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On the ignition and extinction problems in forced convection systems

Jain, VK and Mukunda, HS (1968) On the ignition and extinction problems in forced convection systems. In: International Journal of Heat and Mass Transfer, 11 (3). pp. 491-508.

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Official URL: http://dx.doi.org/10.1016/0017-9310(68)90092-6


In this paper the problem of ignition and extinction has been formulated for the flow of a compressible fluid with Prandtl and Schmidt numbers taken as unity. In particular, the problems of (i) a jet impinging on a wall of combustible material and (ii) the opposed jet diffusion flame have been studied. In the wall jet case, three approximations in the momentum equation namely, (i) potential flow, (ii) viscous flow, (ii) viscous incompressible with k = 1 and (iii) Lees' approximation (taking pressure gradient terms zero) are studied. It is shown that the predictions of the mass flow rates at extinction are not very sensitive to the approximations made in the momentum equation. The effects of varying the wall temperature in the case (i) and the jet temperature in the case (ii) on the extinction speeds have been studied. The effects of varying the activation energy and the free stream oxidant concentration in case (ii), have also been investigated.

Item Type: Journal Article
Publication: International Journal of Heat and Mass Transfer
Publisher: Elsevier Science Ltd.
Additional Information: Copy right of this article belongs to Elsevier Science Ltd.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 11 May 2010 10:48
Last Modified: 19 Sep 2010 06:06
URI: http://eprints.iisc.ac.in/id/eprint/27740

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