Because of the bubbles generated by cavitation, the gaps and voids between the dirt layer and the surface layer formed by impact penetrate. Because of the simultaneous expansion and contraction of the small bubbles and the sound pressure, the physical force like peeling repeatedly acts on the dirt layer. The dirt layer is stripped layer by layer, and the bubbles continue to penetrate inward until the dirt layer is completely stripped. This is the secondary effect of cavitation. Impact of ultrasonic vibration of cleaning fluid on dirt in ultrasonic cleaning. Ultrasound accelerates the dissolution process of chemical cleaning agent to dirt. The combination of chemical force and physical force accelerates the cleaning process.

The action mechanism of ultrasonic cleaning mainly includes the following aspects: due to the strong shock wave generated when the cavitation bubble bursts, a part of the dirt layer is peeled off, dispersed, emulsified and peeled off under the action of the shock wave.