title: Multibubble sonoluminescence enhancement by fluid flow.
abstract: Forced fluid flow can cause the enhancement of multibubble sonoluminescence (SL) under suitable conditions. The effect of directional flow with a circulator is similar to that of rotating flow with a stirrer. The mechanism of the enhancement is that both flows prevent cavitation bubbles from coalescing and clustering, which are responsible for the quenching of SL. The intensity of sonochemiluminescence (SCL) in an aqueous luminol solution increases with flow speed at higher ultrasonic powers more significantly than that of SL in distilled water. However, in the range of low ultrasonic power, the intensities of SL and SCL decrease with flow speed. Therefore, an optimum flow speed exists in relation to ultrasonic power and frequency.
authors.affiliation: Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofugaoka, Chofu, Tokyo, Japan. hatanaka@pc.uec.ac.jp <hatanaka@pc.uec.ac.jp>
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Hatanaka
authors.forename: Hideto
authors.initials: H
authors.lastname: Mitome
authors.forename: Kyuichi
authors.initials: K
authors.lastname: Yasui
authors.forename: Shigeo
authors.initials: S
authors.lastname: Hayashi