Uneven gas diffusion layer intrusion in gas channel arrays of proton exchange membrane fuel cell and its effects on flow distribution

被引:88
|
作者
Kandlikar, S. G. [1 ]
Lu, Z. [1 ]
Lin, T. Y. [1 ]
Cooke, D. [1 ]
Daino, M. [1 ]
机构
[1] Rochester Inst Technol, Thermal Anal Microfluid & Fuel Cell Lab, Rochester, NY 14623 USA
关键词
PEMFC; Gas channels; Gas diffusion layer; Intrusion; Flow maldistribution; GDL heterogeneity; WATER MANAGEMENT; INHOMOGENEOUS COMPRESSION; 2-PHASE FLOW; EX-SITU; PART II; PERFORMANCE; MALDISTRIBUTION; TRANSPORT; PRESSURE; PEMFCS;
D O I
10.1016/j.jpowsour.2009.05.019
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Intrusion of the gas diffusion layer (GDL) into gas channels due to fuel cell compression has a major impact on the gas flow distribution, fuel cell performance and durability. In this work, the effect of compression resulting in GDL intrusion in individual parallel PEMFC channels is investigated. The intrusion is determined using two methods: an optical measurement in both the in-plane and through-plane directions of GDL, as well as an analytical fluid flow model based on individual channel flow rate measurements. The intrusion measurements and estimates obtained from these methods agree well with each other. An uneven distribution of GDL intrusion into individual parallel channels is observed. A non-uniform compression force distribution derived from the clamping bolts causes a higher intrusion in the end channels. The heterogeneous GDL structure and physical properties may also contribute to the uneven GDL intrusion. As a result of uneven intrusion distribution, severe flow maldistribution and increased pressure drop have been observed. The intrusion data can be further used to determine the mechanical properties of GDL materials. Using the finite element analysis software program ANSYS, the Young's modulus of the GDL from these measurements is estimated to be 30.9 MPa. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:328 / 337
页数:10
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