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An analysis of saturated critical heat flux in micro/mini-channels

Wu, Zan LU ; Li, Wei LU and Wang, Zhike (2010) ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2010 Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting p.137-146
Abstract

This paper verified the macro-to-micro-scale transitional criterion BoRel 0.5 = 200 proposed by Li and Wu [W. Li, Z. Wu, A general criterion for evaporative heat transfer in micro/minichannels, International Journal of Heat and Mass Transfer 53 (2010) 1967-1976] because data points where BoRel 0.5 ≤ 200 and BoRel
0.5 > 200 show very different trends for the entire database (1,672 data points). For the 859 data points with BoRel
0.5 ≤ 200, the boiling number at CHF decreases greatly with length-to-diameter ratio Lh/dhe when Lh/dhe is small, while Lh/dhe presents negligible effect on the boiling... (More)

This paper verified the macro-to-micro-scale transitional criterion BoRel 0.5 = 200 proposed by Li and Wu [W. Li, Z. Wu, A general criterion for evaporative heat transfer in micro/minichannels, International Journal of Heat and Mass Transfer 53 (2010) 1967-1976] because data points where BoRel 0.5 ≤ 200 and BoRel
0.5 > 200 show very different trends for the entire database (1,672 data points). For the 859 data points with BoRel
0.5 ≤ 200, the boiling number at CHF decreases greatly with length-to-diameter ratio Lh/dhe when Lh/dhe is small, while Lh/dhe presents negligible effect on the boiling number when Lh/dhe < 150. For the region where L h/dhe ≤ 150 and BoRel
0.5 ≤ 200, a simple saturated CHF correlation was proposed by using the boiling number, length-to-diameter ratio, and exit quality. Heated length and heated equivalent diameter were adopted in the length-to-diameter ratio, considering the actual heat transfer conditions. A combined dimensionless number We mCal
0.8was introduced to correlate the micro/mini-channel database for the region: Lh/dhe > 150 and BoRel
0.5 ≤ 200. The new method can predict the overall micro/mini-channel database accurately on the whole. It can predict almost 95.5% of the non-aqueous data and 93.5% of the water data within the ± 30% error band.

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Please use this url to cite or link to this publication:
author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Boiling number, Capillary number, Length-to-diameter ratio, Microchannel, Saturated critical heat flux (CHF), Weber number
host publication
ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010
article number
FEDSM-ICNMM2010-30603
edition
PARTS A AND B
pages
10 pages
conference name
ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2010 Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting
conference location
Montreal, QC, Canada
conference dates
2010-08-01 - 2010-08-05
external identifiers
  • scopus:84862931832
ISBN
978-0-7918-3880-8
9780791854501
DOI
10.1115/FEDSM-ICNMM2010-30603
language
English
LU publication?
no
id
c3b2e7a6-0cb2-41dc-a89a-c478604bbb31
date added to LUP
2018-11-01 09:27:12
date last changed
2020-01-13 01:07:27
@inproceedings{c3b2e7a6-0cb2-41dc-a89a-c478604bbb31,
  abstract     = {<p>This paper verified the macro-to-micro-scale transitional criterion BoRel 0.5 = 200 proposed by Li and Wu [W. Li, Z. Wu, A general criterion for evaporative heat transfer in micro/minichannels, International Journal of Heat and Mass Transfer 53 (2010) 1967-1976] because data points where BoRel <sup>0.5</sup> ≤ 200 and BoRe<sub>l</sub><br>
                            <sup>0.5</sup> &gt; 200 show very different trends for the entire database (1,672 data points). For the 859 data points with BoRe<sub>l</sub><br>
                            <sup>0.5</sup> ≤ 200, the boiling number at CHF decreases greatly with length-to-diameter ratio Lh/dhe when Lh/dhe is small, while L<sub>h</sub>/d<sub>he</sub> presents negligible effect on the boiling number when L<sub>h</sub>/d<sub>he</sub> &lt; 150. For the region where L <sub>h</sub>/d<sub>he</sub> ≤ 150 and BoRe<sub>l</sub><br>
                            <sup>0.5</sup> ≤ 200, a simple saturated CHF correlation was proposed by using the boiling number, length-to-diameter ratio, and exit quality. Heated length and heated equivalent diameter were adopted in the length-to-diameter ratio, considering the actual heat transfer conditions. A combined dimensionless number We <sub>m</sub>Ca<sub>l</sub><br>
                            <sup>0.8</sup>was introduced to correlate the micro/mini-channel database for the region: L<sub>h</sub>/d<sub>he</sub> &gt; 150 and BoRe<sub>l</sub><br>
                            <sup>0.5</sup> ≤ 200. The new method can predict the overall micro/mini-channel database accurately on the whole. It can predict almost 95.5% of the non-aqueous data and 93.5% of the water data within the ± 30% error band.</p>},
  author       = {Wu, Zan and Li, Wei and Wang, Zhike},
  booktitle    = {ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010},
  isbn         = { 978-0-7918-3880-8},
  language     = {eng},
  month        = {12},
  pages        = {137--146},
  title        = {An analysis of saturated critical heat flux in micro/mini-channels},
  url          = {http://dx.doi.org/10.1115/FEDSM-ICNMM2010-30603},
  doi          = {10.1115/FEDSM-ICNMM2010-30603},
  year         = {2010},
}