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RESEARCH PAPERS

An Experimental Study of Free Convection Heat Transfer From an Array of Horizontal Cylinders Parallel to a Vertical Wall

[+] Author and Article Information
T. R. Al-Alusi

General Dynamics, Sterling Heights, MI

D. J. Bushnell

Department of Mechanical Engineering, Oregon State University, Corvallis, OR 97331

J. Heat Transfer 114(2), 394-400 (May 01, 1992) (7 pages) doi:10.1115/1.2911287 History: Received July 16, 1990; Revised October 14, 1991; Online May 23, 2008

Abstract

An experimental investigation of heat transfer from an array of three horizontal cylinders aligned vertically parallel to a single wall is presented. Three different cylinder center-to-center spacings for the array cylinders were examined, CC= 1.5D, 2D, and 4D. The wall-array spacings were varied from 0.081D to infinity. The cylinders were placed in a still air medium at atmospheric pressure and maintained at constant heat flux. Modified Rayleigh number, based on the diameter of the cylinders, ranged from 6.2 × 104 to 1.2 × 106 . Results indicate that heat transfer is generally enhanced, but for some wall spacing to cylinder configurations the heat transfer can be minimally decreased. For cases where the heat transfer was enhanced the top cylinder in the array was observed to have the highest enhancement (22 percent) and the lowest cylinder was enhanced the least (5 percent). Flow visualization studies showed that the wall generated a chimney effect between the wall and the cylinders.

Copyright © 1992 by The American Society of Mechanical Engineers
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