RESEARCH PAPERS: Natural and Mixed Convection

Heat Transfer Enhancement From a Vertical, Isothermal Channel Generated by the Chimney Effect

[+] Author and Article Information
A. G. Straatman, J. D. Tarasuk, J. M. Floryan

The University of Western Ontario, London, Ontario, Canada

J. Heat Transfer 115(2), 395-402 (May 01, 1993) (8 pages) doi:10.1115/1.2910691 History: Received May 01, 1992; Revised October 01, 1992; Online May 23, 2008


A numerical and experimental investigation of free convection from vertical, isothermal, parallel-walled channels has been undertaken to explore the heat transfer enhancement obtained by adding adiabatic extensions of various sizes and shapes. Investigations were carried out for air (Pr= 0.7) over a wide range of wall heating conditions. In all cases, the adiabatic extensions were able to increase heat transfer. The increase varied from 2.5 at low Ra* to 1.5 at high Ra*. The experimental and numerical results are in excellent agreement. A single correlation accounting for the channel aspect ratio Lh /b , expansion ratio, B/b , modified Rayleigh number, Ra* and heated length ratio, Lh /L is presented.

Copyright © 1993 by The American Society of Mechanical Engineers
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