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The acoustic radiation force produced by ultrasonic waves is the "workhorse"of particle manipulation in acoustofluidics. Nonspherical particles are alsosubjected to a mean torque known as the acoustic radiation torque. Togetherthey constitute the mean-acoustic fields exerted on the particle. Analyticalmethods alone cannot calculate these fields on arbitrarily shaped particles inactual fluids and no longer fit for purpose. Here, a semi-analytical approachis introduced for handling subwavelength axisymmetric particles immersed in anisotropic Newtonian fluid. The obtained mean-acoustic fields depend on thescattering coefficients that reflect the monopole and dipole modes. Thesecoefficients are determined by numerically solving the scattering problem. Ourmethod is benchmarked by comparison with the exact result for a subwavelengthrigid sphere in water. Besides, a more realistic case of a red blood cellimmersed in blood plasma under a standing ultrasonic wave is investigated withour methodology.

Mean-acoustic fields exerted on a subwavelength axisymmetric particle