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TECHNICAL PAPERS

Experiments on Chimney-Enhanced Free Convection From Pin-Fin Heat Sinks

[+] Author and Article Information
W. W. Thrasher, T. S. Fisher, K. E. Torrance

Sibley School of Mechanical & Aerospace Engineering, Upson Hall, Cornell University, Ithaca, NY 14853

J. Electron. Packag 122(4), 350-355 (Feb 10, 2000) (6 pages) doi:10.1115/1.1289633 History: Received August 05, 1998; Revised February 10, 2000
Copyright © 2000 by ASME
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References

Figures

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Dimensioned pin-fin heat sink drawing
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Isometric view of the heat-sink/chimney system
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Temperature rise above ambient as a function of power dissipation for two heat sinks, ϕ=94.3 percent and 88.1 percent, and three chimney heights, HC=0 mm, 100 mm, and 233 mm
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Nondimensional temperature rise θmax as a function of the modified Rayleigh number Ra for three heat sinks ϕ=88.1 percent, 91.0 percent and 94.3 percent and three chimney heights HC=0, 100, and 233 mm. Solid lines represent theoretical predictions of Fisher and Torrance 1.
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Nondimensional thermal resistance R as a function of heat-sink porosity ϕ for three chimney heights HC=0, 100, and 233 mm. Solid lines represent theoretical predictions from Fisher and Torrance 1.
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Fluid velocity as a function of location at the chimney exit and heating power. Heat sink porosity ϕ=94.3 percent. Chimney height HC=233 mm.

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