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Journal of Combustion
Volume 2011, Article ID 250391, 9 pages
http://dx.doi.org/10.1155/2011/250391
Research Article

A Comparison of Flame Spread Characteristics over Solids in Concurrent Flow Using Two Different Pyrolysis Models

Department of Mechanical and Aerospace Engineering, Case Western Reserve University, 10900 Euclid Avenue, 418 Glennan Building, Cleveland, OH 44106, USA

Received 30 October 2010; Accepted 24 February 2011

Academic Editor: Kalyan Annamalai

Copyright © 2011 Ya-Ting Tseng and James S. T'ien. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited..

Abstract

Two solid pyrolysis models are employed in a concurrent-flow flame spread model to compare the flame structure and spreading characteristics. The first is a zeroth-order surface pyrolysis, and the second is a first-order in-depth pyrolysis. Comparisons are made for samples when the spread rate reaches a steady value and the flame reaches a constant length. The computed results show (1) the mass burning rate distributions at the solid surface are qualitatively different near the flame (pyrolysis base region), (2) the first-order pyrolysis model shows that the propagating flame leaves unburnt solid fuel, and (3) the flame length and spread rate dependence on sample thickness are different for the two cases.