Visualization of the subcooled flow boiling of R-134a in a vertical rectangular channel with an electrically heated wall

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A digital photographic study of subcooled flow boiling with R-134a was performed in a vertical rectangular channel heated from one side to observe near-wall structures. Primary attention was given to bubble formation and bubble coalescence in the bubble layer. The visualization made possible a detailed observation of the characteristic near-wall region, consisting of vapor remnants, an interleaved liquid layer, and coalesced adjacent bubbles. In particular, the visualization provided clearer insights about bubble coalescence behaviors during flow nucleate boiling. In addition, it is shown that the near-wall bubble layer of nucleate boiling beneath vapor clots is extinguished and, afterwards, the heated surface is locally covered by large vapor films, at CHF. (C) 2004 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2004-09
Language
English
Article Type
Article
Keywords

FLUX; MODEL; PREDICTION; BUBBLES

Citation

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.47, no.19-20, pp.4349 - 4363

ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2004.04.030
URI
http://hdl.handle.net/10203/3365
Appears in Collection
NE-Journal Papers(저널논문)
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