As an important application of acoustic radiation, the research of “acoustic tweezers” and acoustic levitation has become a research hotspot in the fields of biomedical ultrasound and materials science. However, in the current study, it is difficult to calculate the acoustic radiation force of particles near complex boundaries using analytical methods.
In order to solve this problem, Chang Qin, a doctoral student in the Laboratory of Ultrasound of the Institute of Acoustics of the Chinese Academy of Sciences, and his supervisor Lin Weijun and others used the finite element method to establish a numerical model to successfully calculate the acoustic radiation force of the Gaussian beam on the rigid cylinder near the rigid corner, and analyzed in detail the influence of the geometric parameters, sound source parameters and particle spatial position on the acoustic radiation force of the rigid corner.
The results were published in the academic journal Chinese Physics B.
Fig. 1 Schematic diagram of a rigid cylindrical particle incident by a Gaussian beam near a rigid corner of water (Figure/Institute of Acoustics, Chinese Academy of Sciences)
In this numerical model, the sound field is a superposition of the background sound field produced by the sound source and the scattered sound field generated by particles and boundaries. Therefore, after determining the relevant parameters of the sound source, particle and boundary, the sound field distribution on the particle surface can be obtained through simulation, and then the acoustic radiation force of the particle can be calculated.
The calculation results show that the variation law of acoustic radiation force of particles near rigid corners depends on the presence or absence of standing waves in the medium, and the change trend of standing waves is significantly affected by the dimensionless frequency of the sound source and the relative position of particles and boundaries.
Figure 2 Acoustic radiation force function of particles at different locations near rigid corners. (a) and (b) are the x and y components of the acoustic radiation force function, respectively (Figure/Institute of Acoustics, Chinese Academy of Sciences)
In this study, a numerical method for calculating the acoustic radiation force of particles near complex boundaries is proposed, which is expected to improve and develop particle acoustic manipulation technology in practical applications. (Source: Institute of Acoustics, Chinese Academy of Sciences)
Related paper information:https://doi.org/10.1088/1674-1056/ac2d1f
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