NDLI: Investigation of Porous Gas Diffusions Layer Modeling in PEM Fuel Cells

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Shi, Zhongying Wang, Xia
Copyright Year	2008
Abstract	Darcy’s law, the Brinkman Equation and the modified N-S equation describe the momentum transport phenomena occurring in porous gas diffusion layer. This paper proposes to compare the differences in applying aforementioned models to describe the transport phenomena in porous gas diffusion layers, and evaluate their effects on the fuel cell performance. A two dimensional isothermal single phase PEM fuel cell model is developed, in which Darcy’s law, the Brinkman equation and the modified N-S equation are applied separately in porous electrodes. These three models show no visible effects on the fuel cell performance characterized by the polarization curves. The polarization curve shows a sharp potential drop when calculated by the pure diffusion model. Three values of GDL permeability are investigated here. The order of the magnitude of each term in the modified N-S equation is numerically evaluated. The inertial term is found much smaller than other terms, and can be dropped in the Navier-Stokes equation. Considering the boundary condition setting problem of Darcy’s law and the convergence problem of the modified N-S equation, the Brinkman equation is recommended by this paper to describe the momentum transport in porous electrodes.
Starting Page	427
Ending Page	435
Page Count	9
File Format	PDF
ISBN	9780791848692
DOI	10.1115/IMECE2008-68904
e-ISBN	9780791838402
Volume Number	Volume 8: Energy Systems: Analysis, Thermodynamics and Sustainability; Sustainable Products and Processes
Conference Proceedings	ASME 2008 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2008-10-31
Publisher Place	Boston, Massachusetts, USA
Access Restriction	Subscribed
Subject Keyword	Transport phenomena Navier-stokes equations Momentum Permeability Modeling Polarization (waves) Diffusion (physics) Polarization (electricity) Electrodes Polarization (light) Fuel cells Gas diffusion layers Boundary-value problems Proton exchange membrane fuel cells Darcy's law
Content Type	Text
Resource Type	Article

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