Abstract: Visualized experiments were conducted by using a high speed video camera system to study slug flow in a narrow rectangular channel(3.25 mm×40 mm)with four inclination angles.For low two-phase superficial velocity,due to buoyancy slug nose deviated from the channel centerline and became sharper under inclined condition,resulting in the increase of slug velocity.The coefficient C₀ decreased with increasing inclination angle,while drift velocity V₀ varied inversely.For the case of high two-phase superficial velocity,the influence of inclination angle on slug velocity weakened with the flow tending to be stable,as was the same to C₀ and V₀.Four classical correlations for calculating slug velocity were evaluated against the experimental data.The correlations of C₀ and V₀ were given according to the threshold of 3.5 of Froude number.

Key words: narrow rectangular channel, slug velocity, inclination, slug flow

摘要： 利用高速摄像系统,对4种倾角下窄矩形通道(3.25 mm×40 mm)内弹状流进行了可视化研究。实验中发现,低流速时,倾斜条件下,由于浮力的影响,气弹头部偏离管道中心,头部变尖,因而气弹运动速度加快,系数C₀随倾角增加而减小,漂移速度V₀呈相反变化趋势;高流速时,流动趋于稳定,倾角对气弹速度影响不显著,对C₀和V₀影响较小。通过实验数据评价了竖直条件下4种气弹速度计算关联式。以Froude数3.5为界,分别提出了倾斜条件下C₀和V₀计算关联式。

关键词: 窄矩形通道, 气弹速度, 倾斜, 弹状流