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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental investigation of the particle oscillation instability in a single-axis acoustic levitator

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Author(s):
Andrade, Marco A. B. [1] ; Polychronopoulos, Spyros [2] ; Memoli, Gianluca [3] ; Marzo, Asier [4]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo - Brazil
[2] Univ Athens, Informat & Telecommun, Athens 15784 - Greece
[3] Univ Sussex, Sch Engn & Informat, Brighton BN1 9RH, E Sussex - England
[4] Univ Publ Navarra, Comp Sci, Pamplona 31006, Navarre - Spain
Total Affiliations: 4
Document type: Journal article
Source: AIP ADVANCES; v. 9, n. 3 MAR 2019.
Web of Science Citations: 3
Abstract

Single-axis acoustic levitators are employed in biomedicine, chemistry and physics experiments due to their ability to trap in mid-air objects of a wide range of materials and sizes. Although this type of levitator has been studied for decades, there are effects that are not well understood. One of these effects is the particle oscillation instability, in which the levitating particle starts to oscillate with increasing amplitude until it is ejected out of the levitator. Most of the operations performed with acoustic levitation require high accuracy regarding the positioning of the particle, thus a lack of stability severely hinders the experiments. In this paper, we present an experimental setup that consists of a single-axis levitator, a mechanized stage to control the separation between the emitter and the reflector, a scale to measure the radiation force and a high-speed camera. We experimentally investigate the effect of the distance between the emitter and the reflector on the apparatus resonant frequency and on levitation stability. In accordance with previous theoretical studies, three types of levitation behavior were experimentally identified: stable levitation, oscillation of constant amplitude and unstable oscillation. We also show that the type of levitation behavior can be controlled by changing the distance between the emitter and the reflector. (C) 2019 Author(s). (AU)

FAPESP's process: 17/27078-0 - Development of acoustic levitation systems
Grantee:Marco Aurélio Brizzotti Andrade
Support Opportunities: Regular Research Grants