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RESEARCH PAPERS

Cooling Performance of Using a Confined Slot Jet Impinging onto Heated Heat Sinks

[+] Author and Article Information
Ta-Wei Lin, Ming-Chang Wu, Li-Kang Liu, Chun-Jen Fang

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan

Ying-Huei Hung1

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwanyhhung@pme.nthu.edu.tw

1

Corresponding author.

J. Electron. Packag 128(1), 82-91 (Jun 04, 2005) (10 pages) doi:10.1115/1.2161426 History: Received January 19, 2005; Revised June 04, 2005

A series of experimental investigations on the studies related to transient- and steady-state cooling performance from the horizontally heated heat sinks with a confined slot jet impingement have been conducted. The relevant parameters influencing the transient convective cooling performance include the steady-state Grashof number, ratio of jet separation distance to nozzle width, ratio of heat sink height to nozzle width, and jet Reynolds number. The transient heat transfer behaviors such as the temperature distribution, local and average Nusselt numbers on the heated heat sinks have been systematically explored. Two empirical correlations of steady-state local and average Nusselt numbers are presented. Furthermore, a complete composite correlation of steady-state average Nusselt number for mixed convection due to jet impingement and buoyancy is proposed. This empirical correlation obtained by data regression is in good agreement with the experimental data. The maximum and average regression errors are 7.46% and 2.87%, respectively.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of overall experimental setup

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Figure 2

Test block of heated extended test surface

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Figure 3

Schematic of the heated heat sink with relevant definition of parameters

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Figure 4

Normalized velocity distribution at nozzle exit (Z∕W=1)

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Figure 5

Transient dimensionless temperature distributions on the base surface of the heated heat sinks for a typical case

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Figure 6

Effects of Hes∕W and ReD on transient convective heat flux distribution at x∕W=0

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Figure 7

Effect of Grs on transient Nusselt number at x∕W=0

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Figure 8

Effect of H∕W ratio on transient Nusselt number at x∕W=0

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Figure 9

Effect of Hes∕W ratio on transient Nusselt number at x∕W=0

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Figure 10

Effect of jet Reynolds number on transient Nusselt number at x∕W=0

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Figure 11

Distributions of transient local nusselt number along streamwise direction

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Figure 12

Distribution of dimensionless local steady-state Nusselt number for various ReD values

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Figure 13

Heat transfer enhancement for heated heat sinks with confined slot jet impingement

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Figure 14

Composite correlation of steady-state average Nusselt number for confined heated heat sink with slot jet impingement

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