Acoustic radiation torque on a spheroidal droplet in standing Bessel beams  

作　　者：ZANG Yuchen LIN Weijun SU Chang WU Pengfei 

机构地区：[1]Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190 [2]University of Chinese Academy of Sciences,Beijing 100049

出　　处：《Chinese Journal of Acoustics》2021年第4期566-582,共17页声学学报（英文版）

基　　金：the National Natural Science Foundation of China(81527901,11604361,91630309);the National Key Research and Development Project(2018YFC0114900);the Key Research Program of Frontier Sciences,CAS(ZDBS-LY-SLH037)。

摘　　要：In the actual acoustic manipulation,a droplet often takes the shape of a spheroid due to the combined effects of the acoustic radiation force,surface tension and gravitational force,which can be rotated by the torque in helicoidal sound fields.Based on the sound scattering theory,the scattering coefficients of a spheroidal droplet in standing Bessel beams are solved using the partial-wave series expansion method,and the analytical expression of the acoustic radiation torque is also provided.On this basis,the results for both the incompressible and the compressible spheroidal droplets are calculated numerically.The simulated results show that the acoustic radiation torque on the incompressible droplet is more closely related to the half-cone angle of the beam,while the torque on the compressible droplet is more dependent on specific frequencies.The growth of the beam order will increase the peaks of the acoustic radiation torque,but it is difficult to obtain an obvious radiation torque for compressible droplets at low and medium frequencies.The results of this study are expected to provide a theoretical guide for manipulating droplets using helicoidal acoustic beams.

关 键 词：BESSEL COMPRESSIBLE beam 

分 类 号：O42[理学—声学]