窄流道内弹状流和液膜特性的数值模拟  

Numerical Simulation of Gas-Liquid Slug Flow inside Narrow Channels

作　　者：张文志[1] 潘良明[1] 徐建军[2] 黄彦平[2] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,成都610041

出　　处：《核动力工程》2011年第6期81-85,共5页Nuclear Power Engineering

基　　金：中央高校基本科研业务费资助重点项目(CDJZR10145501)

摘　　要：基于流体体积函数(VOF)模型,对矩形窄流道中不同液相流速下泰勒气泡及周围流场特性进行分析。结果表明,无量纲气泡速度随毛细力数(Ca)变化关系与垂直方形流道实验结果符合较好。壁面切应力在气泡长度方向上不断变大,直到进入尾流区,产生强烈的无规则变化。随着液体质量流速的增大,泰勒气泡变得更尖锐,液膜厚度变厚,但壁面切应力和液膜轴向速度减小,从而出现液膜中下降液膜比例减小。Based on VOF model,the Taylor bubble and its surrounding characteristics of flow field are analyzed in a vertical rectangular narrow channel at different liquid flow rate.It shows that the relationship between the dimensionless bubble velocity and capillary number agrees well with those experimental results in cubic channels reported in literature The wall stress distribution around a gas slug has been investigated and the results show that the wall stress increases from the bubble nose to tail,but severe random motion would be occurred at the region behind the bubble tail.Meanwhile,as liquid flow rate increases,the Taylor bubble shape becomes much sharper and the liquid film thickness becomes thicker gradually,however,both the wall stress and the liquid axial velocity decrease and thus the portion of downward flow becomes shorter.

关 键 词：泰勒气泡 壁面切应力 液膜 VOF模型 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TL331[动力工程及工程热物理—热能工程]