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RESEARCH PAPERS: Natural and Mixed Convection

Optimal Geometric Arrangement of Staggered Vertical Plates in Natural Convection

[+] Author and Article Information
G. A. Ledezma, A. Bejan

Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708-0300

J. Heat Transfer 119(4), 700-708 (Nov 01, 1997) (9 pages) doi:10.1115/1.2824174 History: Received January 21, 1997; Revised June 13, 1997; Online December 05, 2007

Abstract

This paper documents the geometric optimization of an assembly of staggered vertical plates that are installed in a fixed volume. The heat transfer is by laminar natural convection. The objective is to maximize the overall thermal conductance between the assembly of plates and the surrounding fluid. The geometric parameters that vary are the horizontal spacing between adjacent columns of plates, the number of plates mounted in each vertical column, the plate dimensions, and the stagger between columns. The optimization is performed numerically and experimentally in the range Pr = 0.72 and 103 ≤ RaL ≤ 106 , where RaL is the Rayleigh number based on the vertical dimension of the assembly (L ). The results for the optimal horizontal spacing are correlated using formulas derived from the theory of the intersection of asymptotes (Bejan, 1984, 1995).

Copyright © 1997 by The American Society of Mechanical Engineers
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