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RESEARCH PAPERS

Parametric Investigation Into the Effects of Pressure, Subcooling, Surface Augmentation and Choice of Coolant on Pool Boiling in the Design of Cooling Systems for High-Power-Density Electronic Chips

[+] Author and Article Information
I. Mudawar, T. M. Anderson

Boiling and Two Phase Flow Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Ind. 47907

J. Electron. Packag 112(4), 375-382 (Dec 01, 1990) (8 pages) doi:10.1115/1.2904392 History: Revised September 15, 1990; Online April 28, 2008

Abstract

A high power electronic chip was simulated experimentally to investigate upper cooling capabilities using a variety of pool boiling enhancement techniques. Parametric effects of system pressure, subcooling, surface augmentation, and choice of coolant on boiling heat transfer from a vertical 12.7 × 12.7 mm2 flat surface were examined. The two fluorocarbon coolants tested, FC-72 and FC-87, resulted in similar boiling curves, but FC-87 significantly reduced chip surface temperature for a given heat flux. Increasing pressure enhanced boiling performance and critical heat flux slightly. However, the significant increase in chip temperature, and the practical problems associated with packaging electronic hardware in a pressurized environment precluded pressurization as a viable enhancement option. Subcooling was very effective in increasing critical heat flux and significantly reducing bubble size and growth of the bubble boundary layer on the chip surface. Surface augmentation was also effective in enhancing critical heat flux; however, some surface geometries promoted noticeable temperature excursion at incipience.

Copyright © 1990 by The American Society of Mechanical Engineers
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