RESEARCH PAPERS: Natural Convection

Turbulent Natural Convection From a Vertical Cylinder to an Array of Cooled Tubes

[+] Author and Article Information
D. M. McEligot, C. M. Stoots, W. A. Christenson, D. C. Mecham, W. G. Lussie

Idaho National Engineering Laboratory/EG&G Idaho, Idaho Falls, ID 83415-3895

J. Heat Transfer 115(4), 928-937 (Nov 01, 1993) (10 pages) doi:10.1115/1.2911389 History: Received September 09, 1992; Revised March 23, 1993; Online May 23, 2008


In order to determine whether available correlations are adequate to treat a complicated, turbulent natural convection problem encountered in industrial practice, experiments were conducted by resistively heating a slender, vertical cylinder centered inside a concentric perforated tube, which was, in turn, surrounded by an array of three larger-diameter cooled tubes. The ratio of the test section temperature to the cooling tube temperature was varied up to 2.6; and the Rayleigh number, based on tube diameter and properties evaluated at the cooling tube temperature, ranged from 2.9×104 to 9.2×105 . Results indicate that the convective heat transfer parameters for the perforated tube are about 15 percent higher than for the smooth bare tube centered in the same position relative to the array. The Nusselt number for convective heat transfer across the annulus between the heated test section and the perforated tube corresponded approximately to parallel laminar flow (i.e., Nus ≈1).

Copyright © 1993 by The American Society of Mechanical Engineers
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