The dynamics and breakup of bubbles in swirl-venturi bubble generator (SVBG) are explored in this work. The three-dimensional movement process and breakup phenomena of bubbles are captured by one high-speed camera system with two cameras while the distribution of swirling flow field is recorded through Particle Image Velocimetry technology. It is revealed that bubbles have two motion trajectories, which are deeply related to bubble breakup. One trajectory is that mother bubble moves upward in an axial direction of the SVBG to the diverging section, and the other trajectory is that mother bubble rotates obliquely upward to another side-wall along the radial direction. Meanwhile, binary breakup, shear-off-induced breakup, static erosive breakup, and dynamic erosive breakup are observed. For relatively high liquid Reynolds number, vortex flow regions are extended and the bubble size is reduced. Furthermore, it is worth noting that the number of microbubbles increases significantly for intensive swirling flow.

中文翻译：

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涡流文丘里气泡发生器中气泡破裂的可视化研究

在这项工作中探讨了漩涡文丘里气泡发生器 (SVBG) 中气泡的动力学和破裂。气泡的三维运动过程和破裂现象由一个带有两个摄像头的高速摄像系统捕捉，同时通过粒子图像测速技术记录旋流场的分布。结果表明，气泡有两条运动轨迹，与气泡破裂密切相关。一种轨迹是母泡沿SVBG的轴向向上运动至发散段，另一种轨迹是母泡沿径向斜向上旋转至另一侧壁。同时，观察到二元破碎、剪切诱导破碎、静态侵蚀破碎和动态侵蚀破碎。对于相对较高的液体雷诺数，涡流区域扩大，气泡尺寸减小。此外，值得注意的是，对于密集的旋流，微气泡的数量显着增加。