化工学报 ›› 2017, Vol. 68 ›› Issue (S1): 83-89.DOI: 10.11949/j.issn.0438-1157.20170610

• 流体力学与传递现象 • 上一篇    下一篇

直接甲醇燃料电池阴极水的传输特性

蒋静慧1,2, 巩亮1, 李印实2   

  1. 1. 中国石油大学(华东)储运与建筑工程学院热能工程系, 山东 青岛 266580;
    2. 西安交通大学能源与动力工程学院, 热流科学与工程教育部重点实验室, 陕西 西安 710049
  • 收稿日期:2017-05-15 修回日期:2017-05-23 出版日期:2017-08-31 发布日期:2017-08-31
  • 通讯作者: 巩亮,lgong@upc.edu.cn

Transmission characteristics of cathode water in direct methanol fuel cell

JIANG Jinghui1,2, GONG Liang1, LI Yinshi2   

  1. 1. Department of Thermal Engineering, College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
    2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
  • Received:2017-05-15 Revised:2017-05-23 Online:2017-08-31 Published:2017-08-31

摘要:

利用COMSOL Multiphysics软件对直接甲醇燃料电池(DMFC)阴极模型进行计算,获得压力、速度、水、氧气和液态饱和度分布情况,研究扩散层在不同物理参数(如厚度、孔隙率、孔径大小和亲憎水性)下电池阴极水和氧气的传输情况,进一步建立扩散层孔隙率梯度的数学模型,研究扩散层孔隙率梯度以及支撑层参数对直接甲醇燃料电池性能和物质传输的影响。结果表明,扩散层具有大孔隙率、薄扩散层时均有利于氧气传质,可以使电池性能提高;扩散层孔隙率梯度的存在可以减轻氧气传输阻力,提高电池性能。

关键词: 燃料电池, 相变, 多孔介质, 传质, 数值模拟

Abstract:

The characteristic of cathode water transport in direct methanol fuel cell was investigated using COMSOL Multiphysics,including the effect of the distribution of pressure,velocity,water,oxygen and liquid saturation,as well as diffusion layer under different physical parameters,such as thickness,porosity,size and hydrophobicity. A further mathematical model of diffusion layer with gradient porosity distribution was established to study the effect of porosity gradient and support layer parameters on cell performance and mass transfer. The results show that the diffusion layer with high porosity and thin layer is beneficial to oxygen transfer. The gradient porosity distribution of diffusion layer can reduce oxygen transport resistance,and thus improving the cell performance.

Key words: fuel cell, phase change, porous media, mass transfer, numerical simulation

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