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Design of Cast Pin Fin Coldwalls for Air-Cooled Electronics Systems

[+] Author Affiliations
B. Elliott Short, Jr., Donald C. Price

Raytheon Company, McKinney, TX

Peter E. Raad

Southern Methodist University, Dallas, TX

Paper No. IPACK2003-35004, pp. 47-55; 9 pages
  • ASME 2003 International Electronic Packaging Technical Conference and Exhibition
  • 2003 International Electronic Packaging Technical Conference and Exhibition, Volume 2
  • Maui, Hawaii, USA, July 6–11, 2003
  • Conference Sponsors: Electronic and Photonic Packaging Division
  • ISBN: 0-7918-3690-8 | eISBN: 0-7918-3674-6
  • Copyright © 2003 by ASME


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 = f(S/d, T/d, L/d, Red ), and the Colburn j-factor, j = j(S/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.

Copyright © 2003 by ASME
Topics: Design , Electronics



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