Influence of rigid wall on the nonlinear pulsation of nearby bubble

Ultrasonics Sonochemistry

Min Zhou¹  Xun Wang²  Lingling Zhang²  Weizhong Chen³  Zekun Zhang⁴ 

[1] Corresponding author.;Kaiserslautern Intelligent Manufacturing School, Shanghai Dianji University, Shanghai 201306, China;Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China;School of Science, Xi’an Polytechnic University, Xi’an 710048, China;

关键词: Bubble dynamics;    Nonlinear pulsation;    Rigid wall;    Bifurcation diagram;   

DOI  :  

来源: DOAJ

【 摘 要 】

This paper mainly focuses on the nonlinear pulsation of a bubble near the rigid wall. Dynamics of near-wall bubble and free bubble are discussed and compared in details. Investigation reveals as the driving acoustic pressure amplitude increases, nonlinear pulsation of bubble becomes intense gradually. Besides, decreasing the viscosity of host liquid is advantageous for the nonlinear pulsation of bubble. Bifurcation diagrams of bubble radius show acoustic reflection of the rigid wall makes the initial bifurcation appear at low driving acoustic amplitude and on bubble with small ambient radius, and makes the bifurcation still exist for bubble in high-viscosity liquids. That indicates the rigid wall will produce enhancement on the nonlinearity of nearby bubble. As the bubble approaches the wall, the enhancement becomes strong. Moreover, research on the influence of driving frequency shows the rigid wall makes the frequency band corresponding to chaos around the resonant frequency of free bubble shift downward.

【 授权许可】

Unknown