The paper studies the effect of large louver angles on the performance of large pitch multilouvered fins at low Reynolds numbers. The Reynolds number based on face velocity and louver pitch is varied between 50 and 300. Louver angles are varied from 20° to 60° for fin pitch ratios of 1.5 and 2.0. It is found that increasing louver angle has a favorable effect on flow efficiency up to a certain point, beyond which the flow efficiency decreases. The maximum flow efficiency is realized at smaller louver angles as the Reynolds number increases. The drop in flow efficiency is attributed to the development of recirculation zones which act as blockages. In spite of the decrease in flow efficiency, the heat transfer coefficient increases with louver angle for all the cases studied. It is found that as louver angle increases, impingement heat transfer at the leading surface of louvers becomes a dominant mode of heat transfer. Friction factors also increase with louver angle, primarily due to an increase in form drag.
ASME 2003 Heat Transfer Summer Conference
July 21–23, 2003
Las Vegas, Nevada, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
0-7918-3693-2
PROCEEDINGS PAPER
Effect of Louver Angle in Multi-Louvered Fins at Low Reynolds Numbers
Dahai Guo
,
Dahai Guo
University of Illinois at Urbana-Champaign, Urbana, IL
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Danesh K. Tafti
Danesh K. Tafti
Virginia Polytechnic Institute and State University, Blacksburg, VA
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Author Information
Dahai Guo
University of Illinois at Urbana-Champaign, Urbana, IL
Danesh K. Tafti
Virginia Polytechnic Institute and State University, Blacksburg, VA
Paper No:
HT2003-47035, pp. 621-628; 8 pages
Published Online:
December 17, 2008
Citation
Guo, Dahai, and Tafti, Danesh K. "Effect of Louver Angle in Multi-Louvered Fins at Low Reynolds Numbers." Proceedings of the ASME 2003 Heat Transfer Summer Conference. Heat Transfer: Volume 1. Las Vegas, Nevada, USA. July 21–23, 2003. pp. 621-628. ASME. https://doi.org/10.1115/HT2003-47035
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