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为了揭示团状流中夹带液滴的产生机理,本文建立了气液团状流内界面波运动模型。该模型可以预测界面波沿壁而的运动规律及界面波特性(波幅、波速)的变化特点,理论解释团状流扰动性大的特点。结果表明:当气速较小或液速较大时,界面波在运动过程中存在反转现象,当进入环状流时,反转现象消失。界面波波速与最大波幅均随气、液速度的增大而增大,而临界波幅主要受气速的影响。通过与实验结果对比,证明该模型可以较好地反映界面波在团状流条件下的运动特点。
In order to reveal the generation mechanism of entrained droplets in the slug flow, a model of interface wave motion in a gas-liquid slug flow was established. The model predicts the variation of interface wave along the wall and the characteristics of the interface wave (amplitude and wave velocity), and the theory explains the characteristics of slug-flow perturbation. The results show that when the gas velocity is small or the liquid velocity is high, the interface wave reverses during the movement. When entering the annular flow, the inversion phenomenon disappears. The interface wave velocity and maximum amplitude both increase with the increase of gas and liquid velocities, while the critical amplitude is mainly affected by gas velocity. Compared with the experimental results, it is proved that the model can better reflect the movement characteristics of interface wave under the condition of slug flow.