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RESEARCH PAPERS: Natural and Mixed Convection

The Effects of Property Variations on Natural Convection in a Square Enclosure

[+] Author and Article Information
A. F. Emery

Department of Mechanical Engineering, University of Washington, Box 352600, Seattle, WA 98195-2600

J. W. Lee

Institute for Advanced Engineering, Yongin P. 0. Box 25, Yongin, Kyonggi-do, Korea

J. Heat Transfer 121(1), 57-62 (Feb 01, 1999) (6 pages) doi:10.1115/1.2825966 History: Received August 01, 1997; Revised October 08, 1998; Online December 05, 2007

Abstract

Natural convection in a square enclosure with heated vertical walls and temperature-dependent conductivity and viscosity was simulated for Prandtl numbers ranging from 0.01 to 1.0 and Ra ≤ 106 . Although the variable properties produced observable changes in the the temperatures and velocities, the overall heat transfer, as represented by the Nusselt number, was found to be unaffected and was accurately correlated in terms of the Rayleigh and Prandtl numbers using Nu = 0.185 Ra00.278 Pr00.089 with properties evaluated at the average temperature. This correlation applies to both isothermal and constant heat flux hot walls.

Copyright © 1999 by The American Society of Mechanical Engineers
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