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Experimental Investigation of Natural Convection Heat Transfer From a Horizontal Array of Three Heated Cylinders

[+] Author Affiliations
Asim Chatha, Ahmad Fakheri

Bradley University

Paper No. IMECE2005-82616, pp. 69-74; 6 pages
doi:10.1115/IMECE2005-82616
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Process Industries
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Process Industries Division
  • ISBN: 0-7918-4227-4 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

An experimental study was performed to determine the natural convection heat transfer characteristics of a row of three horizontal heated cylinders of two different diameters (0.625 in. and 1.50 in.) with various cylinder-spacing arrangements. As a result, it was found that the heat transfer characteristics are strongly dependent on the spacing between the cylinders and the Rayleigh number Ra. The results of this study show that as the inter-cylinder spacing between a single row of three horizontal heated cylinders is reduced, the natural convection heat transfer coefficient and the heat transfer from each cylinder initially increase and then decrease beyond those for infinitely apart cylinders. Therefore, the array’s total rate of heat transfer increases because of two factors: the enhanced heat transfer coefficient, and the ability to add more cylinders in a fixed volume. This type of behavior has not been reported before experimentally and should be useful in the design of heat exchangers to reduce their sizes.

Copyright © 2005 by ASME

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