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Preliminary Consideration to Avoid Eruptive Flow Boiling in Microchannels

[+] Author Affiliations
Dong Woon Jeong, Kwang Uoong Koh, Sang Yong Lee

Korea Advanced Institute of Science and Technology, Daejeon, Korea

Paper No. ICMM2003-1076, pp. 609-614; 6 pages
doi:10.1115/ICMM2003-1076
From:
  • ASME 2003 1st International Conference on Microchannels and Minichannels
  • 1st International Conference on Microchannels and Minichannels
  • Rochester, New York, USA, April 24–25, 2003
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-3667-3
  • Copyright © 2003 by ASME

abstract

With boiling flows in very smooth heated channels, in general, the bulk liquid is superheated before the bubble formation takes place at the wall surface. Thus the eruptive boiling occurs once the superheat requirement for nucleation is satisfied, and this can be a source of flow instability. In the present work, a preliminary consideration has been given to predict the limiting heat flux for stable boiling in microchannels. The minimum heat-flux value to avoid this eruptive boiling is inversely proportional to the square of the channel diameter, and becomes enormously large as the channel diameter decreases. The stable heat-flux limit also depends on the cavity size in the channel wall. A map showing stable nucleation criteria was given and discussions were made on the simplifying assumptions made for the analysis.

Copyright © 2003 by ASME

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