Abstract
Attractive force or repulsive force acts on solid objects facing an ultrasonically vibrating horn in liquid. Severe cavitation damage is observed on the surface of an aluminum plate adhereing to an ultrasonically vibrating horn in water. To elucidate the mechanisms of the generation of force acting on a solid object in a near ultrasonic field in water, the behavior of cavitation bubbles on the surfaces of an ultrasonically vibrating horn and a solid object was investigated. From the results of in situ observation, it was clarified that the force acting on a solid object is controlled by bubble generation and collapse.
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