Optical Observation Of A Collapsing Bubble Adhering To A Piezoelectric Transducer Surface Under Ultrasound Field
The detailed behavior of a single bubble adhering to a solid surface was optically observed using an ultra-high-speed camera (1,000,000 frames/sec) in order to clarify the mechanical effect of micro-bubbles. The changing pressure between the bubble and the surface was simultaneously observed by a thin piezoelectric transducer on the surface. When the bubble collapsed, we confirmed the radiation of a micro-jet from the bubble, which was followed by a counter jet. An impulse positive pressure applied to the surface was also observed synchronously with the collapse. This pressure seems to come from the jet flow or the violent vibration of the bubble.
Key wordsMicro-jet Micro-bubble Ultra-high-speed camera Piezoelectric transducer
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