论文信息 - Controlled rotation of sound-trapped small particles by an acoustic needle

Controlled rotation of sound-trapped small particles by an acoustic needle

We show that an acoustic needle, mechanically driven by an ultrasonic transducer in air, can rotate sound-trapped small particles around its tip in water. The rotation is very stable when sound field around the tip is appropriate. For an acoustic needle at a given location in a sound field, the revolution speed of trapped particles can be controlled by the acoustic pressure near the tip or by driving voltage and frequency of the ultrasonic transducer. For Flying Color seeds, a revolution speed larger than 300rpm can be obtained.

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