文献类型：期刊文献

英文题名：Investigation of Droplet Dynamic Behavior in Pemfcs Gas Diffusion Layer and Gas Channel with Micro-Ct and Lattice Boltzmann Method

作者：Lv, Xuecheng[1]; Zhou, Zhifu[2]; Wu, Wei-Tao[3]; Wei, Lei[4]; Gao, Linsong[5]; Lyu, Jizu[6]; Hu, Chengzhi[1]; Li, Yang[1]; Li, Yubai[1]; Song, Yongchen[1]

机构：[1] Key Laboratory of Ocean Energy Utilization and Energy Conservation of 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 and Mechanics, Xiangtan University, Xiangtan, 411105, China; [6] School of Mechanical Engineering, Guangdong Ocean University, Zhanjiang, 524088, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240156530)

语种：英文

外文关键词：Computerized tomography - Diffusion in gases - Ductile fracture - Flow of gases - Gases - Kinetic theory - Phase interfaces - Proton exchange membrane fuel cells (PEMFC)

外文摘要：This study reconstructed the 3D structure for the gas diffusion layer (GDL) of proton exchange membrane fuel cells (PEMFCs) using the micro-CT technique and investigated the dynamic behavior of droplets inside the multi-scale space of GDL and gas channel (GC) using the lattice Boltzmann method (LBM). The prediction model for droplet detachment at the GDL-GC interface was developed. The results indicate that there is a significant difference between the breakage location of the liquid bridge and the trajectory of the liquid droplet after detaching from the GDL-GC interface in the multi-scale space of GC and GDL, compared to the single-scale GC space where GDL is ignored. The increase in gas velocity and internal contact angle of the GDL contribute to reducing the droplet detachment volume and increasing the droplet detachment frequency. At the internal contact angle of 120o-140o, GDL exhibited the most efficient removal of liquid water. A contact angle smaller than this range would hinder the detachment of droplets in the GC, while a contact angle larger than this range would lead to the accumulation of liquid water in the GDL. The surface force generated by the connection of liquid bridges in the analytical model for critical droplet detachment forms an angle with the gas flow direction, with the characteristic length determining this force being the minimum diameter at the necking of the liquid bridge. ? 2024, The Authors. All rights reserved.