Title

Decoupling Pressure and Distribution Effects of Flow Fields on Polymer Electrolyte Fuel Cell System Performance

Abstract

The performance of Polymer Electrolyte Membrane Fuel Cells (PEMFCs) is highly dependent on the flow distribution and pressure of reactant gases, which are controlled by flow field design. The relative importance of differing supply pressure requirements of flow field designs in PEMFCs is considered here. A First-Law analysis of the auxiliary system is developed in order to demonstrate how the pressure drop affects all auxiliary system components and fuel cell unit performance. A method of comparison is then proposed to eliminate the effects of pressure in the comparison of fuel cells with different flow field designs. This method is applied to the single serpentine and parallel designs by Computational Fluid Dynamics (CFD) simulation. It is shown that, of the serpentine design's 17.1% better performance, mass transport effects provide 12.2% improvement, and pressure effects account for the remaining 4.9%. Finally, a metric is proposed by which the relative effect of pressure between different flow field designs may be estimated for past results not using the recommended method, and is demonstrated by application to results found in existing literature.

Department(s)

Mechanical and Aerospace Engineering

Comments

This work was supported by the National Science Foundation under the grant No. CMMI - 1131659 , USA, and by the Missouri University of Science and Technology ’s Innovation Initiative, USA.

Keywords and Phrases

Computational fluid dynamics (CFD); First law analysis; Flow distributor design; Fuel cell; Polymer electrolyte membrane (PEM); System performance comparison

International Standard Serial Number (ISSN)

2213-1388

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Elsevier Ltd, All rights reserved.

Publication Date

01 Dec 2019

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