Acoustic Interaction Forces and Torques Acting on Suspended Spheres in an Ideal Fluid

Lopes, J. H.; Azarpeyvand, Mahdi; Silva, Glauber T.

doi:10.1109/tuffc.2015.2494693

Cited by 44 publications

(36 citation statements)

References 74 publications

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“…The fluid velocity is the sum of the incident and scattered velocities, v = v in + v sc . Substituting the total fluid velocity into the far-field expression of the radiation torque and noting that vv = (1/2)Re[vv * ], we find [28]…”

Section: Acoustic Radiation Torquementioning

confidence: 99%

Acoustic spin transfer to a subwavelength spheroidal particle

et al. 2020

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We demonstrate that the acoustic spin of a first-order Bessel beam can be transferred to a subwavelength (prolate) spheroidal particle at the beam axis in a viscous fluid. The induced radiation torque is proportional to the acoustic spin, which scales with the beam energy density. The analysis of the particle rotational dynamics in a Stokes' flow regime reveals that its angular velocity varies linearly with the acoustic spin. Asymptotic expressions of the radiation torque and angular velocity are obtained for a quasispherical and infinitely thin particle. Excellent agreement is found between the theoretical results of radiation torque and finite element simulations. The induced particle spin is predicted and analyzed using the typical parameter values of the acoustical vortex tweezer and levitation devices. We discuss how the beam energy density and fluid viscosity can be assessed by measuring the induced spin of the particle.

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Section: Acoustic Radiation Torquementioning

confidence: 99%

Acoustic spin transfer to a subwavelength spheroidal particle

et al. 2020

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“…When two or more particles are present in the medium, rescattering events give rise to the acoustic interaction forces between the particles. This force, also known as the secondary radiation force, can be either attractive or repulsive [32,33]. The secondary radiation forces can disturb the acoustic energy landscape of the primary radiation force.…”

Section: F Secondary Acoustic Radiation Forcementioning

confidence: 99%

Particle Patterning by Ultrasonic Standing Waves in a Rectangular Cavity

et al. 2019

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Different types of particle and/or cell patterning in acoustic cavities produced by the radiation force of ultrasonic standing waves have been observed. However, most explanations of this phenomenon are constrained to particles much smaller than the wavelength (i.e., the so-called Rayleigh regime). Here, we present a theoretical model for acoustic trapping and patterning of particles/cells in a rectangular cavity beyond the Rayleigh regime. A simple closed-form expression of the radiation-force potential for particles of virtually any size immersed in a fluid is obtained. Particles with a size comparable to one wavelength (Mie particles) can be trapped in acoustic potential wells, whose stability is quantified by the trap stiffness. Our findings reveal that an acoustic trap can occur at a pressure node, antinode, and midpoint (i.e., a point midway between two nodes). These locations depend on the acoustic parameters of the particle and surrounding fluid (density, longitudinal, and shear speed of sound) and the ratio of particle size to wavelength. We also investigate the effects of the secondary radiation forces on trapping stability. We determine the possible acoustic patterns formed with polystyrene particles and osmotically swollen red blood cells (SRBCs). The conditions that may lead to one particle/cell per acoustic well patterning are discussed. A set of patterning experiments is performed with an acoustofluidic rectangular device, operating at 6.5-MHz frequency, using polystyrene particles with diameters of 10 μm (Rayleigh particles) and 75 μm (Mie particles) immersed in distilled water. The obtained experimental results are consistent with our theoretical predictions. The present study can help in designing acoustofluidic devices with the ability to spatially arrange larger, or more closely spaced particles, cells, and other microorganisms .

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“…When two microvesicles of radii a in a pressure node are very close to each other, the secondary radiation force effects (interaction forces) may take place [42,43]. In this case, the magnitude of the interaction force is [42] |F int | ≈ π a 2 (2σ 0 /3)(a/d ) 4 , where d is the interparticle distance.…”

Section: Effects Of Other Forcesmentioning

confidence: 99%

Acoustic deformation for the extraction of mechanical properties of lipid vesicle populations

et al. 2019

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We use an ultrasonic standing wave to simultaneously trap and deform thousands of soft lipid vesicles immersed in a liquid solution. In our device, acoustic radiation stresses comparable in magnitude to those generated in optical stretching devices are achieved over a spatial extent of more than ten acoustic wavelengths. We solve the acoustic scattering problem in the long-wavelength limit to obtain the radiation stress. The result is then combined with thin-shell elasticity theory to form expressions that relate the deformed geometry to the applied acoustic field intensity. Using observation of the deformed geometry and this model, we rapidly extract mechanical properties, such as the membrane Young's modulus, from populations of lipid vesicles.

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Acoustic Interaction Forces and Torques Acting on Suspended Spheres in an Ideal Fluid

Cited by 44 publications

References 74 publications

Acoustic spin transfer to a subwavelength spheroidal particle

Acoustic spin transfer to a subwavelength spheroidal particle

Particle Patterning by Ultrasonic Standing Waves in a Rectangular Cavity

Acoustic deformation for the extraction of mechanical properties of lipid vesicle populations

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