Abstract
The flow pattern in a channel by ultrasonic vibration has been investigated as a basic research into non-contact fluid control. An ultrasonic transducer is fixed to the center of the bottom of a square test channel, and a standing wave field is formed in this channel. By applying ultrasonic vibration into the flow, cavitation bubbles are generated at the sound pressure antinode in the channel when Re=2000. Consequently, cavitation bubbles act on the fluid as a barrier causing a separation in the flow and the velocity is reduced locally.
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