Directional transport and random motion of particles in ALF ultrasonic cavitation structure

Abstract

Highlights Directional transport and random motion of particles in ALF ultrasonic cavitation structure are investigated. Particles tend to transport along the bubble chain repeatedly and predictably. The motion of particles is related to the cavitation bubbles attached to the particles.

Dynamics of double bubbles under the driving of burst ultrasound

“…The gas nuclei in liquids will grow to be visible bubbles under the driving of ultrasound with enough acoustic pressure. This phenomenon is called ultrasonic cavitation [1] , [2] , [3] . Pulsation of bubbles will generate high temperature and pressure therein.…”

Continuous motion of particles attached to cavitation bubbles

“…It is found in experiments that particles attached to bubbles will move in various ways, such as ejection, collision, translation, rotation, attitude variation and circular motion, et al Ejection and collision occur between two particles attached to bubbles, which has been discussed in another paper published by the authors [50] . Translation, rotation, attitude variation and circular motion of particles are driven by cavitation bubbles, which is discussed in this paper.…”

Interactions of bubbles in acoustic Lichtenberg figure

“…This study highlights the self-organization of bubbles in a cavitation field. Many factors modifying the distributing structure of bubbles can be controlled to travel along the transportation paths of the bubble [28] . Therefore, the efficiency of energy utilization can be enhanced by manipulating the cavitation bubbles.…”

“…The relative motion between bubbles is poorly described, and the secondary Bjerknes force between bubbles is not considered in the continuum model. Secondary Bjerknes forces play an essential role in the self-organization of bubble populations [26] , [27] , and the movement of bubbles is closely related to the transport of substances in liquids [28] . Therefore, it is crucial to consider the secondary Bjerknes forces between bubbles and to analyze the movement of bubbles in bubble populations.…”