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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Numerical Study on Entropy Generation for Mixed Convection in Square Enclosures for IsoThermally and Non-IsoThermally Hot Bottom Wall

Get access (open in a dialog) DOI: 10.1615/IHTC15.mcv.009524
pages 4635-4648

Abstract

The concept of ‘entropy generation minimization’, which is a thermodynamic approach for optimization, is useful in designing efficient thermal systems. Present study deals with entropy generation in steady mixed convection flow within a square cavity for case 1: isothermally heated bottom wall and case 2: non-isothermally heated bottom wall. In both cases, side walls are isothermally cooled and top wall is well insulated. Influence of uniform and non-uniform heating on entropy generation is studied for air (Prandtl number, Pr = 0.7) at Reynolds number, Re = 1 and 100 in the range of Grashof number, Gr = 103 ? 105. Galerkin finite method is employed to solve the governing equations and results are presented via contours of streamlines, local entropy generation due to fluid friction, isotherms, entropy generation due to heat transfer, total entropy generation and Bejan number maps. Also, overall heat transfer rate at bottom wall and total entropy generation at various Gr are studied. It is found that, Re = 100 may lead to optimal entropy generation with higher heat transfer rate for both cases.