Experimental determination of the dynamics of an acoustically levitated sphere
Levitation of solids and liquids by ultrasonic standing waves is a promising technique to manipulate materials without contact. When a small particle is introduced in certain areas of a standing wave field, the acoustic radiation force pushes the particle to the pressure node. This movement is follo...
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Veröffentlicht in: | Journal of applied physics 2014-11, Vol.116 (18) |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Levitation of solids and liquids by ultrasonic standing waves is a promising technique
to manipulate materials without contact. When a small particle is introduced in certain
areas of a standing wave field, the acoustic radiation force pushes the particle to the
pressure
node. This movement is followed by oscillations of the levitated particle. Aiming to
investigate the particle oscillations in acoustic levitation, this paper presents the
experimental and numerical characterization of the dynamic behavior of a levitated sphere.
To obtain the experimental response, a small sphere is lifted by the acoustic radiation
force. After the sphere lift, it presents a damped oscillatory behavior, which is recorded
by a high speed camera. To model this behavior, a mass-spring-damper system is
proposed. In this model, the acoustic radiation force that acts on the sphere is
theoretically predicted by the Gor'kov theory and the viscous forces are modeled by two
damping terms, one term proportional to the square of the velocity and another term
proportional to the particle velocity. The proposed model was experimentally verified by
using different values of sound
pressure amplitude. The comparison between numerical and experimental
results shows that the model can accurately describe the oscillatory behavior of the
sphere in an acoustic levitator. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.4901579 |