The effect of Prandtl number of a medium on heat transfer across a horizontal layer was measured. Stainless steel particles of diameters 1.6, 3.2, and 4.8 mm, glass particles of diameters 2.5 and 6.00 mm, and lead particles of diameter 0.95 mm were used with silicon oil, water, and mercury as working fluids. The bed height was varied from 2.5 to 12 cm. Experimental results are presented showing Nusselt number as a function of medium Rayleigh number with the effective Prandtl number, defined as the product of medium Prandtl number and Kozeny–Carmen constant, serving as a parameter. Correlations for Nusselt number are given for effective Prandtl number less than 0.1 and for effective Prandtl number greater than 0.1, which corresponds to an infinite effective Prandtl number. For the steel–water case the wavenumber is shown as a function of medium Rayleigh number.
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Prandtl Number Dependence of Natural Convection in Porous Media
T. Jonsson,
T. Jonsson
Mechanical, Aerospace, and Nuclear Engineering Department, School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, CA 90024
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I. Catton
I. Catton
Mechanical, Aerospace, and Nuclear Engineering Department, School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, CA 90024
Search for other works by this author on:
T. Jonsson
Mechanical, Aerospace, and Nuclear Engineering Department, School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, CA 90024
I. Catton
Mechanical, Aerospace, and Nuclear Engineering Department, School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, CA 90024
J. Heat Transfer. May 1987, 109(2): 371-377 (7 pages)
Published Online: May 1, 1987
Article history
Received:
July 29, 1985
Online:
October 20, 2009
Citation
Jonsson, T., and Catton, I. (May 1, 1987). "Prandtl Number Dependence of Natural Convection in Porous Media." ASME. J. Heat Transfer. May 1987; 109(2): 371–377. https://doi.org/10.1115/1.3248090
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