Free Convection Heat Transfer From Spheroids

[+] Author and Article Information
G. D. Raithby, K. T. G. Hollands, M. M. Yovanovich

Thermal Engineering Group, Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada

A. Pollard

Department of Mechanical Engineering, Imperial College of Science and Technology, London, England

J. Heat Transfer 98(3), 452-458 (Aug 01, 1976) (7 pages) doi:10.1115/1.3450575 History: Received March 03, 1976; Online August 11, 2010


Measurements of the heat transfer by free convection from isothermal spheroids to air are reported. The range of Rayleigh number, Ra, covered was sufficiently large that both thick boundary layer effects (at low Ra) and turbulence (at high Ra) affect the heat transfer. Data are reported for one prolate spheroid and two oblate spheroids. The results of an approximate method of analysis, which accounts for both thick boundary layers and turbulence, are also given. These are compared to the present measurements, and to earlier measurements for spheres. Excellent agreement with experiment is found. Correlation equations, from which average heat transfer rates can be calculated, are also given. These are thought to be valid at all Rayleigh numbers over a large range of eccentricity.

Copyright © 1976 by ASME
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