Cavitation is the transmission of ultrasonic wave to liquid by high frequency transformation of compression force and pressure reduction interaction over 20,000 times per second. Vacuum nucleus bubbles are produced in the liquid under pressure reducing action. When the vacuum nucleus bubbles are crushed under pressure, they produce strong impact force, and thus peel off the dirt on the surface of the cleaned products, so as to achieve the purpose of precise cleaning.
In the process of ultrasonic cleaning, the bubbles visible to the naked eye are not vacuum nucleus bubbles, but air bubbles, which inhibit cavitation and reduce cleaning efficiency. Only when the air bubbles in the liquid are completely removed, the cavitation of the vaccum nuclei can achieve the best effect.
Straight forward flow
The phenomenon of ultrasonic flowing in the liquid along the direction of sound propagation is called direct flow. When the intensity of sound wave is 0.5W/cm2, the direct flow can be seen with the naked eye, and the flow occurs perpendicular to the vibration surface. The flow velocity is about 10cm/s. Through this direct inlet, the micro-oil dirt on the surface of the cleaned product is stirred, and the cleaning liquid on the dirt surface also produces convection. The solution of the dissolved dirt is mixed with the new liquid, which speeds up the dissolution and plays a great role in the transportation of the dirt.
Acceleration produced by liquid particles. For the high frequency ultrasonic cleaning machine, cavitation effect is not significant, at this time the cleaning mainly depends on the acceleration of liquid particles under ultrasonic impact particles on the dirt for ultra-precision cleaning.