关键词 : 气泡脱离直径 ;过冷沸腾 ;空泡份额 ;数值模拟中图分类号 : TL333 　 文献标志码 : A 　 文章编号 : 0253Ο987X(2008) 07Ο0855Ο05Numerical Simulation of Subcooled Boiling Water in VerticalConcentric Annulus under Low PressureCHEN Erfeng , L I Yanzhong , WAN G Simin(School of Energy and Power Engineering , Xi′an Jiaotong University , Xi′an 710049 , China)Abstract : Adopted a modified bubble departure diameter correlation based on the Unal mecha2nism model , a numerical simulation of subcooled boiling water under low pressure was performedon the computational fluid dynamics code CFX51 7 with user defined FORTRAN program. Thewater boiling flow experiments under low pressure in a vertical concentric annulus from referencewere adopted to validate the modified model of bubble departure diameter. Moreover , the exami2nation of grid independence was discussed , and the influences of the non2drag force on the radialvoid fraction distribution force were investigated , including lift force , turbulent dispersion forceand wall lubrica