The acoustic radiation force produced by ultrasonic waves is the “workhorse” of particle manipulation in acoustofluidics. Nonspherical particles are also subjected to a mean torque known as the acoustic radiation torque. Together they constitute the mean acoustic fields exerted on the particle. Analytical methods alone cannot calculate these fields on arbitrarily shaped particles in actual fluids and are no longer fit for purpose. Here, a semi-analytical approach is introduced for handling subwavelength axisymmetric particles immersed in an isotropic Newtonian fluid. The obtained mean acoustic fields depend on the scattering coefficients that reflect the monopole and dipole modes. These coefficients are determined by numerically solving the scattering problem. Our method is benchmarked by comparison with the exact result for a subwavelength rigid sphere in water. Besides, a more realistic case of a red blood cell immersed in blood plasma under a standing ultrasonic wave is investigated with our methodology.
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July 2021
July 16 2021
Mean acoustic fields exerted on a subwavelength axisymmetric particlea)
Special Collection:
Theory and Applications of Acoustofluidics
Everton B. Lima;
Everton B. Lima
Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas
, Maceió, Alabama 57072-970, Brazil
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Glauber T. Silva
Glauber T. Silva
b)
Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas
, Maceió, Alabama 57072-970, Brazil
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b)
Electronic mail: [email protected], ORCID: 0000-0001-8911-5848.
a)
This paper is part of a special issue on Theory and Applications of Acoustofluidics.
J. Acoust. Soc. Am. 150, 376–384 (2021)
Article history
Received:
April 12 2021
Accepted:
June 25 2021
Citation
Everton B. Lima, Glauber T. Silva; Mean acoustic fields exerted on a subwavelength axisymmetric particle. J. Acoust. Soc. Am. 1 July 2021; 150 (1): 376–384. https://doi.org/10.1121/10.0005625
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