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An Analysis of Saturated Critical Heat Flux in Micro/Mini-Channels

[+] Author Affiliations
Zan Wu, Wei Li, Zhike Wang

Zhejiang University, Hangzhou, Zhejiang, China

Paper No. FEDSM-ICNMM2010-30603, pp. 137-146; 10 pages
doi:10.1115/FEDSM-ICNMM2010-30603
From:
  • ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting
  • ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B
  • Montreal, Quebec, Canada, August 1–5, 2010
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5450-1 | eISBN: 978-0-7918-3880-8
  • Copyright © 2010 by ASME

abstract

This paper verified the macro-to-micro-scale transitional criterion BoRel0.5 = 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 BoRel0.5 ≤ 200 and BoRel0.5 > 200 show very different trends for the entire database (1,672 data points). For the 859 data points with BoRel0.5 ≤ 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 Lh /dhe ≤ 150 and BoRel0.5 ≤ 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 WemCal0.8 was introduced to correlate the micro/mini-channel database for the region: Lh /dhe > 150 and BoRel0.5 ≤ 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.

Copyright © 2010 by ASME

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