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Enhanced Boiling Heat Transfer in Second Generation Microchannels: Part B — Sub-Atmospheric Results

[+] Author Affiliations
Ali Kosar, Chih-Jung Kuo, Yoav Peles, Michael K. Jensen

Rensselaer Polytechnic Institute, Troy, NY

Paper No. ICMM2005-75196, pp. 529-536; 8 pages
doi:10.1115/ICMM2005-75196
From:
  • ASME 3rd International Conference on Microchannels and Minichannels
  • ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B
  • Toronto, Ontario, Canada, June 13–15, 2005
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4185-5 | eISBN: 0-7918-3758-0
  • Copyright © 2005 by ASME

abstract

Boiling flow of de-ionized water through 227 μm hydraulic diameter microchannels with 7.5 μm wide interconnected reentrant cavities at 47 kPa exit pressure has been investigated. Average two-phase heat transfer coefficients have been obtained over effective heat fluxes ranging from 28 to 445 W/cm2 and mass fluxes from 41 to 302 kg/m2 s. A map is developed that divides the data into two regions where the heat transfer mechanisms are nucleation or convective boiling dominant. The map is compared to similar atmospheric exit pressure data developed in a previous study. A boiling mechanism transition criterion based on the Reynolds number and the Kandlikar k1 number is proposed.

Copyright © 2005 by ASME

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