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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

Fisher,  T. S., and Torrance,  K. E., 1998, “Free Convection Limits for Pin-Fin Cooling,” ASME J. Heat Transfer, 120, pp. 633–640.
Taylor, M. T., 1984, “Experimental Comparison of Pin Fin Configurations for Extended Surface Heat Transfer in Space Applications,” Proceedings of the 4th International Electronics Packaging Conference, Baltimore, pp. 441–467.
Sparrow,  E. M., and Vemuri,  S. B., 1985, “Natural Convection/Radiation Heat Transfer from Highly Populated Pin Fin Arrays,” ASME J. Heat Transfer, 107, pp. 190–197.
Aihara,  T., Maruyama,  S., and Kobayakawa,  S., 1990, “Free Convective/Radiative Heat Transfer from Pin-Fin Arrays with a Vertical Base Plate (General Representation of Heat Transfer Performance),” Int. J. Heat Mass Transf., 33, pp. 1223–1232.
Zografos,  A. I., and Sunderland,  J. E., 1990, “Natural Convection from Pin Fin Arrays,” Exp. Therm. Fluid Sci., 3, pp. 440–449.
Armstrong,  J., and Winstanley,  D., 1988, “A Review of Staggered Array Pin Fin Heat Transfer for Turbine Cooling Applications,” ASME J. Turbomach., 110, pp. 94–103.
Zukauskas, A., 1987, “Convective Heat Transfer in Cross Flow,” Handbook of Single-Phase Convective Heat Transfer, Wiley, New York, Chap. 6.
Fisher,  T. S., Torrance,  K. E., and Sikka,  K. K., 1997, “Analysis and Optimization of a Natural Draft Heat Sink System,” IEEE Trans. Compon., Packag. Manuf. Technol., Part A, 20, pp. 111–119.
Fisher,  T. S., and Torrance,  K. E., 1999, “Experiments on Chimney-Enhanced Free Convection,” ASME J. Heat Transfer, 121, pp. 603–609.
Sikka, K. K., Torrance, K. E., and Fisher, T. S., 1996, “Thermal Management Laboratory at the Advanced Facility for Electronic Packaging,” Tech. Rep. E-96-03, Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY.
Kline,  S. L., and McClintock,  F. A., 1953, “Describing Uncertainties in Single-Sample Experiments,” Mech. Eng. (Am. Soc. Mech. Eng.), 75, pp. 3–8.
DISA, 1985, DISA 55D90 Calibration Equipment Instruction Manual, DISA/DANTEC, Inc.
Thrasher, W. W., Fisher, T. S., and Torrance, K. E., 1998, “Chimney Enhanced Convection of Pin-Fin Heat Sinks,” Tech. Rep. E-98-04, Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY.
Modi,  V., and Torrance,  K. E., 1987, “Experimental and Numerical Studies of Cold Inflow at the Exit of Buoyant Channel Flows,” ASME J. Heat Transfer, 109, pp. 392–399.

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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