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Local heat transfer in subcooled flow boiling in a vertical mini-gap channel

Li, Wei; Li, Junye; Feng, Zhaozan; Zhou, Kan and Wu, Zan LU (2017) In International Journal of Heat and Mass Transfer 110. p.796-804
Abstract

An experimental study of subcooled flow boiling in a high-aspect-ratio, one-sided heating rectangular mini-gap channel was conducted using deionized water. The local heat transfer coefficient, onset of nucleate boiling (ONB), and flow pattern of subcooled boiling were investigated. The influence of heat flux and mass flux were studied with the aid of a high-speed camera. The bubbles were generated more quickly at higher heat flux and the diameters of departing bubbles decreased with increased flow mass flux. Partial dry-out and rewetting process caused by elongated bubble was also observed at lower mass flux. With the increase of heat flux, the surface near exit started boiling firstly, with more sharply increased heat transfer... (More)

An experimental study of subcooled flow boiling in a high-aspect-ratio, one-sided heating rectangular mini-gap channel was conducted using deionized water. The local heat transfer coefficient, onset of nucleate boiling (ONB), and flow pattern of subcooled boiling were investigated. The influence of heat flux and mass flux were studied with the aid of a high-speed camera. The bubbles were generated more quickly at higher heat flux and the diameters of departing bubbles decreased with increased flow mass flux. Partial dry-out and rewetting process caused by elongated bubble was also observed at lower mass flux. With the increase of heat flux, the surface near exit started boiling firstly, with more sharply increased heat transfer coefficient compared to the surface near entrance. The experimental heat transfer coefficients were analyzed using four existing correlations. The four correlations are all in an error band of −20% to +25%, and Chen correlation tends to have better performance at higher heat transfer coefficient.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Heat transfer, Mini-gap channel, Onset of nucleate boiling, Subcooled flow boiling
in
International Journal of Heat and Mass Transfer
volume
110
pages
9 pages
publisher
Pergamon
external identifiers
  • scopus:85016390878
  • wos:000401399000073
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2017.03.086
language
English
LU publication?
yes
id
4b970666-5bea-4edf-933a-282e0052039e
date added to LUP
2017-04-11 09:42:32
date last changed
2018-01-14 04:31:35
@article{4b970666-5bea-4edf-933a-282e0052039e,
  abstract     = {<p>An experimental study of subcooled flow boiling in a high-aspect-ratio, one-sided heating rectangular mini-gap channel was conducted using deionized water. The local heat transfer coefficient, onset of nucleate boiling (ONB), and flow pattern of subcooled boiling were investigated. The influence of heat flux and mass flux were studied with the aid of a high-speed camera. The bubbles were generated more quickly at higher heat flux and the diameters of departing bubbles decreased with increased flow mass flux. Partial dry-out and rewetting process caused by elongated bubble was also observed at lower mass flux. With the increase of heat flux, the surface near exit started boiling firstly, with more sharply increased heat transfer coefficient compared to the surface near entrance. The experimental heat transfer coefficients were analyzed using four existing correlations. The four correlations are all in an error band of −20% to +25%, and Chen correlation tends to have better performance at higher heat transfer coefficient.</p>},
  author       = {Li, Wei and Li, Junye and Feng, Zhaozan and Zhou, Kan and Wu, Zan},
  issn         = {0017-9310},
  keyword      = {Heat transfer,Mini-gap channel,Onset of nucleate boiling,Subcooled flow boiling},
  language     = {eng},
  month        = {07},
  pages        = {796--804},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Local heat transfer in subcooled flow boiling in a vertical mini-gap channel},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.03.086},
  volume       = {110},
  year         = {2017},
}