Natural Convection Heat Transfer in Beds of Inductively Heated Particles

[+] Author and Article Information
S. J. Rhee, V. K. Dhir, I. Catton

Chemical, Nuclear, and Thermal Engineering Department, School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, Calif.

J. Heat Transfer 100(1), 78-85 (Feb 01, 1978) (8 pages) doi:10.1115/1.3450507 History: Received August 19, 1977; Online August 11, 2010


Experimental observations of the onset of convective motion in beds of inductively heated particles have been made. Data for the heat transfer coefficient were obtained from water-cooled beds of steel particles. The particulate beds were formed in a 10.4 cm dia glass jar, insulated at the bottom and on the sides. The free surface of a layer of water overlying the bed was maintained at a constant temperature by a copper plate cooled with tap water. In the experiments, the depths of the particulate bed and the overlying layer were varied. The observations showed that increasing the depth of the liquid layer over the bed tended to lower the critical internal Rayleigh number at which the onset of convection occurred. For overlying liquid layer-to-bed depth ratios of one or more, natural convection was observed to begin at R1 ≃ 11.5. The heat transfer data for RI > 11.5 are correlated with Nu = 0.190 RI 0.69 However, with no liquid layer on top of the bed, natural convection was observed to occur at RI ≃ 46, which is slightly higher than observed in earlier studies made with Joule heating.

Copyright © 1978 by ASME
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