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Experimental investigations on liquid water removal from the gas diffusion layer by reactant flow in a PEM fuel cell

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  • Jiao, Kui
  • Park, Jaewan
  • Li, Xianguo

Abstract

The cross flow from channel to channel through gas diffusion layer (GDL) under the land could play an important role for water removal in proton exchange membrane (PEM) fuel cells. In this study, characteristics of liquid water removal from GDL have been investigated experimentally, through measuring unsteady pressure drop in a cell which has the GDL initially wet with liquid water. The thickness of GDL is carefully controlled by inserting various thicknesses of metal shims between the plates. It has been found that severe compression of GDL could result in excessive pressure drop from channel inlet to channel outlet. Removing liquid water from GDL by cross flow is difficult for GDL with high compression levels and for low inlet air flow rates. However, effective water removal can still be achieved at high compression levels of GDL if the inlet air flow rate is high. Based on different compressed GDL thicknesses, different GDL porosities and permeabilities were calculated and their effects on the characteristics of liquid water removal from GDL were evaluated. Visualization of liquid water transport has been conducted by using transparent flow channel, and liquid water removal from GDL under the land was observed for all the tested inlet air flow rates, which confirms that cross flow is practically effective to remove the liquid water accumulated in GDL under the land area.

Suggested Citation

  • Jiao, Kui & Park, Jaewan & Li, Xianguo, 2010. "Experimental investigations on liquid water removal from the gas diffusion layer by reactant flow in a PEM fuel cell," Applied Energy, Elsevier, vol. 87(9), pages 2770-2777, September.
    • Handle: RePEc:eee:appene:v:87:y:2010:i:9:p:2770-2777
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    References listed on IDEAS

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    1. Perng, Shiang-Wuu & Wu, Horng-Wen & Jue, Tswen-Chyuan & Cheng, Kuo-Chih, 2009. "Numerical predictions of a PEM fuel cell performance enhancement by a rectangular cylinder installed transversely in the flow channel," Applied Energy, Elsevier, vol. 86(9), pages 1541-1554, September.
    2. Baschuk, J.J. & Li, Xianguo, 2009. "A comprehensive, consistent and systematic mathematical model of PEM fuel cells," Applied Energy, Elsevier, vol. 86(2), pages 181-193, February.
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