A mathematical multilayer, multispecies two-phase model for polymer electrolyte fuel cells (PEFCs) is presented based on fundamental molecular theory using the general transport equation (GTE). The GTE was previously developed and applied to bridge the gap that exists between the benchmark modeling philosophies in the literature for transport across the PEFC. In the current work, the GTE is applied with Darcy’s law to describe water transport and water uptake through the porous and quasiporous layers of a PEFC under single- and two-phase operating conditions. The characteristic transport equations and available material properties from the literature are translated into a single-cell fuel cell model, which is implemented using the object modeling technique. The PEFC model is applied to predict and validate the net water transport ratio and water content under a range of operating conditions. The numerical model exhibits good agreement with experimental data under both vapor- and liquid-equilibrated conditions. The model is then applied in a water transport study to determine the effects of cell compression on local water content, liquid water intrusion, water transport, and Ohmic resistance across nonreinforced polymer electrolyte membranes (PEMs) under two-phase operating conditions. The modeling results suggest that the presence of liquid water at the cathodic boundary of the PEM and a well-established liquid water network can affect water uptake and water transport and can reduce the Ohmic resistance of the PEM.
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e-mail: p.rama@lboro.ac.uk
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October 2010
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Polymer Electrolyte Fuel Cell Transport Mechanisms: A Universal Approach to Multilayer Two-Phase Modeling Through the General Transport Equation
Pratap Rama,
Pratap Rama
Department of Aeronautical and Automotive Engineering,
e-mail: p.rama@lboro.ac.uk
Loughborough University
, Leicestershire LE11 3TU, UK
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Rui Chen
Rui Chen
Department of Aeronautical and Automotive Engineering,
Loughborough University
, Leicestershire LE11 3TU, UK
Search for other works by this author on:
Pratap Rama
Department of Aeronautical and Automotive Engineering,
Loughborough University
, Leicestershire LE11 3TU, UKe-mail: p.rama@lboro.ac.uk
Rui Chen
Department of Aeronautical and Automotive Engineering,
Loughborough University
, Leicestershire LE11 3TU, UKJ. Fuel Cell Sci. Technol. Oct 2010, 7(5): 051007 (16 pages)
Published Online: July 16, 2010
Article history
Received:
April 20, 2009
Revised:
October 19, 2009
Online:
July 16, 2010
Published:
July 16, 2010
Citation
Rama, P., and Chen, R. (July 16, 2010). "Polymer Electrolyte Fuel Cell Transport Mechanisms: A Universal Approach to Multilayer Two-Phase Modeling Through the General Transport Equation." ASME. J. Fuel Cell Sci. Technol. October 2010; 7(5): 051007. https://doi.org/10.1115/1.4001004
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