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Binary Diffusion Coefficients at Varying Temperatures and Partial Pressures in a Fuel Cell

[+] Author Affiliations
Jurij Avsec, Maks Oblak

University of Maribor

Greg F. Naterer

University of Ontario Institute of Technology

Paper No. IMECE2006-13194, pp. 269-276; 8 pages
doi:10.1115/IMECE2006-13194
From:
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 1
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4784-5 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME

abstract

This article develops new predictive models of diffusion coefficients and ordinary diffusion coefficients for solid oxide fuel cells and proton exchange membrane fuel cells. In particular, diffusion coefficients are predicted with methods of nonequilibrium statistical thermodynamics, up to the third order. This article outlines a new analytical method for predicting changes of these coefficients at varying pressures and temperatures. The effective Knudsen diffusion coefficient is derived from kinetic theory, by means of associating the gas molecule mean free path with the pore diameter and a ratio of the solid porosity to the tortuosity.

Copyright © 2006 by ASME

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