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Optimal Package Design of Stacks of Convection-Cooled Printed Circuit Boards Using Entropy Generation Minimization Method

[+] Author Affiliations
Wen Jei Yang, Takahiro Furukawa

University of Michigan, Ann Arbor, MI

Shuichi Torii

Kumamoto University, Kumamoto, Japan

Paper No. HT2007-32195, pp. 479-485; 7 pages
doi:10.1115/HT2007-32195
From:
  • ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference
  • ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 1
  • Vancouver, British Columbia, Canada, July 8–12, 2007
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4274-6 | eISBN: 0-7918-3801-3
  • Copyright © 2007 by ASME

abstract

Thermal optimization of a stack of printed circuit boards using entropy generation minimization (EGM) method is presented. The study consists of two parts. One is focused on the entropy generation of a module in periodically fully-developed channel flow (PDF), while the other is the optimization applied to electronic packages composed of a stack of printed circuit boards. In the process of optimizing electronics packaging, consideration is given to two constraints which are the maximum junction temperature specified by a chip manufacturer and the allowable pressure difference across the channel maintained by cooling fans. The Reynolds number, block geometry and bypass flow area ratio are varied to search for an optimal channel spacing using the EGM method whose validity is borne out by comparing with those obtained by the conventional thermal optimization (or overall thermal conductance) method. A dimensionless optimal board spacing parameter C is derived which involves the relative migration speed (or time) of heat transfer and viscous friction over the PDF channel length. A correlation equation is derived which expresses C in terms of the Reynolds number and block geometry. This equation can be employed in the optimal design of electronic packages.

Copyright © 2007 by ASME

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