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Research Papers

Microstructured Surfaces for Single-Phase Jet Impingement Heat Transfer Enhancement

[+] Author and Article Information
Gilberto Moreno

e-mail: gilbert.moreno@nrel.gov

Kevin Bennion

National Renewable Energy Laboratory,
Golden, CO 80401

1Corresponding author.

Manuscript received February 22, 2012; final manuscript received November 4, 2012; published online June 24, 2013. Assoc. Editor: S. A. Sherif.

J. Thermal Sci. Eng. Appl 5(3), 031004 (Jun 24, 2013) (9 pages) Paper No: TSEA-12-1033; doi: 10.1115/1.4023308 History: Received February 22, 2012; Revised November 04, 2012

An experimental investigation was conducted to examine the use of microstructured surfaces to enhance jet impingement heat transfer. Three microstructured surfaces were evaluated: a microfinned surface, a microporous coating, and a spray pyrolysis coating. The performance of these surface coatings/structures was compared to the performance of simple surface roughening techniques and millimeter-scale finned surfaces. Experiments were conducted using water in both the free- and submerged-jet configurations at Reynolds numbers ranging from 3300 to 18,700. At higher Reynolds numbers, the microstructured surfaces were found to increase Nusselt numbers by 130% and 100% in the free- and submerged-jet configurations, respectively. Potential enhancement mechanisms due to the microstructured surfaces are discussed for each configuration. Finally, an analysis was conducted to assess the impacts of cooling a power electronic module via a jet impingement scheme utilizing microfinned surfaces.

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Figures

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Fig. 1

Schematic of the flow loop (top) and the test section assembly consisting of the nozzle and heated test article (bottom)

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Fig. 2

Schematic of the free-surface (top) and submerged (bottom) jet configurations

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Fig. 3

Digital microscope angled view of the MicroCool structures (left) and scanning electron microscope top view images of the microporous (center) and spray pyrolysis coatings (right)

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Fig. 4

Millimeter-scale finned structures: pin fins (top) and radial fins (bottom). Dimensions shown are in millimeters.

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Fig. 5

Baseline surface Nu number versus Red plots for the free-jet (a) and submerged-jet (b) configurations. The error bars shown represent the 95% confidence intervals for each data set.

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Fig. 6

Nu number versus Red curves for the simply roughened and millimeter-scale finned surfaces in the free-jet configuration

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Fig. 7

Nu number versus Red curves for the microstructured surfaces in the free-jet configuration

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Fig. 8

Nu number versus Red curves for the simply roughened and millimeter-scale finned surfaces in the submerged-jet configuration

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Fig. 9

Nu number versus Red curves for the microstructured surfaces in the submerged-jet configuration

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Fig. 10

Computer-aided design model of the Semikron SKM power electronics module with an aluminum cold plate

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Fig. 11

Power module thermal resistance versus applied cooling area-weighted thermal resistance

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