title: Analysis of the particle stability in a new designed ultrasonic levitation device.
abstract: The use of acoustic levitation in the fields of analytical chemistry and in the containerless processing of materials requires a good stability of the levitated particle. However, spontaneous oscillations and rotation of the levitated particle have been reported in literature, which can reduce the applicability of the acoustic levitation technique. Aiming to reduce the particle oscillations, this paper presents the analysis of the particle stability in a new acoustic levitator device. The new acoustic levitator consists of a piezoelectric transducer with a concave radiating surface and a concave reflector. The analysis is conducted by determining numerically the axial and lateral forces that act on the levitated object and by measuring the oscillations of a sphere particle by a laser Doppler vibrometer. It is shown that the new levitator design allows to increase the lateral forces and reduce significantly the lateral oscillations of the levitated object.
authors: Laser Applications Technology, Department of Mechanical Engineering, Ruhr-Universität Bochum, 44780 Bochum, Germany.
authors: Sebastian
authors: S
authors: Baer
authors: Marco A B
authors: MA
authors: Andrade
authors: Cemal
authors: C
authors: Esen
authors: Julio Cezar
authors: JC
authors: Adamowski
authors: Gustav
authors: G
authors: Schweiger
authors: Andreas
authors: A
authors: Ostendorf