Research Papers

Analysis of Heat Transfer Enhancement in Minichannel Heat Sinks With Turbulent Flow Using H2OAl2O3 Nanofluids

[+] Author and Article Information
T. L. Bergman

Department of Mechanical Engineering, University of Connecticut, 191 Auditorium Road, Unit 3139, Storrs, CT 06269tberg@engr.uconn.edu

J. Electron. Packag 131(2), 021008 (Apr 02, 2009) (5 pages) doi:10.1115/1.3103949 History: Received May 06, 2008; Revised October 20, 2008; Published April 02, 2009

Heat transfer enhancement associated with use of a nanofluid coolant is analyzed for small electronic heat sinks. The analysis is based on the ε-NTU heat exchanger methodology, and is used to examine enhancement associated with use of H2OAl2O3 nanofluids in a heat sink experiencing turbulent flow. Predictive correlations are generated to ascertain the degree of enhancement based on the fluid’s thermophysical properties. The enhancement is quite small, suggesting the limited usefulness of nanofluids in this particular application.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Heat sink schematic (N=5) and nomenclature. Shaded surfaces are insulated.

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Figure 2

Comparison of pressure drop and modified thermal resistance predicted by the current model and in Ref. 14

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Figure 3

Heat flux versus mean velocity of the base fluid for the Cu (open circle) and Al (open square) heat sinks. Results are shown for the base fluid (φ=0), the nanofluid with the same mean velocity as the base fluid (φ=0.05 and um,nf=um,bf) and the nanofluid with Δpnf=Δpbf and φ=0.05.

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Figure 6

Variation in RεCmin with RUA for a 20×20 mm2 Cu heat sink with um,bf=4 m/s

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Figure 5

Variation in Rε, RCmin, and RεCmin with nanoparticle volume fraction, φ and um,bf=4 m/s. Symbols are predictions for a 20×20 mm2 Cu heat sink (closed squares), 40×40 mm2 Cu heat sink (closed circles), 20×20 mm2 Al heat sink (open squares), and 40×40 mm2 Al heat sink (closed squares).

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Figure 4

Variation in Rε, RCmin, and RεCmin with nanoparticle volume fraction, φ, for the 20×20 mm2 Cu heat sink with um,bf=2 m/s (solid squares), 4 m/s (open circles), and 6 m/s (open squares)




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