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Title: Plumes dynamics and heat transfer over horizontal grooved surfaces
Authors: Subudhi, Sudhakar
Arakeri J.H.
Published in: Experimental Heat Transfer
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. © 2012 Copyright Taylor and Francis Group, LLC.
Citation: Experimental Heat Transfer (2012), 25(1): 58-76
Issue Date: 2012
Keywords: conduction layer thickness
free convection
ISSN: 8916152
Author Scopus IDs: 54407504100
Author Affiliations: Subudhi, S., Department of Mechanical Engineering, NIT Calicut, Keral, Calicut-673601, India
Arakeri, J.H., Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
Corresponding Author: Subudhi, S.; Department of Mechanical Engineering, NIT Calicut, Keral, Calicut-673601, India; email:
Appears in Collections:Journal Publications [ME]

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