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Planform structure of turbulent free convection on horizontal surfaces

Theerthan, SA and Arakeri, Jaywant H (1997) Planform structure of turbulent free convection on horizontal surfaces. In: Turbulence, heat and mass transfer 2; Proceedings of the 2nd International Symposium, 9-12 June 1997, Delft, Netherlands.

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The planform structure of turbulent free convection over a heated horizontal surface has been visualized and analyzed for different boundary conditions at the top and for different aspect ratios, for flux Rayleigh numbers ranging from 10 exp 8 - 10 exp 10. The different boundary conditions correspond to Rayleigh-Benard convection, open convection with evaporation at the top and with an imposed external flow on the heated boundary. Without the external flow the planform is one randomly oriented line plume. At large Ra, these line plumes seem to align along the diagonal, persumably due to a large-scale flow along as visualized in the side view. When the external flow is imposed, the line plumes clearly align in the direction of external flow. Flow visualization reveals that at these Ra, the shear tends to break the plumes which otherwise would reach the opposite boundary. (Author)

Item Type: Conference Paper
Publisher: Delft Univ Press
Additional Information: Copyright of this article belongs to Delft Univ Press.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 15 Mar 2012 10:27
Last Modified: 15 Mar 2012 10:27
URI: http://eprints.iisc.ac.in/id/eprint/43942

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