Acoustic levitation of large objects in air

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

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Abstract

Sound waves can be used to levitate solid particles and liquid drops in air. However, most acoustic levitation methods are only capable of levitating objects considerably smaller than the acoustic wavelength. In this paper, we present an acoustic method to levitate objects much larger than the acoustic wavelength. In this method, a large object is suspended in air by producing an acoustic standing wave between a set of ultrasonic transducers and the object. To demonstrate this levitation method, a sphere of 50 mm in diameter is suspended in air by three 25 kHz transducers arranged in a tripod fashion and a slightly curved object is acoustically levitated by using a single transducer operat-ing at 24.57 kHz. The acoustic levitation of large objects is simulated by using the Fi-nite Element Method to calculate the acoustic pressure and velocity fields around the object. From these fields, the acoustic radiation pressure is calculated and the vertical and horizontal forces that act on the object are determined by numerically integrating the radiation pressure over the surface of the objects.

Original languageEnglish
Publication statusPublished - 2017
Event24th International Congress on Sound and Vibration: London Calling - Park Plaza Westminster Bridge Hotel, London, United Kingdom
Duration: 23 Jul 201727 Jul 2017
Conference number: 24
http://www.icsv24.org/

Conference

Conference24th International Congress on Sound and Vibration
Abbreviated titleICSV24
CountryUnited Kingdom
CityLondon
Period23/07/1727/07/17
Internet address

Keywords

  • Acoustic levitation
  • Acoustic radiation force
  • Finite element method

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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