入方案，混合方案，其中毛细管现象均控制了相邻色谱柱的液相入侵层和冷凝很重要。提出的模型为理解质子交换膜燃料电池中的水转移以及相关的水管理和性能下降问题开辟了新的视角。 （C）2018 Elsevier Ltd.保留所有权利。

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