New approach for quantitative measurement of ultrasonic cavitation yields.

In this study, we propose the use of the bubble cloud ellipsoid volume as the quantitative evaluation parameter to monitor the ultrasonic cavitation yield. The bubble cloud ellipsoid volume was calculated by using the bubble cloud image and attenuation characteristics in bubble cloud. The usefulness of this parameter was verified by observing the change in the bubble cloud under various conditions. Under all sonication conditions, the bubble cloud volume was increased in proportion to the rise in sonication intensity (R(2): 0.9283, 0.8817, and 0.9439). On the basis of these results, we consider that the bubble cloud ellipsoid volume is a very useful evaluation parameter for quantitatively assessing the cavitation yield. Furthermore, this new approach may form the foundation of future studies on cavitation applications.