黏性段塞稳定模型预测水平气液两相流流型转变

Prediction of horizontal gas-liquid flow regime transition based on viscous slug stability model

在内径50.4 mm水平管道上进行气液两相流实验,实验介质是2种不同黏度的油,根据两相表观速度绘制流型图。使用段塞稳定性模型预测段塞流的转变边界。由于黏度增加阻碍大振幅波和滚动波的起波和波增,黏度大的液体出现段塞的临界液层高度高于黏度小的液体。段塞稳定性模型低估了大黏度液体的临界液层高度和临界表观速度。考虑液体黏性对段塞体内部湍流扰动的抑制作用以及气液表面张力的影响,修正了Benjamin泡移动速度关系式。修正后的段塞稳定性模型对中、低黏度液体适应性较好,预测出现段塞流的临界条件和实验数据比较吻合。

The experiment of air-oil flow pattern was carried out in a horizontal pipeline with ID 50.4 mm, by using two liquids of different viscosities as working media. Flow regime graphs were presented, and the slug stability model was used to predict the transition of slug flow. The critical height of liquid layer for the onset of slug flow with higher viscosity was larger than that with lower viscosity since viscosity restrained the emergence and development of large amplitude waves and roll waves. The slug stability model underestimated the critical height of liquid layer and the critical superficial velocities. The empirical relationship, which included gas-liquid surface tension and the viscous restraint to turbulent disturbance in slug unit, was introduced to calculate Benjamin bubble velocity. The revised model, suitable for the liquid with medium or low viscosity, was validated by comparing the critical parameters with the corresponding data available in current experiment, showing satisfactory results over the concerned flow ranges.