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Technical Briefs

Evaluation of Compact and Effective Air-Cooled Carbon Foam Heat Sink

[+] Author and Article Information
W. Wu, J. H. Du, Y. R. Lin

Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450

L. C. Chow1

Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450lchow@mail.ucf.edu

H. Bostanci, B. A. Saarloos, D. P. Rini

 RINI Technologies, Inc., Oviedo, FL 32765-4303

1

Corresponding author.

J. Heat Transfer 133(5), 054504 (Feb 02, 2011) (5 pages) doi:10.1115/1.4003193 History: Received May 10, 2010; Revised November 14, 2010; Published February 02, 2011; Online February 02, 2011

This study investigates a V-shaped corrugated carbon foam heat sink for thermal management of electronics with forced air convection. Experiments were conducted to determine the heat sink performance in terms of heat transfer coefficient and pressure drop. The test section, with overall dimensions of 51mmL×51mmW×19mmH, enabled up to 166 W of heat dissipation, and 3280W/m2K and 2210W/m2K heat transfer coefficients, based on log mean and air inlet temperatures, respectively, at 7.8 m/s air flow speed, and 1320 Pa pressure loss. Compared to a solid carbon foam, the V-shaped corrugated structure enhances the heat transfer, and at the same time reduces the flow resistance. Physical mechanisms underlying the observed phenomena are briefly explained. With benefits that potentially can reduce overall weight, volume, and cost of the air-cooled electronics, the present V-shaped corrugated carbon foam emerges as an alternative heat sink.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 6

Performance comparison of various carbon foam heat sink designs. (Legend denotes structure type, and h1 and ΔP at 4.4 m/s flow speed.)

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Figure 7

Performance comparison of various carbon foam heat sink designs based on Colburn-J factor (J) and Fanning friction factor (f)

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Figure 5

Heat transfer coefficient and flow resistance of V-shaped corrugated carbon foam as a function of air flow speed

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Figure 4

Details of V-shaped corrugated structure

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Figure 3

(a) Heater and (b) heater-carbon foam assembly

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Figure 2

SEM image of carbon foam (courtesy of Gallego and Klett (3))

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Figure 1

Schematic of the experimental setup

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