Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (6): 85 doi: 10.1007/s41365-017-0240-9

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Research on the effect of Reynolds correlation in natural convection film condensation

Lei Wu1, Hai-Jun Jia1, Xi-Zhen Ma1, Yang Liu1, Xing-Tuan Yang1, Jun Wang2   

  1. 1 Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor
    Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China
    2 Engineering Physics Institute, University of Wisconsin Madison, Madison, WI 53706, USA
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Lei Wu, Hai-Jun Jia, Xi-Zhen Ma, Yang Liu, Xing-Tuan Yang, Jun Wang. Research on the effect of Reynolds correlation in natural convection film condensation.Nuclear Science and Techniques, 2017, 28(6): 85     doi: 10.1007/s41365-017-0240-9

Abstract:

Film condensation is a vital phenomenon in the nuclear engineering applications, such as the gas–steam pressurizer design, and heat removing on containment in the case of postulated accident. Reynolds number in film condensation can be calculated from either the mass relation or the energy relation, but few researches have distinguished the difference between them at present. This paper studies the effect of Reynolds correlation in the natural convection film condensation on the outer tube. The general forms of the heat transfer coefficient correlation of film condensation are developed in different flow regimes. By simultaneously solving a set of the heat transfer coefficient correlations with Remass and Reenergy, the general expressions for Remass and Reenergy and the relation between the corresponding heat transfer coefficients are obtained. In the laminar and wavefree flow regime, Remass and Reenergy are equivalent, while in the laminar and wavy flow regime, Remass is much smaller than Reenergy, and the deviation of the corresponding average heat transfer coefficients is about 30% at the maximum. In the turbulent flow regime, the relation of Remass and Reenergy is greatly influenced by Prandtl number. The relative deviation of their average heat transfer coefficients is the nonlinear function of Reynolds number and Prandtl number. Compared with experimental results, the heat transfer coefficient calculated from Reenergy is more accurate.

Key words: Film condensation, Reynolds correlation, Heat transfer coefficient, Natural convection