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材料导报  2022, Vol. 36 Issue (13): 20120143-6    https://doi.org/10.11896/cldb.20120143
  无机非金属及其复合材料 |
燃料电池气体扩散层的分形模型研究
王昌进, 张赛*, 徐静磊
昆明理工大学机电工程学院,昆明 650500
Study on Fractal Model of Fuel Cell Gas Diffusion Layer
WANG Changjin, ZHANG Sai*, XU Jinglei
Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China
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摘要 气体扩散层(GDL)是燃料电池的重要组成部分,一般是以碳纸为材料的一种多孔介质,其内部结构在一定尺度范围内表现出分形特征。本工作基于分形理论、菲克定律、气体扩散层表面特性和气液两相流动规律建立了关于气体扩散系数的分形模型。研究结果表明:有效扩散系数与面积分形维数、孔隙率成正比,与迂曲度分形维数、液相饱和度成反比。通过比较模型预测的气体有效扩散系数与已有实验数据发现,气体扩散层的表面特性即亲水性和疏水性对扩散系数的影响较大,在较低液相饱和度情况下,经过疏水处理的扩散层的气体扩散性能明显优于亲水扩散层。新建立的气体扩散系数模型可准确描述气体扩散层中的扩散规律,对气体扩散层的设计具有一定的指导意义。
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王昌进
张赛
徐静磊
关键词:  气体扩散层  分形理论  液相饱和度  表面特性    
Abstract: Gas diffusion layer (GDL) is an important part of fuel cell. It is a porous medium made of carbon paper. Its internal structure shows fractal characteristics in a certain scale. Based on the fractal theory, Fick's law, the surface characteristics of gas diffusion layer and the law of gas-liquid two-phase flow, a mathematical model of gas diffusion coefficient was established. The results show that the effective diffusion coefficient is directly proportional to area fractal dimension and porosity, and inversely proportional to tortuosity fractal dimension and liquid saturation. By comparing the effective diffusion coefficient predicted by the mathematical model with the existing experimental data, it is found that the surface characteristics of the gas diffusion layer, i.e. hydrophilicity and hydrophobicity, have a great influence on the diffusion coefficient. In the case of low liquid saturation, the gas diffusion performance of the hydrophobic-treated diffusion layer is obviously better than that of the hydrophilic diffusion layer. The new mathematical model of gas diffusion coefficient can accurately describe the diffusion law in the gas diffusion layer, which has a certain guiding significance for the design of gas diffusion layer.
Key words:  gas diffusion layer    fractal theory    liquid saturation    surface characteristics
出版日期:  2022-07-10      发布日期:  2022-07-12
ZTFLH:  TK121  
基金资助: 云南省科学技术厅青年基金(KKSQ201701008)
通讯作者:  * sai_zh@163.com   
作者简介:  王昌进,2018 年 6 月本科毕业于四川农业大学机电学院。现为昆明理工大学机电工程学院硕士研究生,目前主要从事多孔介质传热传质理论研究。
张赛,昆明理工大学机电工程学院讲师,本科毕业于武汉科技大学,获工学学士学位,研究生毕业于昆明理工大学,获工学硕士、工学博士学位。主要从事多孔介质传热传质方面的研究,探求在微观结构视角下热量传递和质量传递的规律。
引用本文:    
王昌进, 张赛, 徐静磊. 燃料电池气体扩散层的分形模型研究[J]. 材料导报, 2022, 36(13): 20120143-6.
WANG Changjin, ZHANG Sai, XU Jinglei. Study on Fractal Model of Fuel Cell Gas Diffusion Layer. Materials Reports, 2022, 36(13): 20120143-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.20120143  或          http://www.mater-rep.com/CN/Y2022/V36/I13/20120143
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