Acoustic radiation force and torque on an absorbing compressible particle in an inviscid fluid

被引:71
|
作者
Silva, Glauber T. [1 ]
机构
[1] Univ Fed Alagoas, Inst Fis, Phys Acoust Grp, BR-57072900 Maceio, AL, Brazil
来源
关键词
NON-DIFFRACTING BEAMS; BESSEL BEAM; ELASTIC SPHERE; WAVE; PRESSURE;
D O I
10.1121/1.4895691
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Exact formulas of the acoustic radiation force and torque exerted by an arbitrary time-harmonic wave on an absorbing compressible particle that is suspended in an inviscid fluid are presented. It is considered that the particle diameter is much smaller than the incident wavelength, i.e., the so-called Rayleigh scattering limit. Moreover, the particle absorption assumed here is due to the attenuation of compressional waves only. Shear waves inside and outside the particle are neglected, since the inner and outer viscous boundary layer of the particle are supposed to be much smaller than the particle radius. The obtained radiation force formulas are used to establish the trapping conditions of a particle by a single-beam acoustical tweezer based on a spherically focused ultrasound transducer. In this case, it is shown that the particle absorption has a pivotal role in single-beam trapping at the transducer focal region. Furthermore, it is found that only the first-order Bessel vortex beam can generate the radiation torque on a small particle. In addition, numerical evaluation of the radiation force and torque exerted on a benzene and an olive oil droplet suspended in water are presented and discussed. (C) 2014 Acoustical Society of America.
引用
收藏
页码:2405 / 2413
页数:9
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