What's Ultrasonic Cavitation?

What's Ultrasonic Cavitation?

Ultrasonic structure

Ultrasonic principle

Ultrasound interacts with the medium during propagation, changes in phase and amplitude, changes the physical, chemical, and biological properties or state of the medium, or accelerates the process of this change, resulting in a series of effects, such as mechanics, thermals. , chemical and biological effects, etc. These effects can be attributed to the following effects:

Cavitation

The cavitation bubbles grow in the negative pressure region formed by the longitudinal propagation of the ultrasonic waves, and form a bubble interface.

It is quickly closed in the positive pressure zone to be compressed and stretched under alternating positive and negative pressures.

A high-speed (110 m/s) microjet can be generated when the cavitation bubble is compressed until high-speed chipping, and the collision density is as high as 1.5 kg/m2, resulting in a high current.

The impact of the high-speed microjet on the side of the distal bubble produces a water hammer impact, ie a shock wave.

The shock wave propagates radially outward, hitting the solid surface of the sample, reflecting it to the bubble, and the bubble becomes vortex to convect the solid surface, generating a huge instantaneous pressure; this huge instantaneous pressure can make the solid particles suspended in the liquid or The surface of biological cell tissue is subject to drastic damage.