Many of them are used in ultrasonic cleaning equipment. What are the principles and functions of this? Here's the answer:
When the ultrasonic wave enters the solution, it will produce alternating pressure. The acoustic wave used for cavitation threshold will produce cavitation bubbles when it propagates in liquid, which can significantly improve the mass transfer rate of gas from solution to bubbles. Cavitation bubbles are generated by tiny gas nuclei in the solution, which are generated by the tensile stress (negative pressure) of the dilute phase of sound wave.
If the tensile stress still exists after cavitation, the bubble will expand to many times of its initial size. In this case, cavitation bubbles remain spherical, then grow, vibrate and collapse. When the ultrasonic wave is applied, the gas components in the solution can enter the cavitation bubble through the "directional diffusion" of the gas-liquid interface, and the cavitation bubble enters the human growth stage. When the cavitation bubble collapses on the surface of the solution, the gas will escape from the bubble and cause degassing.
The advantage of the ultrasonic degassing equipment is that the bubbles are gathered by a large number of bubbles. The ultrasonic degassing equipment is in the early stage of the bubble formation. The bubbles are not a large number of accumulated liquid defoaming, degassing, or dissolving, and are mixed in liquid gas to defoaming and degassing. The whole process does not use any defoamer, it is physical defoaming, also can be called mechanical defoaming. For the surface foam that has been produced, the device has no obvious effect and needs to be solved by the antifoaming film.
Ultrasonic directional diffusion is mainly used in degassing. Once cavitation occurs, there is still air inside, which will not produce cavitation in degassing purification of some molten liquids. Discharge liquid air, reduce the resistance of bubble generated by ultrasonic cavitation reaction, improve the cleaning efficiency of ultrasonic cleaning machine. Another effect is that the ultrasonic cleaning machine will produce a kind of ultrasonic fatigue when it works for a long time, which can reduce the cleaning effect and efficiency, and the oxygen exhaust Qigong can also eliminate this kind of ultrasonic fatigue.
To sum up, it can be seen that the ultrasonic cleaning equipment is very powerful, which can better achieve the purpose of cleaning and improve the cleaning effect.