“Heat Shield”—An Enhancement Device for an Unshrouded, Forced Convection Heat Sink

[+] Author and Article Information
Suzana Prstic

 Intel Corporation, 5000 W. Chandler Blvd., Chandler, AZ 85226suzana.prstic@intel.com

Avram Bar-Cohen

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742abc@umd.edu

J. Electron. Packag 128(2), 172-176 (Feb 16, 2006) (5 pages) doi:10.1115/1.2188955 History: Received December 10, 2004; Revised February 16, 2006

The inherent advantages of forced air cooling have led to the widespread use of fully and partially shrouded heat sinks for the thermal management of high power microprocessors. The superior thermal performance that is achievable in the fully shrouded configuration is accompanied by a significant pressure drop penalty. The concept introduced in the current study, employs a thin sheet-metal “heat shield,” placed around a partially shrouded heat sink, to channel the flow directly into the heat sink. A combined numerical and experimental study has shown that the use of this “heat shield” can substantially enhance heat sink thermal performance, in a channel geometry and air flow range typical of commercial chip packages; making it comparable to that of a fully shrouded heat sink, with a substantially lower pressure drop (50%). In addition, this thermal enhancement device can be easily retrofitted into existing systems; improving performance without major channel and/or fan modifications.

Copyright © 2004 by IEEE
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Figure 1

Attachment of a shield to a heat sink in a duct side and front view

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Figure 2

Velocity profile through heat sink using shield (note: Velocity legend: Blue color represents 0m∕s; red 3.6m∕s)

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Figure 3

(A) CFD heat sink geometry and (B) ducted heat sink configurations: (a) Fully shrouded, (b) partially shrouded—area ratio 1.21, (c) Partially shrouded—area ratio 1.69

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Figure 4

Horizontal mesh representation in the CFD model

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Figure 5

Experimental setup

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Figure 6

Heat sink assembly

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Figure 7

Heat sink resistance variation with a flow rate

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Figure 8

Experimental and CFD data comparison for different configurations: (a) Fully shrouded, (b) shield, and (c) partially shrouded (AR=1.69)

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Figure 9

Heat sink pressure drop variation with the pressure drop

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Figure 10

Heat sink shield model, Case 1

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Figure 11

Partially shrouded configuration



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