Abstract: The coalescence process of Taylor bubbles in cryogenic slug flow was obtained by high speed camera in 16 mm inner diameter tube at the inclination angle from 30o to 90o. The results show that the existing equations of Taylor bubble coalescence for normal atmospheric temperature liquid have large discrepancy with the present experimental results. The maximum error is larger than 14.6%. Thus the new equations for Taylor bubble coalescence in cryogenic two-phase flow have been established, and the maximum error is reduced to 4.7%. The present study provides reference for installation of cryogenic tube.

Key words: cryogenic, gas-liquid two-phase flow, Taylor bubble, minimum stable distance, coalescence

摘要： 在自建的低温气液两相流实验平台的基础上，通过高速相机获得16 mm内径管路中30o~90o倾角下Taylor气泡之间的合并过程. 结果表明，已有的常温气液两相流中Taylor气泡的合并公式普遍高估了跟随气泡和领先气泡的速度比，与实验结果的最大误差为14.6%，对低温气液两相流不再适用. 新建的Taylor气泡合并过程速度拟合公式可将最大误差减小至4.7%. 此外，气泡间最小稳定距离在60o倾角附近最小，此时气泡间合并趋势最弱.

关键词: 低温, 气液两相流, Taylor气泡, 最小稳定距离, 合并