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Two-phase flow dynamics in a gas diffusion layer - gas channel - microporous layer system
Journal of Power Sources ( IF 9.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jpowsour.2020.228427
Daniel Niblett , Adrian Mularczyk , Vahid Niasar , Jens Eller , Stuart Holmes

We have shown in our former study [1] that ordered microstructures can improve the effective electrical conductivity and permeability in the gas diffusion layer (GDL). However, the effect of ordered structures on the dynamics of gas-water dynamics in porous layers of fuel cells was not studied.

Water management within fuel cell porous transport layers is a key challenge for improving performance. When liquid water accumulates at high current density, the oxygen diffusion resistance is increased. This study investigates the effect of GDL, microporous layer (MPL) and gas channel (GC) structure on the liquid water percolation and detachment in the channel. Dynamic two-phase flow simulations have been performed using OpenFOAM® with the Volume of Fluid (VoF) method to evaluate the water distribution in 2D and 3D ordered and disordered porous media. This study highlights the importance of pore morphology on improving the two-phase flow dynamics. The simulation approach was compared to x-ray micro computed tomography data of water injected into a GDL with detachment in the channel, which showed a high level of agreement. The effects of GDL pore morphology, defects in the MPL and interaction between GDL and GC on the water dynamics in the system have been studied.



中文翻译:

气体扩散层-气体通道-微孔层系统中的两相流动动力学

我们在以前的研究中已经证明[1],有序的微结构可以改善气体扩散层(GDL)中的有效电导率和渗透率。然而,没有研究有序结构对燃料电池多孔层中气水动力学的影响。

燃料电池多孔传输层内的水管理是提高性能的关键挑战。当液态水以高电流密度积聚时,抗氧扩散性增加。本研究探讨了GDL,微孔层(MPL)和气体通道(GC)结构对通道中液体水的渗透和分离的影响。使用OpenFOAM®和流体体积(VoF)方法进行了动态两相流动模拟,以评估2D和3D有序和无序多孔介质中的水分布。这项研究强调了孔形态对改善两相流动力学的重要性。将模拟方法与注入通道中脱离的GDL中的水的X射线微计算机断层扫描数据进行了比较,这显示出很高的一致性。

更新日期:2020-07-01
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