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RESEARCH PAPERS

Heat-Transfer Optimization for Multichip Module Disks With an Unconfined Round Air Jet Impingement

[+] Author and Article Information
Y. C. Lee, C. J. Fang, M. C. Wu, C. H. Peng

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, R.O.C

Y. H. Hung1

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, R.O.Cyhhung@pme.nthu.edu.tw

1

Corresponding author.

J. Electron. Packag 129(4), 411-420 (Jan 25, 2007) (10 pages) doi:10.1115/1.2804089 History: Received July 10, 2006; Revised January 25, 2007

An effective method for performing the thermal optimization of stationary and rotating multichip module (MCM) disks with an unconfined round-jet impingement under space limitation constraint has been successfully developed. The design variables of stationary and rotating MCM disks with an unconfined round-jet impingement include the ratio of jet separation distance to nozzle diameter, Grashof number, jet Reynolds number, and rotational Reynolds number. The total experimental cases for stationary and rotating MCM disks are statistically designed by the central composite design method. In addition, a sensitivity analysis, the so-called analysis of variance, for the design factors has been performed. Among the influencing parameters, the jet Reynolds number dominates the thermal performance, while the Grashof number is found to have the least effect on heat-transfer performance for both stationary and rotating cases. Furthermore, the comparisons between the predictions by using the quadratic response surface methodology and the experimental data for both stationary and rotating cases are made with a satisfactory agreement. Finally, with the sequential quadratic programming technique, a series of thermal optimizations under multiconstraints—such as space, jet Reynolds number, rotational Reynolds number, nozzle exit velocity, disk rotational speed, and various power consumptions—has been systematically explored and discussed.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 6

Model accuracy plot for average Nusselt number of rotating MCM disk

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Figure 7

Thermal optimization plot for Case I stationary cases in the experimental range of design variables

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Figure 8

Thermal optimization plot for Case II rotating cases in the experimental range of design variables

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Figure 9

Thermal optimization plot for Case III rotating cases with multiconstraints of H∕d, Rej, and Rer

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Figure 10

Thermal optimization plot for Case IV rotating cases with multiconstraints of H∕d, Pj, and Pr

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Figure 11

Thermal optimization plot for Case V rotating cases with multiconstraints of H∕d and Pt

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Figure 1

Schematic of unconfined round jet impinging onto a heated MCM disk

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Figure 2

CCD for two factors

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Figure 3

Contribution of design variables on transient average Nusselt number of stationary MCM disk

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Figure 4

Contribution of design variables on transient average Nusselt number of rotating MCM disk

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Figure 5

Model accuracy plot for average Nusselt number of stationary MCM disk

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