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RESEARCH PAPERS

Numerical Investigation of Variable Property Effects on Laminar Natural Convection of Gases Between Two Horizontal Isothermal Concentric Cylinders

[+] Author and Article Information
D. N. Mahony, R. Kumar, E. H. Bishop

Department of Mechanical Engineering, Clemson University, Clemson, SC 29631

J. Heat Transfer 108(4), 783-789 (Nov 01, 1986) (7 pages) doi:10.1115/1.3247013 History: Received February 07, 1985; Online October 20, 2009

Abstract

A numerical finite difference investigation has been conducted to determine the effects of variable properties on the laminar natural convection of gases between horizontal isothermal concentric cylinders. Velocity profiles, temperature profiles, and heat transfer rates have been computed for diameter ratios of 1.5, 2.28, 2.6, and 5.0 and Rayleigh numbers based on gap width up to 1.8 × 105 . The temperature difference ratio θo was varied from 0.2 to 3.0, and the range of validity of the Boussinesq approximation was determined to be θo = 0.2. A volume-weighted mean temperature was shown to be the most effective reference temperature to reduce the heat transfer data for each diameter ratio to a single curve of the form k eq = C RaL n , for 0.2 ≤ θo ≤ 3.0 and RaL = 2.0 × 105 .

Copyright © 1986 by ASME
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