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An improved liquid film model to predict the CHF based on the influence of churn flow
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2014 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 64, no 1-2, 422-429 p.Article in journal (Refereed) Published
Abstract [en]

The critical heat flux (CHF) for boiling crisis is one of the most important parameters in thermal management and safe operation of many engineering systems. Traditionally, the liquid film flow model for "dryout" mechanism shows a good prediction in heated annular two-phase flow. However, a general assumption that the initial entrained fraction at the onset of annular flow shows a lack of reasonable physical interpretation. Since the droplets have great momentum and the length of churn flow is short, the droplets in churn flow show an inevitable effect on the downstream annular flow. To address this, we considered the effect of churn flow and developed the original liquid film flow model in vertical upward flow by suggesting that calculation starts from the onset of churn flow rather than annular flow. The results indicated satisfactory predictions with the experimental data and the developed model provided a better understanding about the effect of flow pattern on the CHF prediction.

Place, publisher, year, edition, pages
2014. Vol. 64, no 1-2, 422-429 p.
Keyword [en]
Annular flow, CHF, Churn flow, Entrained fraction, Liquid film flow model
National Category
Other Physics Topics
URN: urn:nbn:se:kth:diva-142770DOI: 10.1016/j.applthermaleng.2013.12.064ISI: 000333777000044ScopusID: 2-s2.0-84892739556OAI: diva2:704470

QC 20140312

Available from: 2014-03-12 Created: 2014-03-12 Last updated: 2014-05-05Bibliographically approved

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Ma, Weimin
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Nuclear Power Safety
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