Acoustic Cavitation and Bubble Dynamics.
MISSISSIPPI UNIV UNIVERSITY PHYSICAL ACOUSTICS RESEARCH LAB
Pagination or Media Count:
The topic of this chapter, acoustic cavitation, is but one of several possible mechanisms through which ultrasound can interact with a liquid medium. Acoustic cavitation can affect a liquid through two possible avenues. The first is the bubble itself. The liquid is disrupted by the inhomogeneous presence of the bubble. The second avenue through which bubbles affect a fluid is through bubble dynamics. The bubbles interior and the liquid immediately surrounding the bubble are regions which undergo continual change. The bubble-liquid interface continually changes shape and size liquid molecules diffuse into and out of the bubble the concentration of gas in the surrounding liquid varies acoustic streaming occurs in the liquid in the vicinity of the bubble often resulting in severe shear stresses the interior pressure and temperature fluctuate rapidly the bubble radiates acoustic energy as it oscillates thermal and viscous damping hinder the bubble oscillations.