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RESEARCH PAPERS

Optimization Study for a Parallel Plate Impingement Heat Sink

[+] Author and Article Information
Amit Shah1

Electronic Speciality Technologies Lab, Electronics Reliability Center of Excellence, General Electric India Technology Centre Pvt. Ltd., Bangalore 560 066, India

Bahgat G. Sammakia2

Thomas J. Watson School of Engineering, Binghamton University, State University of New York, P.O. Box: 6000, Binghamton, NY 13902-6000

K. Srihari

Thomas J. Watson School of Engineering, Binghamton University, State University of New York, P.O. Box: 6000, Binghamton, NY 13902-6000

K. Ramakrishna2

Interconnect Reliability, Austin Silicon Technology Solutions, Technology Solutions Organization, Freescale Semiconductor, Inc., 3501 Ed Bluestein Boulevard, Austin, TX 78721k.ramakrishna@freescale.com

1

The work was performed while the author was with the State University of New York at Binghamton, NY.

2

Author for correspondence.

J. Electron. Packag 128(4), 311-318 (Feb 06, 2006) (8 pages) doi:10.1115/1.2351893 History: Received November 18, 2003; Revised February 06, 2006

A previous study by the authors on fin-shape optimization of a plate fin heat sink has concluded that a depopulated central zone, just under the center of the fan, provides a better thermal performance compared to the heat sink geometries with fin material under the fan. This study extends the previous work by investigating the effect of removal of fin material from the end fins, the total number of fins, and the reduction in the size of the hub fan. From this study, it is concluded that the removal of fin material from the end fins results in a better thermal and hydraulic performance of the heat sink. The reduction in the size of the hub causes a more uniform distribution of air inside the heat sink. The increase in the number of fins indicates a slightly better thermal performance, accompanied by a considerably increased pressure drop. Finally, a new optimal heat sink design has been reported by employing the actual fan operating characteristics.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram depicting a side view of the original heat sink and blower housing assembly (not to scale)

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Figure 2

(a) Original heat sink design II (without the blower) and (b) optimal heat sink design I (without the blower and one end fin)

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Figure 3

Schematic diagram of the front view of the entire model

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Figure 4

(a) End fin cut up to the base and 4mm along its length and (b) End fin cut up to 11mm above the base and 4mm along its length

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Figure 5

Results of end fin modification: Comparison of temperature rise for five different heat sink designs

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Figure 6

Effect of end fin modifications on junction temperature rise, pressure, and entropy generation

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Figure 8

Results of end fin cuts

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Figure 9

End fin results: Pressure drop, die junction to ambient temperature difference and entropy generation index as a function of heat sink surface area

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Figure 10

Fin study: Effect of varying the number of fins

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Figure 11

Air circulation under the fan: (a) original hub, (b) 75% of original hub, and (c) 50% of original hub

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Figure 12

uz, axial velocity under the fan with varying hub dimensions

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Figure 13

Air pressure drop under the fan air pressure just below the fan for the three cases with varying hub dimensions

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Figure 14

Characteristic fan curve

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