• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Impacts of the mixed wettability on liquid water and reactant gas transport through the gas diffusion layer of proton exchange membrane fuel cells
【24h】

Impacts of the mixed wettability on liquid water and reactant gas transport through the gas diffusion layer of proton exchange membrane fuel cells

机译：混合润湿性对液态水和反应气体通过质子交换膜燃料电池气体扩散层的传输的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, we develop a pore network model for liquid water and reactant gas transport through the porous gas diffusion layer (GDL) of mixed wettability. We first consider the case of uniform distribution of hydrophilic fraction along the GDL thickness. It is revealed that the addition of hydrophilic pores has a negligible impact on liquid saturation profile when the hydrophilic fraction is low (≤0.2), whereas in the case of higher hydrophilic fraction (≥0.4), a flat shape of liquid saturation profile is observed along the GDL thickness. The total liquid saturation in the GDL is found to first decrease and then increase with the increase of hydrophilic pores; and an optimum hydrophilic fraction exists leading to the maximum limiting current density. Also, we investigate the transport process in the GDL of non-uniform wettability (i.e., the hydrophilic fraction is 0.4 near the network inlet, while at the downstream region it is 0.3). As compared to the uniform case, the liquid saturation level at the downstream region is drastically decreased in the non-uniform system, thereby leading to a higher limiting current density. These findings suggest that the fuel cell performance can be improved by designing the GDL with appropriate wettability distribution.
机译：在本文中，我们建立了一个液体网络和反应气体通过混合润湿性的多孔气体扩散层（GDL）传输的孔隙网络模型。我们首先考虑亲水部分沿GDL厚度均匀分布的情况。结果表明，当亲水分数低（≤0.2）时，增加亲水孔对液体饱和度的影响可以忽略不计；而在亲水分数高（≥0.4）的情况下，则观察到平坦的液体饱和度曲线沿着GDL厚度。发现GDL中的总液体饱和度首先随着亲水孔的增加而降低，然后增加。存在最佳亲水分数，从而导致最大极限电流密度。此外，我们研究了在GDL中润湿性不均匀的传输过程（即，在网络入口附近的亲水分数为0.4，而在下游区域的亲水分数为0.3）。与均匀情况相比，在非均匀系统中，下游区域的液体饱和度大大降低，从而导致更高的极限电流密度。这些发现表明，通过设计具有适当润湿性分布的GDL可以改善燃料电池的性能。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第10期|p.2581-2589|共9页
  • 作者

    Rui Wu; Qiang Liao; Xun Zhu; Hong Wang;

  • 作者单位

    Key Laboratory ofLow-Crade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400030, China;

    Key Laboratory ofLow-Crade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400030, China;

    Key Laboratory ofLow-Crade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400030, China;

    Key Laboratory ofLow-Crade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400030, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    proton exchange membrane fuel cell; gas diffusion layer; mixed wettability; pore network modeling; liquid water transport; oxygen diffusion;

    机译：质子交换膜燃料电池气体扩散层混合润湿性孔网模拟液态水传输氧扩散;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号