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Evaporation in Microchannels: Influence of the Channel Diameter on Heat Transfer

[+] Author Affiliations
V. Dupont, J. R. Thome

Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland

Paper No. ICMM2004-2369, pp. 461-468; 8 pages
doi:10.1115/ICMM2004-2369
From:
  • ASME 2004 2nd International Conference on Microchannels and Minichannels
  • ASME 2nd International Conference on Microchannels and Minichannels
  • Rochester, New York, USA, June 17–19, 2004
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4164-2
  • Copyright © 2004 by ASME

abstract

This paper discusses the effect of diameter on both flow boiling heat transfer and transition from macro to microchannel evaporation. A recently proposed three-zone flow boiling model based on evaporation of elongated bubbles in microchannels is briefly described and used for the present analysis. In the microscale range, the model predicts an increase in the two-phase heat transfer coefficient with a decrease of d for low values of the vapor quality and a decrease of h for larger values of x. This behavior is explained by the influence of the liquid film thickness, deposited periodically behind passing liquid slugs.

Copyright © 2004 by ASME

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