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Hysteresis Phenomena at the Onset of Subcooled Nucleate Flow Boiling in Microchannels

[+] Author Affiliations
Magdalena Piasecka, Mieczyslaw E. Poniewski

Kielce University of Technology, Kielce, Poland

Paper No. ICMM2003-1071, pp. 581-588; 8 pages
doi:10.1115/ICMM2003-1071
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

In this paper, attempts were made to experimentally investigate the boiling incipience in a narrow rectangular vertical channel of 1 mm depth with an external 40 mm wide wall heated uniformly and others assumed quasiadiabatic. The “boiling front” location was determined from the temperature distribution of the heated wall obtained from liquid crystal thermography. Boiling incipience occurs when considerable rise in wall temperature above the saturation temperature takes place. Thus, boiling incipience is accompanied by “nucleation hysteresis”. The impact of various factors on the boiling incipience in microchannels, such as: pressure, the inlet liquid subcooling and flow velocity were investigated.

Copyright © 2003 by ASME

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