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http://dx.doi.org/10.5050/KSNVN.2004.14.5.432

Acoustic Levitation and Rotation Produced by Ultrasonic Flexural Vibration  

Loh, Byoung-Gook (Department of Mechanical Systems Engineering, Hansung University)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.14, no.5, 2004 , pp. 432-438 More about this Journal
Abstract
Acoustic levitation induced by ultrasonic flexural vibration at 28.4 KHz with a vibration amplitude of 10 micrometers is presented. Levitation of multiple objects along the length of the beam in a gap of 8.3 mm which is the half of acoustic wavelength is experimentally demonstrated. Analytical analysis predicts that levitated objects for the gap of half-the wavelength converges to the center of the gap, which is experimentally verified. It is observed that levitated objects with well-balanced mass distribution are set into rotation due to acoustic streaming. For cylinder-shaped Styrofoam with a diameter of 1.8 mm and a length of 3 mm, measured rotational velocity is 2400 revolution per minute. Applications of standing wave field levitation (SWFL) include manipulation of biological cells and blood constituents in biotechnology, and fine powder in material engineering.
Keywords
Acoustic Levitation; Ultrasonic Vibration; Acoustic Resonance; Acoustic Streaming;
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