Study of conjugate natural convection between vertical coaxial rectangular cylinders

Gavara, Madhusudhana and Kanna, Rajesh P (2012) Study of conjugate natural convection between vertical coaxial rectangular cylinders. In: INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 39 (7). pp. 904-912.

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Abstract

Laminar natural convection between two coaxial vertical rectangular cylinders is numerically studied in this work. The outer cylinder is connected with vertical rectangular inlet and outlet pipes. The inner cylinder dissipates volumetric heat. The fluid flow and heat transfer characteristics between the cylinders are analyzed in detail for various Grashof numbers. The heat transfer rates on the individual faces of the inner cylinder are reported. The bottom face of the inner cylinder is found to associate with much higher heat rates than those of the other faces. The average Nusselt number on bottom face is more than 2.5 times of the Nusselt number averaged on all the faces. At a given elevation, local Nusselt number on the inner cylinder faces increases towards cylinder edges. The effect of thermal condition of the walls of outer cylinder, inlet and outlet on the natural convection is analyzed. The thermal condition shows strong qualitative and quantitative impact on the fluid flow and heat transfer. The variation of induced flow rate, dimensionless maximum temperature and average Nusselt numbers with Grashof number is studied. Correlations for dimensionless buoyancy-induced mass flow rate and temperature maximum are presented. (c) 2012 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Laminar natural convection;Concentric rectangular vertical cylinders;Three-dimensional numerical study
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	15 Oct 2012 04:46
Last Modified:	15 Oct 2012 04:47
URI:	http://eprints.iisc.ac.in/id/eprint/45094

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