Visualization of Acoustically Induced Cavitation Bubbles and Microjets with the Aid of a High-Speed Camera

概要

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Under ultrasonic irradiation at a frequency of approximately 42 kHz, model experiments in water have been performed to visualize the dynamic behavior of acoustic cavitation bubbles with a high-speed digital camera. The clustered cavitation multibubble moves linearly in random directions. The behavior of the clustered cavitation multibubble is discussed in relation to the behavior of a microjet as well as the phase transition of water between a normal liquid state and a supercritical fluid state. Another experiment has also been carried out to visualize microjets that appeared near a water/tetralin interface and a water/air interface. The behavior of clustered cavitation multibubble is accompanied by the microjets, and the microjets impinge strongly impinging on those interfaces. On the basis of these experimental results, one can conclude that the behavior of microjets and acoustic cavitation bubbles and their related phenomena are quite important for the understanding and control of the intensified macro- and micromixing of liquids.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-06-15