Natural Convection Correlations for Vertical Surfaces Including Influences of Variable Properties

[+] Author and Article Information
A. M. Clausing

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, Ill. 61801

J. Heat Transfer 105(1), 138-143 (Feb 01, 1983) (6 pages) doi:10.1115/1.3245532 History: Received April 26, 1982; Online October 20, 2009


New correlations are presented for natural convective heat transfer from vertical isothermal surfaces in gases. The influences of variable properties are accounted for by using empirical equations which are of the general form Nu = g(Ra) • f(Ra, Tw /T∞ ). The influence of the reference temperature at which the thermal properties are evaluated is also established. Comparisons with available data are made over a Rayleigh number range 104 < Ra < 1012 and a range in the surface-to-ambient temperature ratio of 1 < Tw /T∞ < 2.6. Five data sets, which represent over 200 test points, are examined.

Copyright © 1983 by ASME
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