Ma Yan, Zhao Feiyan
College of Physics and Electronic Information Engineering, Engineering Research Center of Nanostructure and Functional Materials, Ning Xia Normal University, Gu Yuan 756000, China.
Ultrason Sonochem. 2021 Jun;74:105573. doi: 10.1016/j.ultsonch.2021.105573. Epub 2021 Apr 22.
The scattered acoustic pressure and scattered cross section of bubbles is studied using the scattered theory of bubbles. The nonlinear oscillations of bubbles and the scattering acoustic fields of a spherical bubble cluster are numerically simulated based on the bubble dynamic and fluid dynamic. The influences of the interaction between bubbles on scattering acoustic field of bubbles are researched. The results of numerical simulation show that the oscillation phases of bubbles are delayed to a certain extent at different positions in the bubble cluster, but the radii of bubbles during oscillation do not differ too much at different positions. Furthermore, directivity of the acoustic scattering of bubbles is obvious. The scattered acoustic pressures of bubbles are different at the different positions inside and outside of the bubble cluster. The scattering acoustic fields of a spherical bubble cluster depend on the driving pressure amplitude, driving frequency, the equilibrium radii of bubbles, bubble number and the radius of the spherical bubble cluster. These theoretical predictions provide a further understanding of physics behind ultrasonic technique and should be useful for guiding ultrasonic application.
利用气泡散射理论研究了气泡的散射声压和散射截面。基于气泡动力学和流体动力学，对气泡的非线性振荡以及球形气泡簇的散射声场进行了数值模拟。研究了气泡间相互作用对气泡散射声场的影响。数值模拟结果表明，气泡簇中不同位置的气泡振荡相位在一定程度上有所延迟，但振荡过程中不同位置气泡的半径差异不大。此外，气泡声散射的指向性明显。气泡簇内外不同位置的气泡散射声压不同。球形气泡簇的散射声场取决于驱动压力幅值、驱动频率、气泡平衡半径、气泡数量以及球形气泡簇的半径。这些理论预测有助于进一步理解超声技术背后的物理原理，对指导超声应用具有重要意义。
