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CONV-09. Proceedings of International Symposium on Convective Heat and Mass Transfer in Sustainable Energy
April 26 - May 1, 2009, Hammamet, Tunisia

DOI: 10.1615/ICHMT.2009.CONV


ISBN Print: 978-1-56700-261-4

ISSN Online: 2642-3499

ISSN Flash Drive: 2642-3502

NATURAL CONVECTION IN A FINNED RAYLEIGH-BENARD CUBICAL ENCLOSURE

page 7
DOI: 10.1615/ICHMT.2009.CONV.560
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ABSTRACT

The papers deals with a numerical 3D study of natural convection in a finned Rayleigh-Benard (RB) cubical enclosure. A single fin with a thickness of 10% of the cavity side (and a height of 50%) is placed vertically on the bottom hot wall at TH. The working fluid is air with Prandtl number Pr = 0.71 and the Rayleigh number (Ra) varies from 103 to 105. The solid-to-fluid thermal conductivity ratio (Rk) was fixed at Rk = 7000, corresponding to a metal of high conductivity. The top wall is at the temperature TC <TH and the remaining four surfaces are insulated. Inside the RB enclosure, the flow structure and the temperature distribution are presented in terms of mean velocity vector plots and isotherm plots. The effects of the Rayleigh number on the mean heat transfer rate through the cold wall are presented and discussed. A correlation between the averaged Nusselt number through the top wall and Ra is proposed.

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