文献类型：期刊文献

英文题名：Modeling of Gas Transport in Liquid Water Filled Pemfc Gas Diffusion Layer Facilitated by X-Ray Ct Imaging

作者：Liu, Hang[1]; Lv, Xuecheng[1]; Huang, Heng[1]; Li, Yang[1]; Zhou, Zhifu[2]; Wu, Wei-Tao[3]; Wei, Lei[4]; Jizu, Lyu[5]; Li, Yubai[1]; Song, Yongchen[1]

机构：[1] Key Laboratory of Ocean Energy Utilization and Energy Conservation, Ministry of Education, Dalian University of Technology, Dalian, 116024, China; [2] State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi’an, 710049, China; [3] School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; [4] Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; [5] School of Mechanical Engineering, Guangdong Ocean University, Zhanjiang, 524088, China

年份：2025

外文期刊名：SSRN

收录：EI(收录号：20250326843)

语种：英文

外文关键词：Computerized tomography - Diffusion in gases - Gas permeable membranes - Gases - Porous materials

外文摘要：Mass transport polarization induced by water blockage within the gas diffusion layer (GDL) of proton exchange membrane fuel cells (PEMFCs) constitutes a critical bottleneck limiting high-current-density performance. This study establishes a model of water invasion under compression and thickness changes, facilitated by in-situ X-ray computed tomography (X-CT) imaging and finite element modeling based on realistic geometric structures. Subsequently, it investigates the gas transport under liquid saturation. Extraction of the pore network model (PNM) reveals that both compression and water flooding significantly reduce the mean pore diameter, while exerting minimal impact on the coordination number. The results indicate that liquid water transport pathways exhibit scale-dependent characteristics. Furthermore, the effective diffusion coefficient (EDC) and permeability (K) vary linearly with thickness. Notably, 40% compression causes an 80% reduction in permeability, while significantly mitigating the pressure drop phenomenon. This work provides multiscale insights into mass transport limitations across various porous media. ? 2025, The Authors. All rights reserved.