物理学报2024，Vol.73Issue(15)：54-62,9.DOI:10.7498/aps.73.20240606
黏弹性介质包裹的液体腔内球状泡群耦合振动模型
A model of coupled oscillation of bubble cluster in liquid cavity wrapped by viscoelastic medium
摘要
Abstract
Considering the interactions between bubbles in a multi-bubble system in a liquid micro-cavity,a spherical bubble cluster in a liquid cavity is modeled in order to describe the dynamical effect of the viscoelastic medium outside the liquid cavity on the oscillation of bubbles,and the coupled equations of bubbles are obtained.Subsequently,the acoustic response characteristics of bubbles are investigated by analyzing the radial oscillation,the stability of the non-spherical shape of bubbles and the threshold of inertial cavitation.The results show that the confinement of the cavity and the bubble cluster facilitates the suppression of bubble oscillation,however,it might enhance the nonlinear properties of bubbles to a certain extent.From the acoustic response curve at 1 MHz,it is found that the main resonance peaks shift leftward with the increase of the bubble number,which means a minor resonant radius can be obtained.The nonlinear stability of bubbles in a confined environment is mainly determined by acoustic pressure amplitude and frequency,the initial bubble radius,and bubble number density,while the effect of the cavity radius is enhanced with the increase of the driving pressure.There is a minimum unstable driving acoustic pressure threshold,depending on the initial bubble radius,and the unstable regions are mainly located in a range of less than 4 μm.With the increase in bubble number density,the strip-type stable region scattered of the unstable region in the map is gradually transformed into a random patch-like distribution,which indicates that the bubble oscillation under high acoustic pressure is more sensitive to the parameters,and it is very susceptible to interference,produces unstable oscillation and then collapses.When the bubble equilibrium radius is in a range greater than 4 μm,the influences of frequency and bubble number density on the inertial thresholds are particularly significant.关键词
球状泡群/液体腔/空化气泡/耦合振动Key words
spherical bubble cluster/liquid cavity/cavitation bubbles/coupled oscillation引用本文复制引用
左馨怡,雷照康,武耀蓉,王成会..黏弹性介质包裹的液体腔内球状泡群耦合振动模型[J].物理学报,2024,73(15):54-62,9.基金项目
国家自然科学基金(批准号:12374441,11974232,12074238)资助的课题.Project supported by the the National Natural Science Foundation of China(Grant Nos.12374441,11974232,12074238). （批准号:12374441,11974232,12074238）
