Axial Acoustic Radiation Force of Gaussian Beam Incident on an Off-axis Spherical Particle Near Boundary

Abstract

Abstract: Based on scattering theory of sound waves, beam factor of a Gaussian beam is obtained with series expanding theory. Analytical expression of acoustic radiation force on a spherical particle near an impedance boundary is deduced. Numerical simulations of rigid and fluid particles are carried out and comparison with those in free space is made. Effects of reflecting coefficient, distance between particle and boundary and waist radius on acoustic radiation force are discussed. It shows that the acoustic radiation force increases along with reflecting coefficient of the boundary, while the peaks are not changed. At some appropriate frequencies, negative acoustic radiation force can be obtained. The acoustic radiation force changes periodically with the distance between particle and boundary. Moreover, the waist radius mainly affects acoustic radiation force at middle and high frequencies. As the particle off-axis distance and angle deviation increases, attenuation of acoustic radiation force becomes obvious. This work provides a theoretical basis for particle manipulation using Gaussian beam.

Key words: acoustic radiation force, Gaussian beam, spherical particle, waist radius

CLC Number:

ZANG Yuchen. Axial Acoustic Radiation Force of Gaussian Beam Incident on an Off-axis Spherical Particle Near Boundary[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2020, 37(4): 459-466.

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