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TECHNICAL PAPERS

Local Heat Transfer Distributions in Confined Multiple Air Jet Impingement

[+] Author and Article Information
Suresh V. Garimella

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288e-mail: sureshg@ecn.purdue.edu

Vincent P. Schroeder

Department of Mechanical Engineering, University of Wisconsin–Milwaukee, Milwaukee, WI 53201

J. Electron. Packag 123(3), 165-172 (Dec 26, 2000) (8 pages) doi:10.1115/1.1371923 History: Received November 01, 1998; Revised December 26, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic diagram of the air jet impingement experimental facility
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Jet arrays and heat source orientation for the multiple-jet experiments
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Local heat transfer coefficient distributions for the 9×1.59 mm array (open symbols) at Re=15,000 and H/d=4. The dashed vertical lines indicate the centers of the array jets located at r/d=0, 4, and 4√2 (S/d=4). Single-jet results at the same Re and H/d are plotted for comparison (solid symbols).
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Local heat transfer coefficient distribution for the 4×3.18 mm array (open symbols) at Re=20,000 and H/d=4. The dashed vertical line indicates the center of any jet in the array, located at r/d=2√2,(S/d=4); the vertical dotted line indicates the center of the heater. Single-jet results at the same Re and H/d are plotted for comparison (solid symbols).
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Variation in the 9×1.59 mm array heat transfer coefficients with orifice-target spacing for Re=15,000 (top) and 5000 (bottom)
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Variation in the 4×3.18 mm array heat transfer coefficients with orifice-target spacing for Re=20,000 (top) and 5000 (bottom)
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Effect of Reynolds number on the 9×1.59 mm array heat transfer coefficients for H/d=4 (top) and 1 (bottom). Single-jet results at the same Re and H/d are plotted for comparison (solid symbols).
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Effect of Reynolds number on the 4×3.18 mm array heat transfer coefficients for H/d=4 (top) and 0.5 (bottom). Single-jet results at the same Re and H/d are plotted for comparison (solid symbols).
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Influence of interjet spacing (S/d) on the heat transfer coefficient for the 4×3.18 mm array at H/d=4 (top) and 0.5 (bottom) and Re=20,000
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The proposed correlation for the array area-averaged Nusselt numbers (Eq. 5) and the experimental results for all the tests in this study
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Comparison of the area-averaged Nusselt numbers from the present study with the predictions of (a) Huber and Viskanta 6 and (b) Martin 18
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Comparison of heat transfer coefficients for a single 3.18 mm jet (solid symbols) with the 4×3.18 mm jet array (open symbols) at constant flow rate (ṁ≈9×10−04 kg/s) at H/d=4 (top) and 0.5 (bottom)
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Comparison of heat transfer coefficients for a single 1.59 mm jet (solid symbols) with the 9×1.59 mm jet array (open symbols) at constant flow rate (ṁ≈3.4×10−04 kg/s) at H/d=4 (top) and 1 (bottom)

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