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

作　　者：Lei Wu Hai-Jun Jia Xi-Zhen Ma Yang Liu Xing-Tuan Yang Jun Wang 

机构地区：[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 [2]Engineering Physics Institute,University of Wisconsin Madison

出　　处：《Nuclear Science and Techniques》2017年第6期169-178,共10页核技术（英文）

基　　金：supported by Doctoral Fund of Ministry of Education of China(No.20130002120016);the Science Found for Creative Groups of National Natural Science Foundation of China(No.51321002);the project of "Research and validation of key technology and device for NHR200-Ⅱ nuclear heating reactor"

摘　　要：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 Re_(mass) and Re_(energy),the general expressions for Re_(mass) and Re_(energy) and the relation between the corresponding heat transfer coefficients are obtained.In the laminar and wavefree flow regime,Re_(mass) and Re_(energy) are equivalent,while in the laminar and wavy flow regime,Re_(mass) is much smaller than Re_(energy),and the deviation of the corresponding average heat transfer coefficients is about 30% at the maximum.In the turbulent flow regime,the relation of Re_(mass) and Re_(energy)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 Re_(energy) is more accurate.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 Re _mass and Re _energy, the general expressions for Re _mass and Re _energy and the relation between the corresponding heat transfer coefficients are obtained. In the laminar and wave-free flow regime, Re _mass and Re _energy are equivalent, while in the laminar and wavy flow regime, Re _mass is much smaller than Re _energy, and the deviation of the corresponding average heat transfer coefficients is about 30% at the maximum. In the turbulent flow regime, the relation of Re _mass and Re _energy 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 Re _energy is more accurate.

关 键 词：Film CONDENSATION REYNOLDS CORRELATION Heat transfer COEFFICIENT Natural CONVECTION 

分 类 号：TL331[核科学技术—核技术及应用]