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Technical Briefs

Laminar Forced Convection for Flow Across a Cylinder With Longitudinal Fins of Finite Thickness

[+] Author and Article Information
S. C. Haldar1

Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, University of the West Indies, St. Augustine, Trinidad, Trinidad and Tobagoschaldar@rediffmail.com

G. S. Kochhar, K. Manohar

Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, University of the West Indies, St. Augustine, Trinidad, Trinidad and Tobago

1

Corresponding author.

J. Heat Transfer 130(9), 094502 (Jul 10, 2008) (4 pages) doi:10.1115/1.2946477 History: Received June 01, 2007; Revised February 15, 2008; Published July 10, 2008

Conjugate numerical solution of laminar forced convection for cross-flow over a cylinder with external longitudinal fins of finite thickness has been carried out. The rate of heat transfer from the fins increases and that from the free area of the cylinder marginally decreases with an increase in thickness, length, and number of fins. The rate of heat transfer from the fins alone is usually much higher than that from the cylinder surface. As a consequence, the net result of these two opposing effects is an increase in the total heat transfer over that of the smooth cylinder, the amount increasing with an increase in thickness, length, and number of fins but with diminishing returns. The fins are more effective at high Re values than at low ones.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the physical problem

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Figure 2

Effect of the fin thickness on the temperature of the fin at 40deg

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Figure 3

Variation of heat transfer from the fins with thickness and number of fins

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Figure 4

Heat transfer from the uncovered part of the cylinder with thickness and number of fins

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Figure 5

Total heat transfer with fin length at different Re

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Figure 6

Total heat transfer with number of fins at different Re

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