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Research Papers: Forced Convection

Optimization of Fin Performance in a Laminar Channel Flow Through Dimpled Surfaces

[+] Author and Article Information
Carlos Silva, Doseo Park, Egidio (Ed) Marotta, Leroy (Skip) Fletcher

Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843-3123

J. Heat Transfer 131(2), 021702 (Dec 15, 2008) (9 pages) doi:10.1115/1.2994712 History: Received December 22, 2007; Revised August 14, 2008; Published December 15, 2008

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 Re=500 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 3.7K, 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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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Dimple geometry and array spacing. In (e) the smaller dimple diameter is 0.375. All dimensions are in millimeters.

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Figure 2

Grid structure for the Oval dimple 2

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Figure 3

Temperature distribution in the flat surface of the heat sink fin. Fluid flow is from left to right. Heat flow is from the bottom.

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Figure 4

Temperature distribution over the dimpled surfaces. Temperature legend is the same as in Fig. 3. Fluid flow is from the left to right. Heat flow is from the bottom to the top. (a) Circular dimples, (b) Oval dimple 1-horizontal, (c) Oval dimple 2-horizontal, (d) Oval dimple 3-horizontal, (e) Double dimples, (f) Oval dimple 1-vertical, (g) Oval dimple 2-vertical, and (h) Oval dimple 3-vertical.

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Figure 5

Flat and dimple test plates

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Figure 6

Thermocouple locations in test plates

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Figure 7

Schematic of the experimental setup

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Figure 8

Flow structure over dimples, Re=500

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