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Technical Briefs

Studies on Optimum Distribution of Fins in Heat Sinks Filled With Phase Change Materials

[+] Author and Article Information
S. K. Saha, K. Srinivasan

Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India

P. Dutta1

Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, Indiapradip@mecheng.iisc.ernet.in

1

Corresponding author.

J. Heat Transfer 130(3), 034505 (Mar 06, 2008) (4 pages) doi:10.1115/1.2804948 History: Received November 06, 2006; Revised July 17, 2007; Published March 06, 2008

This paper deals with phase change material (PCM), used in conjunction with thermal conductivity enhancer (TCE), as a means of thermal management of electronic systems. Eicosane is used as PCM, while aluminium pin or plate fins are used as TCE. The test section considered in all cases is a 42×42mm2 base with a TCE height of 25mm. An electrical heater at the heat sink base is used to simulate the heat generation in electronic chips. Various volumetric fractions of TCE in the conglomerate of PCM and TCE are considered. The case with 8% TCE volume fraction was found to have the best thermal performance. With this volume fraction of TCE, the effects of fin dimension and fin shape are also investigated. It is found that a large number of small cross-sectional area fins is preferable. A numerical model is also developed to enable an interpretation of experimental results.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Thermocouple locations within a TSU with 8% TCE

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Figure 2

(a) Different zones in the experimental temperature graph. Numerical (b) velocity vectors and (c) temperature contours in a sectional view of TSU with 8% (2×2mm2, 36 pin fins) TCE at 8W at 1700s.

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Figure 3

Experimental and numerical temperature histories of the heat source at 4W for pin-fin-type TSUs (fin dimensions: 2×2mm2) having different volumetric fractions of TCE with eicosane as PCM

Grahic Jump Location
Figure 4

Experimental and numerical temperature histories of the heat source at 4W for pin-fin-type and plate-fin-type TSUs with 8% TCE with eicosane as PCM

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