Bubble Behavior in Acoustic Fields

Several types of bubbles are present in cavitating liquids. Empty cavities (true cavitation), gas-filled cavities, vapor-filled cavities or mixtures of gas and vapor can be observed. Bubbles may disappear because of dissolution of their contents under the applied sound pressure, some of them oscillate stably over several periods and others collapse violently, followed by the creation of smaller bubbles. 

To constitute the proper sound field for desired bubble behavior is the key task to achieve maximum efficiency. 

---