【作者】 乔玉配； 张小凤；

【Author】 QIAO Yu-pei;ZHANG Xiao-feng;College of Physics and Information Technology, Shaanxi Normal University,Shaanxi Key Laboratory of Ultrasonics;

【机构】 陕西师范大学物理学与信息技术学院陕西省超声学重点实验室；

【摘要】 本文应用时域有限差分法,建立了二维情况下水中两个或三个刚性圆柱形粒子在调制高斯脉冲的作用下声辐射力计算的仿真模型,研究了水中柱形粒子间的声相互作用对粒子在声场中所受声辐射力的影响。仿真结果表明,在刚性边界附近,刚性圆柱形粒子的声辐射力与入射波、刚性边界的反射波以及其它刚性粒子的散射波形成的干涉有关。当声场中有两个粒子且粒子的位置关于声波传播轴对称放置时,粒子所受的横向声辐射力大小相等,方向相反,轴向声辐射力相等;当声场中有三个粒子,其中两个粒子的位置关于声波传播轴对称位置放置,一个粒子位于声波传输轴上时,粒子所受的横向声辐射力大小相等,方向相反,轴向声辐射力相等,位于传播轴上粒子的横向声辐射力趋向于零,轴向声辐射力较大。该研究为多粒子存在条件下单个粒子的操控提供了理论依据。更多还原

【Abstract】 In this paper, the simulation model related to calculate the acoustic radiation force on two or three rigid cylindrical particles in water under the modulated Gaussian beam is established using the two-dimensional finite difference time domain method. The effects of the acoustic interaction among particles on acoustic radiation force of rigid cylindrical particles are analyzed. The simulation results show that the acoustic radiation force of the particles near the absolutely rigid boundary relate to the interference of the incident wave, the reflection wave of the rigid boundary, and the scattering wave form the other rigid cylindrical particles. The transverse acoustic radiation force is equal in magnitude and opposite in direction and the axial acoustic radiation force is equal when there are two particles in the sound field, and the position of the particle is symmetrical about the sound wave propagation axis. When there are three particles in the sound field, the transverse acoustic radiation force is equal in magnitude and opposite in direction and the axial acoustic radiation force is equal when the position of the two particles on the acoustic wave propagation axis symmetric position placement, and the transverse acoustic radiation force of particle on the propagation axis tends to zero, the axial acoustic radiation force is larger. The study will give a basement for acoustic particle manipulation when many particles surround the target particle.更多还原