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RESEARCH PAPERS

Experimental, Variable Properties Natural Convection From a Large, Vertical, Flat Surface

[+] Author and Article Information
D. L. Siebers

Sandia National Laboratories, Livermore, Calif.

R. F. Moffatt

Dept. of Mech. Engineering, Stanford University, Stanford, Calif.

R. G. Schwind

Nielsen Engineering and Research Inc., Mountain View, Calif.

J. Heat Transfer 107(1), 124-132 (Feb 01, 1985) (9 pages) doi:10.1115/1.3247367 History: Received May 23, 1983; Online October 20, 2009

Abstract

Natural convection heat transfer from a vertical, 3.02 m high by 2.95 m long, electrically heat surface in air was studied. The air was at the ambient temperature and the atmospheric pressure, and the surface temperature was varied from 60 C to 520 C. These conditions resulted in Grashof numbers up to 2 × 1012 and surface-to-ambient temperature ratios up to 2.7. Convective heat transfer coefficients were measured at 105 locations on the surface by an energy balance. Boundary layer mean temperature profiles were measured with a thermocouple. Results show that: (1) the turbulent natural convection heat transfer data are correlated by the expression

Nuy=0.098Gry1/3TwT−0.14
when all properties are evaluated at T∞ ; (2) variable properties do not have a significant effect on laminar natural convection heat transfer; (3) the transition Grashof number decreases with increasing temperature; and (4) the boundary layer mean temperaturue profiles for turbulent natural convection can be represented by a “universal” temperature profile.

Copyright © 1985 by ASME
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