Effect of Destabilizing Heating on Görtler Vortices

[+] Author and Article Information
Y. Kamotani, J. K. Lin, S. Ostrach

Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106

J. Heat Transfer 107(4), 877-882 (Nov 01, 1985) (6 pages) doi:10.1115/1.3247516 History: Received June 05, 1984; Online October 20, 2009


Experimental investigations of the effect of destabilizing heating on the vortex instability in a laminar boundary-layer flow of air along a concave surface are reported. The ranges of the parameters studied herein are Gr (Grashof number) from 0 to 70 and G (Görtler number) from 0.46 to 9.0. The wavelength of the vortices remains unchanged with heating but the strength of the vortices is enhanced by heating. The amplitude of the vortices increases almost exponentially with the combined parameter (G2 + f Gr)1/2 , where f is found to be between 0.3 and 0.4, until the nonlinear effects become important. In the nonlinear region the original sinusoidal wave form of the vortices becomes distorted and they meander in the lateral direction.

Copyright © 1985 by ASME
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