中文摘要：

通过可视化观察和数码照片对摇摆状态下光滑有机玻璃管内气液两相流流型进行分类和定义，并分析了不同管径、摇摆角度以及摇摆周期对流型之间转变的影响。结果表明：在液相折算流速一样的情况下，管径增加、摇摆周期缩短或摇摆角度减小会使得环状流形成需要更高的气体折算流速；弹状流向搅混流转变所需气相流量则随着管径的减小、摇摆周期的增加或摇摆角度的减小而增加。而在气相折算流速一样的条件下，管径增加、摇摆周期缩短或摇摆角度增大会使泡状流产生需要更高的液相流量。

英文摘要：

Based on visual observation and digital images, two-phase flow patterns in smooth glass tubes under rolling condition were identified. In the paper, effects of tube size, rolling angle and rolling period on the transition between different flow patterns were analyzed in detail. The results showed that with the same superficial liquid velocity, increased tube size, shortened rolling period or decreased rolling angle could make annular flow beginning need higher than superficial gas velocity, and the transition from slug flow to churn flow also need more gas flow rate when tube size and rolling angle decreased, or rolling period increased. Besides, when the superficial gas velocity kept constant and tube size increased, rolling period shortened or rolling angle increased, the transition from slug flow to bubble flow requires more liquid flow rate.