中国物理B ›› 2024, Vol. 33 ›› Issue (9): 94302-094302.doi: 10.1088/1674-1056/ad5d66

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Acoustic radiation force on a cylindrical composite particle with an elastic thin shell and an internal eccentric liquid column in a plane ultrasonic wave field

Rui-Qi Pan(潘瑞琪), Zhi-Wei Du(杜芷玮), Cheng-Hui Wang(王成会)†, Jing Hu(胡静)‡, and Run-Yang Mo(莫润阳)   

  1. Institute of Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi'an 710119, China
  • 收稿日期:2024-04-12 修回日期:2024-06-14 接受日期:2024-07-01 发布日期:2024-08-27
  • 通讯作者: Cheng-Hui Wang, Jing Hu E-mail:wangld001@snnu.edu.cn;hjwlx@snnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12374441 and 11974232) and the Fund from Yulin Science and Technology Bureau (Grant No. CXY-2022-178).

Acoustic radiation force on a cylindrical composite particle with an elastic thin shell and an internal eccentric liquid column in a plane ultrasonic wave field

Rui-Qi Pan(潘瑞琪), Zhi-Wei Du(杜芷玮), Cheng-Hui Wang(王成会)†, Jing Hu(胡静)‡, and Run-Yang Mo(莫润阳)   

  1. Institute of Shaanxi Key Laboratory of Ultrasonics, Shaanxi Normal University, Xi'an 710119, China
  • Received:2024-04-12 Revised:2024-06-14 Accepted:2024-07-01 Published:2024-08-27
  • Contact: Cheng-Hui Wang, Jing Hu E-mail:wangld001@snnu.edu.cn;hjwlx@snnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12374441 and 11974232) and the Fund from Yulin Science and Technology Bureau (Grant No. CXY-2022-178).

摘要: A model with three-layer structure is introduced to explore the acoustic radiation force (ARF) on composite particles with an elastic thin shell. Combing acoustic scattering of cylinder and the thin-shell theorem, the ARF expression was derived, and the longitudinal and transverse components of the force and axial torque for an eccentric liquid-filled composite particle was obtained. It was found that many factors, such as medium properties, acoustic parameters, eccentricity, and radius ratio of the inner liquid column, affect the acoustic scattering field of the particle, which in turn changes the forces and torque. The acoustic response varies with the particle structures, so the resonance peaks of the force function and torque shift with the eccentricity and radii ratio of particle. The acoustic response of the particle is enhanced and exhibits higher force values due to the presence of the elastic thin shell and the coupling effect with the eccentricity of the internal liquid column. The decrease of the inner liquid density may suppress the high-order resonance peaks, and internal fluid column has less effects on the change in force on composite particle at $ka>3$, while limited differences exist at $ka<3$. The axial torque on particles due to geometric asymmetry is closely related to $ka$ and the eccentricity. The distribution of positive and negative force and torque along the axis $ka$ exhibits that composite particle can be manipulated or separated by ultrasound. Our theoretical analysis can provide support for the acoustic manipulation, sorting, and targeting of inhomogeneous particles.

关键词: acoustic radiation force, acoustic scattering of cylinders, elastic shell, composite particles

Abstract: A model with three-layer structure is introduced to explore the acoustic radiation force (ARF) on composite particles with an elastic thin shell. Combing acoustic scattering of cylinder and the thin-shell theorem, the ARF expression was derived, and the longitudinal and transverse components of the force and axial torque for an eccentric liquid-filled composite particle was obtained. It was found that many factors, such as medium properties, acoustic parameters, eccentricity, and radius ratio of the inner liquid column, affect the acoustic scattering field of the particle, which in turn changes the forces and torque. The acoustic response varies with the particle structures, so the resonance peaks of the force function and torque shift with the eccentricity and radii ratio of particle. The acoustic response of the particle is enhanced and exhibits higher force values due to the presence of the elastic thin shell and the coupling effect with the eccentricity of the internal liquid column. The decrease of the inner liquid density may suppress the high-order resonance peaks, and internal fluid column has less effects on the change in force on composite particle at $ka>3$, while limited differences exist at $ka<3$. The axial torque on particles due to geometric asymmetry is closely related to $ka$ and the eccentricity. The distribution of positive and negative force and torque along the axis $ka$ exhibits that composite particle can be manipulated or separated by ultrasound. Our theoretical analysis can provide support for the acoustic manipulation, sorting, and targeting of inhomogeneous particles.

Key words: acoustic radiation force, acoustic scattering of cylinders, elastic shell, composite particles

中图分类号:  (Nonlinear acoustics)

  • 43.25.+y
43.35.+d (Ultrasonics, quantum acoustics, and physical effects of sound)