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Simple Flow-Pattern Based Heat Transfer Correlations for Flow Boiling in Micro/Minichannels

Wu, Zan LU ; Sundén, Bengt LU ; Yao, Shi-chune ; Wadekar, Vishwas V. and Li, Wei (2014) 12th International Conference on Nanochannels, Microchannels and Minichannels (ICNMM) p.001-04
Abstract
An improved conventional-to-micro/minichannel threshold was proposed as Bo = 4 and BoRe(1)(0.5) = 200, where Bo is the Bond number and Re-1 is the liquid Reynolds number. The region Bo < 4 and BoRe(1)(0.5) < 200 is termed as micro/minichannel because bubbles tend to be confined and elongated in the channel and the conventional two-phase flow theory loses its applicability. Flow-pattern based heat transfer correlations for elongated bubbly flow and annular flow in flow boiling micro/minichannels were developed separately based on a collected micro/minichannel heat-transfer database. As significant disagreement in experimental trends and heat transfer mechanisms was reported for flow boiling in micro/minichannels in the literature, it... (More)
An improved conventional-to-micro/minichannel threshold was proposed as Bo = 4 and BoRe(1)(0.5) = 200, where Bo is the Bond number and Re-1 is the liquid Reynolds number. The region Bo < 4 and BoRe(1)(0.5) < 200 is termed as micro/minichannel because bubbles tend to be confined and elongated in the channel and the conventional two-phase flow theory loses its applicability. Flow-pattern based heat transfer correlations for elongated bubbly flow and annular flow in flow boiling micro/minichannels were developed separately based on a collected micro/minichannel heat-transfer database. 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. The newly developed flow-pattern based predictive tool can not only present a decent overall accuracy, but also estimate the parametric trends correctly. Over 95% of the data points can be predicted by the proposed correlations within a +/- 50% error band for both elongated bubbly flow and annular flow. Therefore, the simple flow-pattern based correlations can be applied for heat exchanger design, improve understanding of the underlying heat transfer mechanisms, and guide development of further enhancement techniques for flow boiling in micro/minichannels. (Less)
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author
; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Proceedings of the Asme 12th International Conference on Nanochannels, Microchannels, and Minichannels, 2014
pages
001 - 04
publisher
Amer. Soc. Mechanical Engineers
conference name
12th International Conference on Nanochannels, Microchannels and Minichannels (ICNMM)
conference dates
2014-08-03 - 2014-08-07
external identifiers
  • wos:000360511900032
  • scopus:85043215193
DOI
10.1115/ICNMM2014-21025
language
English
LU publication?
yes
id
149d900d-3dc6-4663-9ff4-2db3461efd45 (old id 8080637)
date added to LUP
2016-04-04 10:54:33
date last changed
2022-01-29 21:03:54
@inproceedings{149d900d-3dc6-4663-9ff4-2db3461efd45,
  abstract     = {{An improved conventional-to-micro/minichannel threshold was proposed as Bo = 4 and BoRe(1)(0.5) = 200, where Bo is the Bond number and Re-1 is the liquid Reynolds number. The region Bo &lt; 4 and BoRe(1)(0.5) &lt; 200 is termed as micro/minichannel because bubbles tend to be confined and elongated in the channel and the conventional two-phase flow theory loses its applicability. Flow-pattern based heat transfer correlations for elongated bubbly flow and annular flow in flow boiling micro/minichannels were developed separately based on a collected micro/minichannel heat-transfer database. 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. The newly developed flow-pattern based predictive tool can not only present a decent overall accuracy, but also estimate the parametric trends correctly. Over 95% of the data points can be predicted by the proposed correlations within a +/- 50% error band for both elongated bubbly flow and annular flow. Therefore, the simple flow-pattern based correlations can be applied for heat exchanger design, improve understanding of the underlying heat transfer mechanisms, and guide development of further enhancement techniques for flow boiling in micro/minichannels.}},
  author       = {{Wu, Zan and Sundén, Bengt and Yao, Shi-chune and Wadekar, Vishwas V. and Li, Wei}},
  booktitle    = {{Proceedings of the Asme 12th International Conference on Nanochannels, Microchannels, and Minichannels, 2014}},
  language     = {{eng}},
  pages        = {{001--04}},
  publisher    = {{Amer. Soc. Mechanical Engineers}},
  title        = {{Simple Flow-Pattern Based Heat Transfer Correlations for Flow Boiling in Micro/Minichannels}},
  url          = {{http://dx.doi.org/10.1115/ICNMM2014-21025}},
  doi          = {{10.1115/ICNMM2014-21025}},
  year         = {{2014}},
}