Effect of favorable pressure gradient on transitional spot formation rate

Deya, J and Narasimha, R (1991) Effect of favorable pressure gradient on transitional spot formation rate. In: Experimental Thermal and Fluid Science, 4 (2). pp. 192-197.

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Abstract

The calculation of the transitional boundary layer requires estimates of the extent of the transition zone, which in turn depends on the rate at which turbulent spots are formed. This rate has been found to scale with local boundary layer thickness and viscosity, and the resulting nondimensional group (called crumble) is a function of the pressure gradient, among other parameters. Available experimental data are analyzed to show that the crumble increases slowly with increasing favorable pressure gradients, being about four times as large as in constant-pressure flow when the Thwaites pressure gradient parameter at the effective origin of the resulting turbulent boundary layer is 0.1 and when transition is driven by free-stream turbulence.

Item Type:	Journal Article
Publication:	Experimental Thermal and Fluid Science
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Keywords:	boundary layer;transition zone;spot formation rate;pressure gradient;intermittency.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	01 Dec 2010 04:18
Last Modified:	01 Dec 2010 04:18
URI:	http://eprints.iisc.ac.in/id/eprint/33752

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