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Entropy 2003, 5(5), 358-365; doi:10.3390/e5050358

Article

Free Convection and Irreversibility Analysis inside a Circular Porous Enclosure

Shohel Mahmud*  and Roydon Andrew Fraser*

Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada

* Authors to whom correspondence should be addressed.

Received: 5 November 2002 / Accepted: 11 May 2003 / Published: 31 December 2003

(This article belongs to the Special Issue Entropy Generation in Thermal Systems and Processes)

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Abstract: We investigate the nature of heat transfer and entropy generation for natural convection in a two-dimensional circular section enclosure. The enclosure is assumed to fill with porous media. The Darcy momentum equation is used to model the porous media. The full governing differential equations are simplified with the Boussinesq approximation and solved by a finite volume method. Whereas the Prandtl number Pr is fixed to 1.0. Results are presented in terms of Nusselt number, entropy generation number, and Bejan number.

Keywords: porous cavity; irreversibility; entropy generation; Bejan number; Nusselt number

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