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Research Papers: Electronic Cooling

A Novel Approach to Low Profile Heat Sink Design

[+] Author and Article Information
Jason Stafford1

Department of Mechanical and Aeronautical Engineering, Stokes Institute, University of Limerick, Limerick, Irelandjason.stafford@ul.ie

Ed Walsh, Vanessa Egan, Pat Walsh

Department of Mechanical and Aeronautical Engineering, Stokes Institute, University of Limerick, Limerick, Ireland

Yuri S. Muzychka

Faculty of Engineering, Memorial University of Newfoundland, St. John's, NL, A1B 3X5, Canada

1

Corresponding author.

J. Heat Transfer 132(9), 091401 (Jun 29, 2010) (8 pages) doi:10.1115/1.4001626 History: Received July 29, 2009; Revised January 26, 2010; Published June 29, 2010; Online June 29, 2010

This paper discusses the importance of developing cooling solutions for low profile devices. This is addressed with an experimental and theoretical study on forced convection cooling solution designs that could be implemented into such devices. Conventional finned and corresponding finless designs of equal exterior dimensions are considered for three different heat sink profiles ranging from 1 mm to 4 mm in combination with a commercially available radial blower. The results show that forced convection heat transfer rates can be enhanced by up to 55% using finless designs at low profiles with relatively small footprint areas. Overall, this paper provides optimization and geometry selection criteria, which are relevant to designers of low profile cooling solutions.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Fan performance curve at fan speed of 7000 rpm

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Figure 2

Schematic of (a) finned and(b) finless heat sink designs showing the common dimensions along with the varied parameters H and L. Dimensions in millimeters.

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Figure 3

Finned (left) and finless heat sink designs

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Figure 4

Finned (top) and finless heat sinks showing reductions in profile height

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Figure 5

Heat sink performance curves

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Figure 6

Normalized finned heat sink mass flow rates showing predictions based on measured and manufacturers fan performance data

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Figure 7

Finned and finless heat sink thermal resistances

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Figure 8

Forced convection Nusselt number, based on the inlet temperature difference, in both the entrance and fully developed region of an isothermal heat sink

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Figure 9

Ratio of heat transfer rates—H=4 mm

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Figure 10

Ratio of heat transfer rates—H=2 mm

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Figure 11

Ratio of heat transfer rates—H=1 mm

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