The effect of the dimple shape and orientation on the heat transfer coefficient of a vertical fin surface was determined both numerically and experimentally. The investigation focused on the laminar channel flow between fins, with a and 1000. Numerical simulations were performed using a commercial computational fluid dynamics code to analyze optimum configurations, and then an experimental investigation was conducted on flat and dimpled surfaces for comparison purposes. Numerical results indicated that oval dimples with their “long” axis oriented perpendicular to the direction of the flow offered the best thermal improvement, hence the overall Nusselt number increased up to 10.6% for the dimpled surface. Experimental work confirmed these results with a wall-averaged temperature reduction of up to , which depended on the heat load and the Reynolds number. Pressure losses due to the dimple patterning were also briefly explored numerically in this work.
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Optimization of Fin Performance in a Laminar Channel Flow Through Dimpled Surfaces
Carlos Silva,
Carlos Silva
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
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Doseo Park,
Doseo Park
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
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Egidio (Ed) Marotta,
Egidio (Ed) Marotta
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
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Leroy (Skip) Fletcher
Leroy (Skip) Fletcher
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
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Carlos Silva
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
Doseo Park
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
Egidio (Ed) Marotta
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
Leroy (Skip) Fletcher
Department of Mechanical Engineering,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123J. Heat Transfer. Feb 2009, 131(2): 021702 (9 pages)
Published Online: December 15, 2008
Article history
Received:
December 22, 2007
Revised:
August 14, 2008
Published:
December 15, 2008
Citation
Silva, C., Park, D., Marotta, E. (., and Fletcher, L. (. (December 15, 2008). "Optimization of Fin Performance in a Laminar Channel Flow Through Dimpled Surfaces." ASME. J. Heat Transfer. February 2009; 131(2): 021702. https://doi.org/10.1115/1.2994712
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