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Dynamics of an acoustically levitated particle using the lattice Boltzmann method

Published online by Cambridge University Press:  17 January 2008

G. BARRIOS  and
R. RECHTMAN
G. BARRIOS
Affiliation:
Centro de Investigación en Energía, Universidad Nacional Autónomade México, Apdo. Postal 34, Temixco, Morelos, 62580 Mexicorrs@cie.unam.mx
R. RECHTMAN
Affiliation:
Centro de Investigación en Energía, Universidad Nacional Autónomade México, Apdo. Postal 34, Temixco, Morelos, 62580 Mexicorrs@cie.unam.mx
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Abstract

When the acoustic force inside a cavity balances the gravitational force on a particle the result is known as acoustic levitation. Using the lattice Boltzmann equation method we find the acoustic force acting on a rounded particle for two different single-axis acoustic levitators in two dimensions, the first with plane waves, the second with a rounded reflector that enhances the acoustic force. With no gravitational force, a particle oscillates around a pressure node; in the presence of gravity the oscillation is shifted a small vertical distance below the pressure node. This distance increases linearly as the density ratio between the solid particle and fluid grows. For both cavities, the particle oscillates with the frequency of the sound source and its harmonics and in some cases there is a much smaller second dominant frequency. When the momentum of the acoustic source changes, the oscillation around the average vertical position can have both frequencies mentioned above. However, if this quantity is large enough, the oscillations of the particle are aperiodic in the cavity with a rounded reflector.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 596 , 25 January 2008 , pp. 191 - 200
Copyright
Copyright © Cambridge University Press 2008

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