Maximizing Heat Transfer Through Joint Fin Systems

[+] Author and Article Information
A.-R. A. Khaled1

Thermal Engineering and Desalination Technology Department,  King AbdulAziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia


Corresponding author. Tel: +966 2 6402000 Ext. 68185; Fax: +966 2 6952182; e-mail: akhaled@kaau.edu.sa

J. Heat Transfer 128(2), 203-206 (Sep 14, 2005) (4 pages) doi:10.1115/1.2137764 History: Received April 29, 2005; Revised September 14, 2005

Heat transfer through joint fins is modeled and analyzed analytically in this work. The terminology “joint fin systems” is used to refer to extending surfaces that are exposed to two different convective media from its both ends. It is found that heat transfer through joint fins is maximized at certain critical lengths of each portion (the receiver fin portion which faces the hot side and the sender fin portion that faces the cold side of the convective media). The critical length of each portion of joint fins is increased as the convection coefficient of the other fin portion increases. At a certain value of the thermal conductivity of the sender fin portion, the critical length for the receiver fin portion may be reduced while heat transfer is maximized. This value depends on the convection coefficient for both fin portions. Thermal performance of joint fins is increased as both thermal conductivity of the sender fin portion or its convection coefficient increases. This work shows that the design of machine components such as bolts, screws, and others can be improved to achieve favorable heat transfer characteristics in addition to its main functions such as rigid fixation properties.

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

Schematic diagram for a joint fin and ordinary extended surfaces

Grahic Jump Location
Figure 2

Variation of the dimensionless heat transfer with the relative length L1∕L and m1L

Grahic Jump Location
Figure 3

Variation of the relative critical length L1*∕L with hf2∕hf1 and k2∕k1 (Eq. 15)



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