Acoustic streaming pattern induced by longitudinal ultrasonic vibration in an open channel using particle imaging velocimetry

Acoustic streaming, which is induced in an open channel by a cylindrical exciter vibrating at 30kHz, is experimentally investigated using particle imaging velocimetry. Induced streaming pattern and velocity field for the channel gap of 18mm are presented. The symmetric distinctive steady rotational flow with local eddies is observed. The maximum streaming velocity measured stands at 0.16cm∕s with a vibration amplitude of 50μm at an excitation frequency of 30kHz.