RESEARCH PAPERS: Natural Convection

Laminar Natural Convection in a Discretely Heated Cavity: II—Comparisons of Experimental and Theoretical Results

[+] Author and Article Information
T. J. Heindel, F. P. Incropera, S. Ramadhyani

Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288

J. Heat Transfer 117(4), 910-917 (Nov 01, 1995) (8 pages) doi:10.1115/1.2836310 History: Received December 01, 1994; Revised July 01, 1995; Online January 23, 2008


Three-dimensional numerical predictions and experimental data have been obtained for natural convection from a 3 × 3 array of discrete heat sources flush-mounted on one vertical wall of a rectangular cavity and cooled by the opposing wall. Predictions performed in a companion paper (Heindel et al., 1995a) revealed that three-dimensional edge effects are significant and that, with increasing Rayleigh number, flow and heat transfer become more uniform across each heater face. The three-dimensional predictions are in excellent agreement with the data of this study, whereas a two-dimensional model of the experimental geometry underpredicts average heat transfer by as much as 20 percent. Experimental row-averaged Nusselt numbers are well correlated with a Rayleigh number exponent of 0.25 for RaLz ≲ 1.2 × 108 .

Copyright © 1995 by The American Society of Mechanical Engineers
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