A procedure to generate enhanced acoustic streaming into a bounded space has been studied. Under continuous ultrasound radiation, it was difficult to generate enhanced acoustic streaming in bounded space because of disturbances by reflected waves. Efforts were made to remove the disturbances by adjusting the repeat time of tone bursts of ultrasound. An experimental system has been developed for visualizing acoustic streaming. As a consequence of experiments, the streaming velocity in the bounded space has been enhanced by about 2.5 times by using a series of tone bursts of ultrasound.
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