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Numerical and experimental investigation of the stability of a drop in a single-axis acoustic levitator

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Andrade, Marco A. B. [1] ; Marzo, Asier [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Phys, BR-0550090 Sao Paulo - Brazil
[2] Univ Publ Navarra, Comp Sci, Pamplona 31006, Navarre - Spain
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Physics of Fluids; v. 31, n. 11 NOV 2019.
Citações Web of Science: 0

Acoustic levitation can be employed to hold liquid drops in midair, enabling novel applications in X-ray scattering of proteins, amorphous crystallization of solutions, or contactless mixing. Multiple studies have characterized the physical behavior of a levitated drop inside an acoustic field. Here, we present a numerical and experimental study on the acoustic levitation of water drops in a single-axis acoustic levitator consisting of an ultrasonic transducer and an opposing reflector. Instead of modeling an abstract incident acoustic field, our model considers the shape of the drop as well as the real geometry of the levitator. We also use a high-speed camera to observe the disintegration and the undesired oscillations of the drops. Our results show that the insertion of a drop in the levitator provokes a shift in its resonant frequency that depends on the shape of the drop. Second, the levitation behavior depends on whether the levitator operates slightly below or above the resonance. Third, if the levitator is driven above the resonant frequency, it is possible to levitate with more strength and avoid disintegration of the drop. This research provides an insight on how to achieve more stable experiments that avoid the bursting and undesired oscillations of the levitated sample. We hope that it will facilitate numerous experiments involving acoustically levitated liquid drops. Publishedunder license by AIP Publishing. (AU)

Processo FAPESP: 17/27078-0 - Desenvolvimento de sistemas de levitação acústica
Beneficiário:Marco Aurélio Brizzotti Andrade
Linha de fomento: Auxílio à Pesquisa - Regular