When the ultrasonic wave is introduced into the solution, the alternating pressure will be generated. When the acoustic wave for cavitation threshold propagates in the liquid, cavitation bubbles can be generated and the mass transfer rate of gas from the solution to the bubbles can be significantly improved. Cavitation bubbles are generated by tiny gas nuclei in the solution, and these bubbles will be generated due to the action of tensile stress (negative pressure) in the sparse phase of the acoustic wave. If the tensile stress continues to exist after the formation of the cavitation bubble, the cavitation bubble will expand to many times the initial size. In this case, the cavitation bubble maintains a spherical structure, and then continuously grows, vibrates and collapses. Under the action of ultrasound, the gas components in the solution can enter the cavitation bubble through the gas-liquid interface "directional diffusion", and the cavitation bubble enters the growth stage. When the cavitation bubble collapses on the surface of the solution, the gas will escape from the bubble, which causes degassing.

脱气超声波清洗机

Degassing ultrasonic cleaning machine

超声波脱气设备优点，泡沫为气泡的大量聚集，超声波脱气气设备是在泡沫生成前期、气泡未大量聚集前对液体进行消泡、脱气，或是对溶解、混合在液体内的气体进行消泡、脱气。整个过程不使用任何消泡剂，是完全的物理消泡方式，也可称作机械消泡方式。对于已经生成的表面泡沫，该设备作用不明显，需要配合消泡膜方式共同加以。

Advantages of ultrasonic degassing equipment: foam is a large number of bubbles. Ultrasonic degassing equipment is used to defoaming and degassing the liquid at the early stage of foam generation and before the bubbles are accumulated in large numbers, or to defoaming and degassing the gas dissolved and mixed in the liquid. The whole process does not use any defoamer. It is a complete physical defoamer, also known as mechanical defoamer. For the surface foam that has been generated, the effect of this equipment is not obvious, and it needs to be solved together with defoaming film.

脱气主要运用的是超声的“定向扩散”，一旦产生空化，内部还是有空气，在一些熔融液脱气纯化应用中以不产生空化更佳。液体的空气排掉，减少超声波空化反应产生的气泡的阻力，增强超声波清洗机的清洗效率。还有一种作用是超声波清洗机工作时间久了会产生一种超声波疲劳，减低清洗效果和效率，排氧脱气功能还可以这种超声波疲劳。

Ultrasonic "directional diffusion" is mainly used for degassing. Once cavitation occurs, there is still air inside. In some degassing and purification applications of molten liquid, it is better not to generate cavitation. The air of the liquid is discharged to reduce the resistance of the bubbles generated by the ultrasonic cavitation reaction and enhance the cleaning efficiency of the ultrasonic cleaner. Another function is that the ultrasonic cleaning machine will produce ultrasonic fatigue after working for a long time, reducing the cleaning effect and efficiency. The oxygen exhaust and degassing function can also eliminate this ultrasonic fatigue.

综上，可以看出超声波清洗设备的脱气功能是非常强大的，能更好的达到清洗目的，提高清洗效果。

In conclusion, it can be seen that the degassing function of the ultrasonic cleaning equipment is very powerful, which can better achieve the cleaning purpose and improve the cleaning effect.

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