Numerical Simulation Research of Subcooled Boiling Water in Vertical Concentric Annulus Pipe under Low Pressure

A numerical simulation of subcooled boiling in annulus pipe in low pressure conditions was performed on Computational Fluid Dynamics code CFX with user defined program. LEE’s subcooled boiling experiment results in 2002 and 2008 were used for calculations. Bubble departure diameter was used Tolubimsky modified correlation based on Unal bubble departure diameter model and bubble average diameter correlation was used Anglart correlation. The influences of different lift force models and turbulent dispersion force models in non drag models on the radial void fraction distribution were compared; a model use suggestion was given. Compared the calculation results and experiment, the simulation results indicate that the models are endowed with a preferable applicability in low pressure conditions