At low to moderate Reynolds numbers, cast pin fin coldwalls provide the best performance and lowest unit cost for air-cooled electronics systems. Until recently, insufficient data existed to design coldwalls with moderate length pin fins for electronics systems. Empirical correlations for the Fanning friction factor, and the Colburn j-factor, were previously developed for two flow regimes with a transition Reynolds number, separating the two regimes. Using these correlations, the effect of configuration on the design is discussed and a design procedure is proposed. Example problems are presented for (1) a system cooled by an environmental control system, and (2) a system cooled by ambient air using a fan.
Issue Section:
Technical Papers
1.
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, R. H.
, and Spofford
, W. A.
, 1942
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.2.
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3.
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4.
VanFossen
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, 1982
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, and VanFossen
, G. J.
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.6.
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, and VanFossen
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,” ASME J. Eng. Gas Turbines Power
, 106
(1
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.7.
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, D. E.
, Berry
, R. A.
, and Bronson
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,” ASME J. Heat Transfer
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.8.
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9.
Metzger, D. E., and Haley, S. W., 1982, “Heat Transfer Experiments and Flow Visualization for Arrays of Short Pin Fins,” ASME Paper 82-GT-138.
10.
Arora, S. C., and Abdel Messeh, W., 1983, “Heat Transfer Experiments in High Aspect Ratio Rectangular Channel With Epoxied Short Pin Fins,” ASME Paper No. 83-GT-57.
11.
Arora, S. C., and Abdel Messeh, W., 1985, “Pressure Drop and Heat Transfer Characteristics of Circular and Oblong Low Aspect Ratio Pin Fins,” Proc. NATO AGARD Conference, Paper No. 390, pp. 4-1–4-15, May 6–10.
12.
Peng
, Y.
, 1984
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,” ASME J. Eng. Gas Turbines Power
, 106
, pp. 246
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.13.
Wang, B. G., and Ji, H. H., 1987, “Experimental Investigation of Heat Transfer and Friction Loss in Taper Pin Fin Configurations of Air Cooled Turbine Blades,” Proc. 1987 ASME-JSME Thermal Engineering Joint Conference, Honolulu, HI, Mar 22–27, Vol. 4., pp. 127–133.
14.
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, E. M.
, and Grannis
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16.
Jubran
, B. A.
, Hamdan
, M. A.
, and Abdullah
, R. M.
, 1993
, “Enhanced Heat Transfer, Missing Pin, and Optimization for Cylindrical Pin Fin Arrays
,” ASME J. Heat Transfer
, 115
, pp. 576
–583
.17.
Short, B. E., Jr., Raad, P. E., and Price, D. C., 1994, “Pressure Drop and Heat Transfer in Cast Pin Fin Coldwalls Used for Electronics Cooling,” Proc. 1994 International Mechanical Engineering Congress and Exposition, Chicago, IL, Nov 6–11, HTD 292, pp. 105–113.
18.
Short
, Jr., B. E.
, Raad
, P. E.
, and Price
, D. C.
, 2002
, “Performance of Pin Fin Coldwalls Constructed of Cast Aluminum: Part I—Friction Factor Correlations
,” J. Thermophys. Heat Transfer
, 16
(3
), July–September, pp. 389
–396
.19.
Short
, Jr., B. E.
, Raad
, P. E.
, and Price
, D. C.
, 2001
, “Performance of Pin Fin Coldwalls Constructed of Cast Aluminum: Part II—Colburn j-Factor Correlations
,” J. Thermophys. Heat Transfer
, 16
(3
), July–September, pp. 397
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.20.
EG&G ROTRON, 1988, MIL GRADE FANS AND BLOWERS, EG&G ROTRON, Custom Division, ROTRON INC., Woodstock, New York.
21.
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