It is well known that levitating small objects by means of acoustic waves is possible. With levitation, the use of undesired containers or holding devices can be avoided; in addition, conditions of microgravity can be obtained. Acoustic levitation has the advantage that even non-magnetic and non-conducting materials can be suspended. The work presented in this paper describes the dependence of the levitation force on the geometric parameters of a resonant cavity. In this way, a cavity with improved conditions for acoustic levitation is analysed and compared with a cylindrical one, which is commonly used. In order to identify the different resonances and to obtain the sound pressure and the particle velocity fields produced in the cavity, from where the levitation force is calculated, the Boundary Element Method (BEM) has been used. Theoretical predictions are compared with experimental results. It is shown that improved conditions for acoustic levitation can be achieved by an appropriate design of the geometry of the cavity.
|Title of host publication||Proceedings of the Twelfth International Congress on Sound and Vibration : http://www.iiav.org|
|Number of pages||8|
|Publisher||International Institute of Acoustics and Vibration|
|Publication status||Published - 2005|