A detailed two-dimensional transient model has been formulated and numerically solved for concurrent flames over thick and thin solids in low-speed forced flows. The processes of flame growth leading to steady states are numerically simulated. For a thick solid, the steady state is a nongrowing stationary flame with a limiting length. For a thin solid, the steady state is a spreading flame with a constant spread rate and a constant flame length. The reason for a nongrowing limiting flame for the thick solid is the balance between the flame heat feedback and the surface radiative heat loss at the pyrolysis front, as first suggested by Honda and Ronney. The reason for achieving a steady spread for thin solids is the balance between the solid burnout rate and the flame tip advancing rate. Detailed transient flame and thermal profiles are presented to illustrate the different flame growth features between the thick- and thin-solid fuel samples.
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September 2010
This article was originally published in
Journal of Heat Transfer
Research Papers
Limiting Length, Steady Spread, and Nongrowing Flames in Concurrent Flow Over Solids
Ya-Ting Tseng,
Ya-Ting Tseng
Department of Mechanical and Aerospace Engineering,
e-mail: yating@case.edu
Case Western Reserve University
, 10900 Euclid Avenue, 418 Glennan Building, Cleveland, OH 44106
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James S. T’ien
James S. T’ien
Department of Mechanical and Aerospace Engineering,
e-mail: jst2@case.edu
Case Western Reserve University
, 10900 Euclid Avenue, 418 Glennan Building, Cleveland, OH 44106
Search for other works by this author on:
Ya-Ting Tseng
Department of Mechanical and Aerospace Engineering,
Case Western Reserve University
, 10900 Euclid Avenue, 418 Glennan Building, Cleveland, OH 44106e-mail: yating@case.edu
James S. T’ien
Department of Mechanical and Aerospace Engineering,
Case Western Reserve University
, 10900 Euclid Avenue, 418 Glennan Building, Cleveland, OH 44106e-mail: jst2@case.edu
J. Heat Transfer. Sep 2010, 132(9): 091201 (9 pages)
Published Online: June 28, 2010
Article history
Received:
October 7, 2009
Revised:
April 19, 2010
Online:
June 28, 2010
Published:
June 28, 2010
Citation
Tseng, Y., and T’ien, J. S. (June 28, 2010). "Limiting Length, Steady Spread, and Nongrowing Flames in Concurrent Flow Over Solids." ASME. J. Heat Transfer. September 2010; 132(9): 091201. https://doi.org/10.1115/1.4001645
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