11. スクイーズ膜効果による安定キャビテーション場の形成とその応用

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Mechanical or chemical effects obtained through the ultrasonic cavitation phenomenon have been applied to many industrial fields. Those effects are induced by vibration or cllapse of microbubbles in liquids. In order to obtain efficient cavitation effects, it is necessary to generate pressure larger than the cavitation threshold. In general, standing wave fields are utilized for generating the cavitation. In standing wave fields, however, cavitating bobbles are mainly located at the loops of the pressure, that causes the spatial ununiformity of cavitational effects. Moreover, the microbubbles in liquids and the free reflectional surfaces of liquids disturb the standing wave fields and prevent keeping stable cavitational fields. In this study, we propose generating the cavitation by using the squeeze-film effect which is a phenomenon that large pressure is produced into the thin liquid film between two surfaces when the surfaces approch rapidly each other. With the effect, cavitational fields can be obtained two features; spatial uniformity and temporal stabilization. The former property is due to almost uniform pressure distribution and the latter is because the change in acoustical load caused by cavitating bubbles less affects the sound field with the squeeze-film effect than ordinary standing wave field. We this time demonstrate a water treatment system utilizing the squeeze-film effect. In preliminary experiments, inactivation of cryptosporidium oosysts in water was achieved with the system.
日本ソノケミストリー学会の論文

11. スクイーズ膜効果による安定キャビテーション場の形成とその応用

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