Design of Cast Pin Fin Coldwalls for Air-Cooled Electronics Systems
Author:
Short, B. Elliott1, Price Donald C.1, Raad Peter E.2
Affiliation:
1. Raytheon Company, McKinney, TX 75070 2. Department of Mechanical Engineering, Southern Methodist University, Dallas, TX 75275-0337
Abstract
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, f=fS/d,T/d,L/d,Red, and the Colburn j-factor, j=jS/d,T/d,L/d,Red, were previously developed for two flow regimes with a transition Reynolds number, Retrn, 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.
Publisher
ASME International
Subject
Electrical and Electronic Engineering,Computer Science Applications,Mechanics of Materials,Electronic, Optical and Magnetic Materials
Reference21 articles.
1. Norris, R. H., and Spofford, W. A., 1942, “High-Performance Fins for Heat Transfer,” Trans. ASME, 64, pp. 489–496. 2. Kays, W. M., 1953, “Pin-Fin Heat Exchanger Surfaces,” Technical Report No. 19, Dept. of Mechanical Engineering, Stanford University, Stanford, CA. 3. Kays, W. M., and London, A. L., 1984, Compact Heat Exchangers, 3d ed., McGraw-Hill, Inc. 4. VanFossen, G. J.
, 1982, “Heat Transfer Coefficients for Staggered Arrays of Short Pin Fins,” ASME J. Eng. Power, 104, pp. 268–274. 5. Simoneau, R. J., and VanFossen, G. J., 1984, “Effect of Location in an Array on Heat Transfer to a Short Cylinder in Crossflow,” ASME J. Heat Transfer, 106, pp. 42–48.
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