Radial oscillation and translational motion of a gas bubble in a micro-cavity

Ultrasonics Sonochemistry

Jianzhong Guo¹  Jing Hu¹  Runyang Mo²  Chenghui Wang²  Shi Chen³  Fan Li³  Xianmei Zhang³  Honghan Liu³  Jiaxin He³ 

[1] Institute of Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi’an 710119, China;Corresponding authors.;Institute of Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi’an 710119, China;

关键词: Bubble nucleus;    Spherical liquid cavity;    Cavitation bubble;    Radial oscillation;    Translational motion;   

DOI  :  

来源: DOAJ

【 摘 要 】

According to classical nucleation theory, a gas nucleus can grow into a cavitation bubble when the ambient pressure is negative. Here, the growth process of a gas nucleus in a micro-cavity was simplified to two “events”, and the full confinement effect of the surrounding medium of the cavity was considered by including the bulk modulus in the equation of state. The Rayleigh–Plesset-like equation of the cavitation bubble in the cavity was derived to model the radial oscillation and translational motion of the cavitation bubble in the local acoustic field. The numerical results show that the nucleation time of the cavitation bubble is sensitive to the initial position of the gas nucleus. The cavity size affects the duration of the radial oscillation of the cavitation bubble, where the duration is shorter for smaller cavities. The equilibrium radius of a cavitation bubble grown from a gas nucleus increases with increasing size of the cavity. There are two possible types of translational motion: reciprocal motion around the center of the cavity and motion toward the cavity wall. The growth process of gas nuclei into cavitation bubbles is also dependent on the compressibility of the surrounding medium and the magnitude of the negative pressure. Therefore, gas nuclei in a liquid cavity can be excited by acoustic waves to form cavitation bubbles, and the translational motion of the cavitation bubbles can be easily observed owing to the confining influence of the medium outside the cavity.

【 授权许可】

Unknown