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Heat transfer correlations for elongated bubbly flow in flow boiling micro/minichannels

Wu, Zan LU and Sundén, Bengt LU (2016) In Heat Transfer Engineering p.985-993
Abstract
An improved conventional-to-micro/minichannel criterion was proposed by using the Bond number and the liquid Reynolds number. In micro/minichannels, bubbles tend to be confined and elongated in the channel and the conventional two-phase flow theory loses its applicability. As significant disagreement in experimental trends and heat transfer mechanisms was reported for flow boiling in micro/minichannels in the literature, it is not possible to explain the discrepancy and predict all data points by a single correlation without considering the different flow patterns. In this study, heat transfer correlations for elongated bubbly flow in flow boiling micro/minichannels were developed based on a collected micro/minichannel heat transfer... (More)
An improved conventional-to-micro/minichannel criterion was proposed by using the Bond number and the liquid Reynolds number. In micro/minichannels, bubbles tend to be confined and elongated in the channel and the conventional two-phase flow theory loses its applicability. As significant disagreement in experimental trends and heat transfer mechanisms was reported for flow boiling in micro/minichannels in the literature, it is not possible to explain the discrepancy and predict all data points by a single correlation without considering the different flow patterns. In this study, heat transfer correlations for elongated bubbly flow in flow boiling micro/minichannels were developed based on a collected micro/minichannel heat transfer database. The newly developed correlations not only can present a decent overall accuracy, but also estimate the parametric trends correctly. More than 97% of the data points can be predicted by the proposed correlations within a ±50% error band for elongated bubbly flow. Also, a flow-pattern-based model can be developed by combining the developed elongated bubbly flow correlations with previous annular flow correlations for predicting flow boiling heat transfer in micro/minichannels. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Heat Transfer Engineering
pages
985 - 993
publisher
Taylor & Francis
external identifiers
  • scopus:84958180338
  • wos:000370967300009
ISSN
1521-0537
DOI
10.1080/01457632.2015.1098269
language
English
LU publication?
yes
id
43f88fb3-512c-4a2b-b7c5-e4649dc000f5 (old id 5424898)
date added to LUP
2015-08-21 13:32:07
date last changed
2017-01-01 07:34:28
@article{43f88fb3-512c-4a2b-b7c5-e4649dc000f5,
  abstract     = {An improved conventional-to-micro/minichannel criterion was proposed by using the Bond number and the liquid Reynolds number. In micro/minichannels, bubbles tend to be confined and elongated in the channel and the conventional two-phase flow theory loses its applicability. As significant disagreement in experimental trends and heat transfer mechanisms was reported for flow boiling in micro/minichannels in the literature, it is not possible to explain the discrepancy and predict all data points by a single correlation without considering the different flow patterns. In this study, heat transfer correlations for elongated bubbly flow in flow boiling micro/minichannels were developed based on a collected micro/minichannel heat transfer database. The newly developed correlations not only can present a decent overall accuracy, but also estimate the parametric trends correctly. More than 97% of the data points can be predicted by the proposed correlations within a ±50% error band for elongated bubbly flow. Also, a flow-pattern-based model can be developed by combining the developed elongated bubbly flow correlations with previous annular flow correlations for predicting flow boiling heat transfer in micro/minichannels.},
  author       = {Wu, Zan and Sundén, Bengt},
  issn         = {1521-0537},
  language     = {eng},
  pages        = {985--993},
  publisher    = {Taylor & Francis},
  series       = {Heat Transfer Engineering},
  title        = {Heat transfer correlations for elongated bubbly flow in flow boiling micro/minichannels},
  url          = {http://dx.doi.org/10.1080/01457632.2015.1098269},
  year         = {2016},
}