The Proceedings of the International Conference on Nuclear Engineering (ICONE)
Online ISSN : 2424-2934
2019.27
Session ID : 1988
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THE STUDY OF CHF MECHANISM MODEL IN UPFLOW BOILING VERTICAL ROUND TUBE UNDER HIGH PRESSURE
*Wei LiuShinian PengGuangming JiangYu LiuJianqiang Shan
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Abstract

The CHF prediction under high pressure condition, even close to the vicinity of the critical point of water, is an important issue. Although there are many empirical CHF correlations, most of them have covered the pressure under 15MPa. In this study, according to the characteristics of DNB type CHF under high pressure condition, the constitutive correlations of the Weisman & Pei model are proposed. The prediction results of three entrainment and deposition correlations of Kataoka, Celata and Hewitt corresponding to the Dry-out (DO) type CHF are analyzed. Based on the two improved models above, a comprehensive CHF mechanism model under high pressure condition combined the DNB and DO type boiling crisis is established. The verification based on the experiment database of upflow boiling in vertical round tube and the parametric trends analysis of CHF with thermal-hydraulic and geometric parameters are carried out. Findings of this study have a positive effect on further development of CHF prediction method for universal CHF mechanism, especially under high pressure region.

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© 2019 The Japan Society of Mechanical Engineers
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