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RESEARCH PAPERS: Micro/Nanoscale Heat Transfer

Thermal-Hydraulic Performance of MEMS-based Pin Fin Heat Sink

[+] Author and Article Information
Ali Koşar

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

Yoav Peles1

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180pelesy@rpi.edu

1

Corresponding author.

J. Heat Transfer 128(2), 121-131 (Aug 08, 2005) (11 pages) doi:10.1115/1.2137760 History: Received March 03, 2005; Revised August 08, 2005

An experimental study on heat transfer and pressure drop of de-ionized water over a bank of shrouded staggered micro pin fins 243μm long with hydraulic diameter of 99.5μm has been performed. Average heat transfer coefficients have been obtained for effective heat fluxes ranging from 3.8 to 167Wcm2 and Reynolds numbers from 14 to 112. The results were used to derive the Nusselt numbers, total thermal resistances, and friction factors. It has been found that for Reynolds numbers below 50 long tube correlations overpredicted the experimental Nusselt number, while at higher Reynolds numbers existing correlations predicted the results moderately well. Endwall effects, which diminish at high Reynolds numbers, and a delay in flow separation for compact pin fins were attributed to the obtained trend.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) CAD model of the micro pin fin heat sink. (b) Heater dimensions (dimensions in mm). (c) Top view of the device (dimensions in μm).

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Figure 2

Micro pin fin heat sink fabrication process (not to scale)

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Figure 3

Experimental setup

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Figure 5

Average temperature as a function of electrical resistance

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Figure 6

(a) Heat loss calibration curve. (b) Heat loss curve for Re=112.

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Figure 7

T ¯−Ti(∘C) versus q″ profile

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Figure 8

Average heat transfer coefficient as a function of heat flux

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Figure 9

hav,exp∕h ¯ versus q″ profile

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Figure 10

Average Nusselt number as a function of Reynolds number

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Figure 11

Total thermal resistance as a function of Reynolds number

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Figure 12

Pressure drop as a function of volumetric flow rate

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Figure 13

Friction factor predictions of existing correlations

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