倾斜管中低温气液两相流弹状气泡生成位置的实验研究

为研究倾斜管内低温气液两相流中弹状气泡初始生成位置的分布规律,采用高速相机对以液氮为工质的6种竖直倾角和4种内径下的管内弹状流进行了可视化实验,并对管路漏热进行了详细考察.实验结果表明,弹状气泡平均初始生成位置随管径的增大而增大,随倾角的增大先增大后减小;弹状气泡初始生成位置分布的离散程度随倾角增大而增大,在倾角为20°~45°时达到最大值,之后,其分布变为集中;竖直管路内弹状气泡初始生成位置离散程度随管径增加而减小.

Experimental Study on Initial Position of Taylor Bubbles of Cryogenic Two-Phase Slug Flow in Inclined Pipes

An experiment was carried out to study the characters of cryogenic gas-liquid flow with the working substance being nitrogen by high speed camera.It focused on the effects of inclination angle and diameter of pipe on the initial position distribution of Taylor bubbles.The range of inclination angles is 0°~60° from the vertical,and pipes in the experiment are 14 mm,18 mm,25 mm,32 mm in inner diameter.After a detailed study of heat leakage of pipes,the experimental results show that the average initial position of Taylor bubbles increases with the diameter increases,and with the inclination angle of the pipe increases,the average initial position increases first and then decreases.Dispersion of initial position of Taylor bubbles becomes larger with inclination angle of the pipe increases,with the maximum when the inclination angle ranges from 20° to 45°,then gets centralized,besides,it gets smaller with the diameter increases in vertical pipes.