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Stochastic modeling and direct simulation of the diffusion media for polymer electrolyte fuel cells

机译：聚合物电解质燃料电池扩散介质的随机建模和直接模拟

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摘要

This paper combines the stochastic-model-based reconstruction of the gas diffusion layer (GDL) of polymer electrolyte fuel cells (PEFCs) and direct simulation to investigate the pore-level transport within GDLs. The carbon-paper-based GDL is modeled as a stack of thin sections with each section described by planar two-dimensional random line tessellations which are further dilated to three dimensions. The reconstruction is based on given GDL data provided by scanning electron microscopy (SEM) images. With the constructed GDL, we further introduce the direct simulation of the coupled transport processes inside the GDL. The simulation considers the gas flow and species transport in the void space, electronic current conduction in the solid, and heat transfer in both phases. Results indicate a remarkable distinction in tortuosities of gas diffusion passage and solid matrix across the GDL with the former ～1.2 and the latter ～13.8. This difference arises from the synthetic microstructure of GDL, i.e. the lateral alignment nature of the thin carbon fiber, allowing the solid-phase transport to occur mostly in lateral direction. Extensive discussion on the tortuosity is also presented. The numerical tool can be applied to investigate the impact of the GDL microstructure on pore-level transport and scrutinize the macroscopic approach vastly adopted in current fuel cell modeling.
机译：本文将基于随机模型的聚合物电解质燃料电池（PEFC）气体扩散层（GDL）重建与直接模拟相结合，以研究GDL中的孔隙水平传输。基于碳纸的GDL被建模为一堆薄片，每个部分都由平面二维随机线镶嵌图描述，并进一步扩展为三个维度。重建基于通过扫描电子显微镜（SEM）图像提供的给定GDL数据。通过构造的GDL，我们进一步介绍了GDL内部耦合传输过程的直接仿真。该模拟考虑了在空隙空间中的气体流动和物质传输，固体中的电子传导以及两相中的热传递。结果表明，气体扩散通道和固体基质在GDL上的曲折度显着不同，前者约为1.2，后者约为13.8。这种差异源于GDL的合成微观结构，即细碳纤维的横向排列特性，从而使固相传输大部分发生在横向方向上。还提出了关于曲折的广泛讨论。该数值工具可用于研究GDL微观结构对孔隙水平传输的影响，并详细研究当前燃料电池建模中广泛采用的宏观方法。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第6期|1128-1138|共11页
  • 作者

    Yun Wang; Sungchan Cho; Ralf Thiedmann; Volker Schmidt; Werner Lehnert; Xuhui Feng;

  • 作者单位

    Renewable Energy Resources Lab (RERL) and National Fuel Cell Research Center, Department of Mechanical and Aerospace Engineering, The University of California, Irvine, CA 92697-3975, USA;

    Renewable Energy Resources Lab (RERL) and National Fuel Cell Research Center, Department of Mechanical and Aerospace Engineering, The University of California, Irvine, CA 92697-3975, USA;

    Institute of Stochastics, Ulm University. 89069 Ulm, Germany;

    Institute of Stochastics, Ulm University. 89069 Ulm, Germany;

    Forschungszentrum Jiilich GmbH, 52425 Julich, Germany;

    Renewable Energy Resources Lab (RERL) and National Fuel Cell Research Center, Department of Mechanical and Aerospace Engineering, The University of California, Irvine, CA 92697-3975, USA;

  • 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

    polymer electrolyte fuel cell; gas diffusion layer; direct simulation; stochastic modeling;

    机译：聚合物电解质燃料电池气体扩散层;直接模拟;随机建模;

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