Optical Observation of Two Collapsing Bubbles Adhering to A Quartz Wall
The collapse behavior of two bubbles adhering to quartz glass was optically observed to examine the influences of an interactive force called the secondary Bjerknes force on the collapse behavior of bubbles. It was demonstrated that the interactive force deformed bubbles asymmetrically. These deformations induced flow generation and splits of the bubble. Additionally, it was experimentally confirmed that the interactive force acted as an attractive force or a repulsive force. The deformation process of bubbles largely depended on whether an attractive force acted or a repulsive force acted. Moreover, both conditions of an attractive force acting and a repulsive force acting were examined. It was shown that an attractive force acted when the initial radii of two bubbles were larger or smaller than the resonant radius of a free bubble. When one initial radius of the two bubbles was smaller than the resonant radius and the other was larger, a repulsive force acted.
Key wordsUltrasound Micro bubble Asymmetrical collapse Optical observation
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