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Bang, In Cheol
Nuclear Thermal-Hydraulics & Reactor Safety Lab
Research Interests
  • Nuclear Thermal-Hydraulics
  • Nuclear Safety
  • Nuclear System Design & Analysis
  • Nanofluids
  • Critical Heat Flux

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A photographic study on the near-wall bubble behavior in subcooled flow boiling

Cited 16 times inthomson ciCited 19 times inthomson ci
Title
A photographic study on the near-wall bubble behavior in subcooled flow boiling
Author
Chang, SHBang, In CheolBaek, WP
Issue Date
2002-07
Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
Citation
INTERNATIONAL JOURNAL OF THERMAL SCIENCES, v.41, no.7, pp.609 - 618
Abstract
The behavior of near-wall bubbles in subcooled flow boiling has been investigated photographically for water flow in vertical, one-side heated, rectangular channels at mass fluxes of 500, 1500, 2000 kg·m-2·s-1 under atmospheric pressure. Primary attention was given to the bubble coalescence phenomenon and the structure of the near-wall bubble layer. The number of near-wall bubbles increased with the increase in the heat flux. At sufficiently high heat fluxes (>60-70% CHF), three characteristic layers were observed in the heated channel: (a) a superheated liquid layer with small bubbles attached on the heated wall, (b) a flowing bubble layer consisting of large coalesced bubbles over the superheated liquid layer, and (c) the liquid core over the flowing bubble layer. In addition, the existence of a liquid sublayer under coalesced bubbles was identified photographically. According to visualization, the CHF mechanism for the present experimental condition could be related to the formation of large vapor clots resulting from coalescences of bubbles and the evaporation of the superheated liquid layer beneath those clots.
URI
https://scholarworks.unist.ac.kr/handle/201301/7288
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0036080120
DOI
10.1016/S1290-0729(02)01354-6
ISSN
1290-0729
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