Acoustic levitation of an object larger than the acoustic wavelength

Autor(es)

Andrade, Marco A. B. ; Okina, Fabio T. A. ; Bernassau, Anne L. ; Adamowski, Julio C.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA; v. 141, n. 6, p. 4148-4154, JUN 2017.
• Citações Web of Science: 8

Resumo

Levitation and manipulation of objects by sound waves have a wide range of applications in chemistry, biology, material sciences, and engineering. However, the current acoustic levitation techniques are mainly restricted to particles that are much smaller than the acoustic wavelength. In this work, it is shown that acoustic standing waves can be employed to stably levitate an object much larger than the acoustic wavelength in air. The levitation of a large slightly curved object weighting 2.3 g is demonstrated by using a device formed by two 25 kHz ultrasonic Langevin transducers connected to an aluminum plate. The sound wave emitted by the device provides a vertical acoustic radiation force to counteract gravity and a lateral restoring force that ensure horizontal stability to the levitated object. In order to understand the levitation stability, a numerical model based on the finite element method is used to determine the acoustic radiation force that acts on the object. (C) 2017 Acoustical Society of America. (AU)

• Processo FAPESP: 15/08919-9 - Estudo numérico e experimental da levitação acústica de campo próximo
• Beneficiário: Fábio Takeshi Asakura Okina
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 14/24159-1 - Manipulação sem contato de partículas utilizando ultrassom
• Beneficiário: Marco Aurélio Brizzotti Andrade
• Modalidade de apoio: Auxílio à Pesquisa - Regular