Key Laboratory of Modern Acoustics, Ministry of Education, Institution of Acoustics, Nanjing University, Nanjing 210093, China.
Key Laboratory of Modern Acoustics, Ministry of Education, Institution of Acoustics, Nanjing University, Nanjing 210093, China.
Ultrason Sonochem. 2023 Mar;94:106352. doi: 10.1016/j.ultsonch.2023.106352. Epub 2023 Mar 3.
The interaction between spherical cavitation bubble and flat wall is transformed into that between the real bubble and imaging bubble by the method of images. Firstly, we investigate the dynamics of real bubble and matched, inversed or mis-matched imaging bubble driven by a small amplitude ultrasound, revealing the characteristics of the interaction between cavitation bubble and rigid, soft and impedance walls. Then, we emphatically study the dynamics of real bubble and mis-matched imaging bubble driven by a finite amplitude ultrasound, and the interaction characteristics between cavitation bubble and real impedance wall are revealed. The results show that the cavitation bubble is always close to the rigid wall and far away from the soft wall; For the impedance wall, whether the cavitation bubble is far away or close depends on the specific wall parameters. Moreover, the direction and magnitude of bubble's translation velocity can be changed by adjusting the driving parameters. Understanding the interaction between cavitation bubble and impedance wall is of great significance for efficient application of ultrasonic cavitation.
通过镜像法，将球形空化泡与平壁之间的相互作用转化为真实空化泡与成像空化泡之间的相互作用。首先，我们研究了在小振幅超声驱动下真实空化泡和匹配、反向或不匹配的成像空化泡的动力学，揭示了空化泡与刚性、柔性和阻抗壁相互作用的特点。然后，我们着重研究了在有限振幅超声驱动下真实空化泡和不匹配成像空化泡的动力学，揭示了空化泡与真实阻抗壁之间的相互作用特性。结果表明，空化泡总是靠近刚性壁而远离柔性壁；对于阻抗壁，空化泡是远离还是靠近取决于特定的壁参数。此外，通过调整驱动参数可以改变气泡的平移速度方向和大小。理解空化泡与阻抗壁之间的相互作用对于超声空化的有效应用具有重要意义。
