Dispersion—An Entropy Generator of Diffusion

[+] Author and Article Information
F. W. Call

Department of Mechanical and Industrial Engineering, Marquette University, P.O. Box 1881, Milwaukee, WI 53201-1881

J. Energy Resour. Technol 120(2), 149-153 (Jun 01, 1998) (5 pages) doi:10.1115/1.2795026 History: Received March 13, 1997; Revised December 18, 1997; Online November 06, 2007


In multicomponent gaseous flows with chemical reactions, diffusion is usually considered to be a single-source entropy generator. Introducing the concept of dispersion, where the atom balance is dominant rather than the molecular, shows in an ideal setting that, even when there is diffusion, the dispersion part of entropy generation can be reduced to zero by proper choice of species flow velocities. Fuel cells and methane reformers are employed as examples to illustrate these concepts.

Copyright © 1998 by The American Society of Mechanical Engineers
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