Quenching mechanism of multibubble sonoluminescence at excessive sound pressure
Quenching mechanism of multibubble sonoluminescence at excessive sound pressure
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DOI：
10.1143/jjap.40.3856
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发表时间：
2001-05-01
期刊：
影响因子：
--
通讯作者：
Mitome, H
中科院分区：
文献类型：
--
作者：
Hatanaka, S;Yasui, K;Mitome, H
本文研究了在超声波作用下，多泡声致发光（MBSL）的光强衰减与空化泡行为的关系。在装有六个传感器的矩形容器中测量了充气蒸馏水的MBSL强度。其中建立了驻波场。当施加到换能器的电压增加时测量。观察到空化气泡在场中分布的相应变化。利用ICCD摄像机对气泡的分布与MBSL的分布进行了比较，并利用高速摄像机对气泡的运动进行了观察。结果表明，在高超声强度下，气泡从声场压力波腹处的排出是导致MBSL强度下降的原因。驱逐是由主Bjerknes力，从吸引力的变化，根据压力振幅和气泡半径的排斥之一。通过由次级Bjerknes力引起的气泡聚结来辅助。
Decrease in luminous intensity of multibubble sonoluminescence (MBSL) at excessive ultrasonic intensity is studied in connection with the behavior of cavitation bubbles. The intensity of MBSL from aerated distilled water in a rectangular vessel with six transducers. in which a standing wave field was established. was measured while the voltage applied to the transducers was increased. The corresponding change in the distribution of cavitation bubbles in the field was observed. The distributions of bubbles were compared with those of MBSL using an intesified charge-coupled device (ICCD) camera, and the bubble motion was observed with a high-speed camera. It is clarified that the expulsion of bubbles from the pressure antinode in the field is responsible for the decrease in MBSL intensity at high ultrasonic intensity. The expulsion is caused by the primary Bjerknes force which changes from an attractive force to a repulsive one depending on pressure amplitude and bubble radius. assisted by coalescence of bubbles due to the secondary Bjerknes force.