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TECHNICAL BRIEFS

Fin Efficiency of an Annular Fin Composed of a Substrate Metallic Fin and a Coating Layer

[+] Author and Article Information
Ping Tu, Akihiko Horibe, Zhongmin Li, Naoto Haruki

Department of Mechanical Engineering, Faculty of Engineering,  Okayama University, Tsushimanaka 3-1-1, Okayama 700-8530, Japan

Hideo Inaba

Department of Mechanical Engineering, Faculty of Engineering,  Okayama University, Tsushimanaka 3-1-1, Okayama 700-8530, Japaninaba@mech.okayama-u.ac.jp

J. Heat Transfer 128(8), 851-854 (Feb 21, 2006) (4 pages) doi:10.1115/1.2227043 History: Received August 29, 2005; Revised February 21, 2006

An analytical solution to a composite annular fin made of a substrate metallic fin and a coating layer has been carried out. Useful expressions for calculating temperature distribution and fin efficiency have been derived. Comparing the analytical results to those of numerical calculation, the premise for the expressions is also explored. Theoretical analyzing results show that fin efficiency of a coated fin decreases with an increase of the coating layer thickness if the thermal conductivity of coating layer is much less than that of the substrate metallic fin. Whereas, the reverse influence of the coating layer thickness on the fin efficiency appears if the thermal conductivity of the coating layer is beyond the above range.

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Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Schematic view of a composite annular fin

Grahic Jump Location
Figure 2

Comparison of analytical solutions to numerical calculation results

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