Frequency spectrum of the noise emitted by two interacting cavitation bubbles in strong acoustic fields
Frequency spectrum of the noise emitted by two interacting cavitation bubbles in strong acoustic fields
复制标题
强声场中两个相互作用的空化气泡发出的噪声的频谱
DOI：
10.1103/physreve.85.036312
复制
发表时间：
2012-03-22
影响因子：
2.4
通讯作者：
Chen, Darong
中科院分区：
文献类型：
--
作者：
Jiang, Liang;Liu, Fengbing;Chen, Darong
本文数值研究了两个相互作用的空化气泡在频率为515 kHz的强声场中的动力学和声发射。通过比较单个气泡在给定压力波激励下的动力学特性，选取环境半径分别为2和5µm的气泡作为研究对象，讨论了气泡-气泡相互作用对气泡的动力学行为和声发射的影响。结果表明，除了外部驱动压力波外，气泡之间的相互作用对气泡的振动也有额外的非线性影响，并且随着相互作用的加强，减小气泡之间的距离，可以逐渐抑制较小气泡的动力学。此外，从气泡声发射的频谱可以很容易地观察到环境变化对气泡振动非线性的改善，这通过显示出亚谐、超谐和宽带分量的适当发展来解释这种变化。
The dynamics and acoustic emission of two interacting cavitation bubbles exposed to strong acoustic fields with a frequency of 515 KHz are investigated numerically in this paper. After comparing the dynamics of a single bubble excited by the given pressure waves, bubbles with ambient radii of 2 and 5 mu m were chosen to be studied to discuss the influence of the mutual bubble-bubble interaction on the dynamic behaviors and acoustic emission of the bubbles. The results show that, aside from the external driving pressure waves, the interaction between the bubbles imposes an extra nonlinear effect on the oscillations of the bubbles and that the dynamics of the smaller bubble could be suppressed gradually with the enhancement of this mutual interaction by decreasing the distance between the bubbles. Moreover, the improvement in the oscillation nonlinearity of the bubbles due to the change in the ambient circumstance could readily be observed from the frequency spectra of the bubbles' acoustic emission, which interprets the change by exhibiting an appropriate development of the subharmonics, the ultraharmonics, and the broadband component.