Abstract
Based on the acoustic levitation phenomenon, we have proposed and developed an acoustic levitation system to classify fine particles. First described the theoretical analysis of levitation force generated in a standing wave field. A simulation is then performed to work-out the wave amplitude required to levitate the polystyrene and polypropylene. Based on those results, we have developed the system which consists of a transducer (PZT), a reflector (an aluminum plate), an amplifier and a function generator, and tested the acoustic levitation phenomenon of polystyrene and polypropylene in a cylindrical tube. It is found that the relation between the particle size and the power of the acoustic field (wave amplitude) was in fair agreed with the prediction by modified Gor'Kov's theorem. However, the current theory is not perfect enough to explain the results in case of the size of particle less than 1.0 mm.
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