化工学报2011,Vol.62Issue(5):1239-1245,7.DOI:10.3969/j.issn.0438-1157.2011.05.009
附加惯性力作用下竖直矩形流道内过冷流动沸腾的数值模拟
Numerical simulation of subcooled flow boiling in vertical rectangular channel under additional inertial forces
摘要
Abstract
The additional inertial forces caused by rolling conditions would affect the two-phase flow pressure drop and the forces acting on the bubbles. Numerical simulation of subcooled flow boiling in a vertical rectangular channel under the effect of additional inertial forces has been carried out considering the energy and mass transfer during phase change. The two-phase flow model of volume-of-fluid (VOF) was adopted. The liquid-vapor interface was captured using the piecewise linearity interpolation calculation (PLIC) geometry restructuring method. The pressure, velocity, temperature distribution around an isolated bubble, the secondary flow phenomenon caused by evaporation and condensation, and the evolution of velocity vector during bubble coalescence were obtained, which agree well with the results in literature. Compared with motion less conditions, the pressure drop was enlarged by the effect of additional inertial forces. In subcooled flow boiling, the pressure drop fluctuates because of the vapor generation. The fluctuation becomes more severe while heat flux increases. Compared with the effects of other forces acting on bubbles, the effect of additional inertial forces can be neglected. However, the fluctuation of flow rate caused by rolling would change the shear lift force, drag force and hydrodynamic pressure force significantly and influence the heat transfer in boiling flow.关键词
数值模拟/附加惯性力/过冷流动沸腾/汽泡动力学/VOFKey words
numerical simulation/ additional inertial forces/ subcooled flow boiling/ bubble dynamics/ VOF分类
能源科技引用本文复制引用
魏敬华,潘良明,徐建军,黄彦平..附加惯性力作用下竖直矩形流道内过冷流动沸腾的数值模拟[J].化工学报,2011,62(5):1239-1245,7.基金项目
国家自然科学基金项目(50406012) (50406012)
中国核动力研究设计院空泡物理和自然循环重点实验室资助项目. ()