倾斜管内低温两相弹状流特性实验研究——弹状汽泡运动速度

使用高速动态分析仪对低温倾斜上升管内不同位置处弹状汽泡进行了可视化实验研究。对获得的弹状汽泡的运动速度进行了统计分析,研究了弹状汽泡运动速度的变化规律。结果表明:对于两个不同管径的管路,当倾斜角θ(相对水平方向的夹角)为90,°80,°70°时,弹状汽泡上升速度随着长径比(x/D)的增大而增大,与传统的空气-水两相弹状汽泡沿着管路的运动速度的变化趋势不同;当倾斜角60°时,弹状汽泡上升速度随着x/D的增大先增大后减小;当倾斜角θ为45,°40°时,弹状汽泡上升速度随着x/D的增大而减小;所有工况下,随着倾斜角度的减小,弹状汽泡上升速度先增大后减小,在θ=60°处最大,且在管出口处,汽泡的上升速度几乎不变。该文为进一步研究低温液氮沸腾两相弹状流发展过程中弹状汽泡运动速度提供参考依据。

Experimental study on the cryogenic two-phase slug flow characteristic in inclined pipes-Taylor bubble rising velocity

The velocity of the Taylor bubble has been experimental studied in different axial position of upward inclined pipe by using high speed motion analyzer. Statistical method was employed to analyze the data of the Taylor bubble velocity. The results showed that the velocity of the Taylor bubble was increasing with x/D at 90°,80°,70°angles for two pipes and are contrary to the air-water slug flow. At 60° angle, the velocities of the Taylor bubble increased first, and then decreased with increasing x/D. At 45°,40°angles, the velocities of the Taylor bubble decreased with increasing x/D. For all cases, the velocities of the Taylor bubble increased first, and then decreased with decreased angles and were almost constant at the exit of pipes. These conclusions provide a basis for further study of the velocity of the Taylor bubble for the undeveloped liquid nitrogen boiling slug flow.