Translation of cavitation bubble near the different walls

Shaoyang Kou; Weizhong Chen; Yaorong Wu; Guoying Zhao

doi:10.1016/j.ultsonch.2023.106352

Translation of cavitation bubble near the different walls

Ultrason Sonochem. 2023 Mar:94:106352. doi: 10.1016/j.ultsonch.2023.106352. Epub 2023 Mar 3.

Authors

Shaoyang Kou¹, Weizhong Chen², Yaorong Wu¹, Guoying Zhao¹

Affiliations

¹ Key Laboratory of Modern Acoustics, Ministry of Education, Institution of Acoustics, Nanjing University, Nanjing 210093, China.
² Key Laboratory of Modern Acoustics, Ministry of Education, Institution of Acoustics, Nanjing University, Nanjing 210093, China. Electronic address: wzchen@nju.edu.cn.

Abstract

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.

Keywords: Cavitation bubble; Method of images; Two bubble dynamics; Walls.