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On the influence of the plate thickness on the boundary layer ignition for large activation energies

✍ Scribed by C. Treviño; A.C. Fernandez-Pello

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
549 KB
Volume
49
Category
Article
ISSN
0010-2180

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✦ Synopsis

An analysis is performed of the influence of the plate thermal resistance on the boundary layer thermal ignition of a premixed combustible gas for the case of large activation energy. The analysis makes use of the boundary layer approximation to describe the gas flow and of Fast-order matched asymptotic expansions to define ignition. Explicit expressions are derived for the critical DamkiShler number forignition and for the ignition distance. It is shown that these variables depend on a nondimensional parameter that includes the plate and gas thermal resistances (Blot number) and the local DamkiJhler number. The magnitude of the ignition variables increases with this parameter. Comparison of the results for high and low activation energies shows that their magnitude affects not only the location of ignition but the relative position of the adiabatic and ignition points.

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