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RESEARCH PAPERS

Heat Transfer Behavior for a Stationary or Rotating MCM Disk With an Unconfined Round Jet Impingement

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

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

Y. H. Hung1

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

1

Corresponding author.

J. Electron. Packag 129(4), 400-410 (Dec 28, 2006) (11 pages) doi:10.1115/1.2804087 History: Received July 10, 2006; Revised December 28, 2006

A series of experimental investigations on the studies related to fluid flow and transient mixed convection from a horizontally unconfined stationary or rotating ceramic-based multichip module (MCM) disk with unconfined jet impingement have been successfully conducted. The fluid flow and heat transfer behavior explored includes the streamwise velocity and turbulence intensity distributions, transient dimensionless temperature distribution on the MCM disk surface, transient heat flux distribution of input power, and transient chip and average heat transfer characteristics on the MCM disk surface. Besides, two new correlations of transient stagnation and average Nusselt numbers in terms of jet Reynolds number, ratio of jet separation distance to nozzle diameter and time elapsed during the transient period, are presented for the cases of stationary MCM disk. For the cases of rotating MCM disk, a complete composite correlation of steady-state average Nusselt number for mixed convection due to jet impingement, disk rotation and buoyancy is proposed. As compared with the steady-state results, if the transient chip and average heat transfer behaviors may be considered as a superposition of a series of quasisteady states, the transient chip and average Nusselt numbers in all the present transient experiments can be properly predicted by the existing steady-state correlations when t>6min in the power-on transient period.

Copyright © 2007 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

Schematic of round jet chamber and nozzle

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Figure 3

Schematic of test block and its components

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Figure 4

Schematic of rotating facility

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Figure 5

Schematic of test section in mixed convection due to disk rotation, jet impingement, and buoyancy

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Figure 6

Jet streamwise velocity distributions at nozzle exit for a stationary or rotating MCM disk with unconfined jet impingement

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Figure 7

Turbulence intensity distributions at nozzle exit for a stationary or rotating MCM disk with unconfined jet impingement

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Figure 8

Dimensionless steady-state chip temperature distributions on a rotating MCM disk with unconfined jet impingement for various jet Reynolds numbers

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Figure 9

Transient heat flux distributions at r∕R=0 for typical case during transient period

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Figure 10

Effect of jet Reynolds number on transient Nusselt number at r∕R=0 for a stationary MCM disk with unconfined jet impingement

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Figure 11

Comparison of the jet centerline velocity and turbulence intensity distributions along the streamwise direction for unconfined (L∕d=20) and confined (L∕d=2) cases

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Figure 12

Effect of jet Reynolds number on distribution of steady-state chip Nusselt numbers for a rotating MCM disk with unconfined jet impingement

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Figure 13

Effect of jet Reynolds number on transient average Nusselt number of stationary MCM disk with unconfined jet impingement

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Figure 14

Effect of H∕d ratio on transient average Nusselt number of stationary MCM disk with unconfined jet impingement

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Figure 15

Effect of jet Reynolds number on transient average Nusselt number of rotating MCM disk with unconfined jet impingement

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