冷却管内气液界面流动特性数值模拟研究

Numerical Simulation of Gas-liquid Interface Flow Characferistics in Scrubbing-cooling Pipe

采用数值模拟的方法,并应用VOF多相流模型,对管内液膜的速度分布特性、管内动压力分布特性进行了分析,探讨了气液两相速度差与气液两相湍动能大小的关系及不同液膜入口厚度下的液膜流型。结果表明:液膜平均速度在轴向位置先增大,后趋于稳定;液体入口流量对液膜轴向速度分布影响显著;液膜沿管径方向速度梯度较大;管内动压力受液体入口速度的影响明显;气液两相速度差越大,湍动能越大;液膜入口厚度越厚,液膜越稳定。

The distribution of the liquid film velocity and the dynamic pressure in the vertical pipe was simula- ted by using VOF muhiphase flow model. The relationship between the velocity of gas-liquid two-phase and tur- bulent kinetic energy was discussed in the same method. Flow pattern under different inlet thickness of liquid film was discussed on the same time. The results showed that ： average speed of the liquid film was increased in axial position and then stabilized;Axial velocity distribution was influenced significantly by liquid inlet flux; Liquid film velocity gradient along the direction of the diameter was larger; Dynamic pressure in the vertical pipe was influenced by liquid inlet velocity obvious;when the different value of gas-liquid two-phase velocity was bigger, the turbulent kinetic energy was larger. The thicker of the liquid film inlet thickness, the more stable of the liquid film.