垂直上升弹状流中弹状氢气泡运动速度

Rising velocity of Taylor hydrogen bubble in upward vertical slug flow

针对垂直管路内气液两相流实验化困难的问题,运用建模仿真的方法建立了竖直管路中弹状流气泡的运动模型,模拟了弹状氢气泡在垂直管路的上升过程,并对其运动速度进行了研究.仿真结果表明:在静置的竖直管道内,充分发展的弹状氢气泡的速度基本上以0.226 5m/s的速度匀速上升;弹状氢气泡在流动液氢中运动时,其速度模型中的速度系数与流体的速度有关,当雷诺数从220上升到6400时,其系数的值从1.83下降到1.14;在未充分发展的弹状流系统中,气泡间距对气泡速度分布有着影响,其上升速度随着气泡间距的减小而增大.

Aiming at the difficulties of gas-liquid flow experiment in the vertical pipe, the modeling and simulation methods were conducted to investigate the dynamic model of slug flow and the rising velocity of Taylor hydrogen bubble in upward vertical slug flow. Simulation results show that the velocity of the developed Taylor hydrogen bubble is 0. 2265 m · s-1. In flowing liquid, the velocity coefficient is insensitive to the liquid Reynolds num- ber. As the Reynolds number based on the liquid velocity, the Reynolds number increases from 220 to 6400, and the velocity coefficient decreases from 1.83 to 1.14. In developing Taylor bubble, the rising velocity increases with the shortening distance between consecu- tive bubbles.