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RESEARCH PAPERS

Heat Transfer by Natural Convection of Mercury in Enclosed Spaces When Heated From Below and Rotated

[+] Author and Article Information
David Dropkin

Department of Thermal Engineering, Cornell University, Ithaca, N. Y.

George Gelb

Department of Thermal Engineering, Cornell University

J. Heat Transfer 86(2), 203-206 (May 01, 1964) (4 pages) doi:10.1115/1.3687095 History: Received April 23, 1963

Abstract

This paper presents results of an experimental investigation of convective heat transfer in mercury confined by two horizontal plates, heated from below, and spun about its vertical axis. The experiments covered a range of Rayleigh numbers between 1.1(10)6 and 5.17(10)7 , and Taylor numbers from 0 to 7.75(10)10 . The Prandtl number was practically constant. The results indicate that for low spin rates, up to a certain critical value of Taylor number, the change in the heat-transfer coefficient is insignificant and the equation derived for the stationary case can be used. The critical Taylor number is given by

Ta(critical) = 0.68(Ra)1.28
Above the critical Taylor number, the heat-transfer coefficient may be computed from the relationship
Nu = 0.095(Ra)0.852(Ta)−0.463
In this equation the characteristic dimension of length, for Nu, Ra, and Taylor numbers, is the distance between plates.

Copyright © 1964 by ASME
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