Interaction between particles and bubbles driven by ultrasound: Acoustic radiation force on an elastic particle immersed in the ideal fluid near a bubble.

A theoretical model is proposed to investigate the acoustic radiation force on the elastic particle for coupled particle-bubble system. Based on the sound scattering theory, an analytical expression of the force function is obtained for the particle in plane wave sound field. Numerical simulations are presented for elastic particle of stainless steel, steel or brass. The results reveal that the presence of bubbles can affect the feature of radiation force curves of particles. The force curve fluctuates, and negative force emerges in the small kR region for certain distance between the bubble and particle. There are more sharp peaks and dips in the curves because of the resonance of the elasticity of the system and the resonant peaks of the acoustic radiation force transfer to low frequencies when the size of elastic particle is increased. The approximate positive flat region is shortened because of the presence of bubble, which may help to optimize the size ranges of particle for acoustic screening. This study provides for improvement of the acoustic manipulation theoretical model.