Heat transfer through rectangular permeable fins is modeled and analyzed theoretically in this work. The free stream fluid flow is considered to be normal to the upper surface of the permeable fin. The flow across the permeable fin is permitted in this work. The continuity, momentum, and energy equations are solved for the fluid flow using a similarity transformation and an iterative tridiagonal finite difference method. As such, a correlation for the Nusselt number is generated as functions of the Prandtl number (Pr) and dimensionless suction velocity for and , respectively. The energy equation for the permeable fin is generated and solved analytically using the developed correlation. It was found that permeable fins may have superiority in transferring heat over ordinary solid fins, especially at large values and moderate holes-to-fin surface area ratios. In addition, the critical holes-to-fin surface area ratios, below which the permeable fins transfer more heat than solid fins, is found to increase as Pr and increase. Finally, this work paves a way for a new passive method for enhancing heat transfer.
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Investigation of Heat Transfer Enhancement Through Permeable Fins
A.-R. A. Khaled
A.-R. A. Khaled
Department of Thermal Engineering and Desalination Technology,
e-mail: akhaled@kau.edu.sa
King Abdulaziz University
, P.O. Box 80204, Jeddah 21589, Saudi Arabia
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A.-R. A. Khaled
Department of Thermal Engineering and Desalination Technology,
King Abdulaziz University
, P.O. Box 80204, Jeddah 21589, Saudi Arabiae-mail: akhaled@kau.edu.sa
J. Heat Transfer. Mar 2010, 132(3): 034503 (5 pages)
Published Online: December 29, 2009
Article history
Received:
April 10, 2009
Revised:
July 30, 2009
Online:
December 29, 2009
Published:
December 29, 2009
Citation
Khaled, A. A. (December 29, 2009). "Investigation of Heat Transfer Enhancement Through Permeable Fins." ASME. J. Heat Transfer. March 2010; 132(3): 034503. https://doi.org/10.1115/1.4000056
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