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Plumes Dynamics and Heat Transfer over Horizontal Grooved Surfaces

Subudhi, S and Arakeri, JH (2012) Plumes Dynamics and Heat Transfer over Horizontal Grooved Surfaces. In: Experimental Heat Transfer, 25 (1). pp. 58-76.

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Official URL: http://www.tandfonline.com/doi/abs/10.1080/0891615...

Abstract

This study investigates the free convection and plumes dynamics over horizontal surfaces with parallel V-grooves. The convection is studied in a tank of water with the bottom surface being a smooth or grooved surface and the top of the water surface exposed to ambient. Two groove heights were used-10 mm and 3 mm-and the experiment was done with two values of aspect ratio-2.9 and 1.8 (aspect ratio is the width of the fluid layer/height of fluid layer). Heat flux at the bottom surface was from electrical heating. Beyond a certain critical temperature difference, enhanced heat transfer is obtained on the grooved surface compared to a smooth surface. Nusselt numbers are evaluated for both smooth and grooved surfaces and correlated using modified Rayleigh numbers. Visualization shows that the enhanced heat transport in the rough cavities cannot be ascribed to the increase in the contact area; rather, it must be the local dynamics of the thermal boundary layer.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Keywords: free convection;V-grooves;conduction layer thickness;plumes
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 01 May 2012 10:53
Last Modified: 01 May 2012 10:53
URI: http://eprints.iisc.ernet.in/id/eprint/44361

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