Ultrasonic cleaning of Ceramic Filter Membrane

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Skymen Cleaning Equipment Shenzhen CO., Ltd.

The physical mechanism of ultrasonic cleaning is mainly ultrasonic cavitation, so to achieve a good cleaning effect, appropriate acoustic parameters and physical and chemical properties of the cleaning agent must be selected.

The higher the sound intensity, the stronger the cavitation. But after the sound intensity reaches a certain value, the cavitation tends to be saturated. If the sound intensity is too high, a large number of bubbles will be generated to increase the scattering attenuation. At the same time, the increase of the sound intensity will increase the nonlinear attenuation and weaken the cleaning effect far away from the sound source.
The higher the frequency, the higher the cavitation threshold, which means that to produce acoustic cavitation, the higher the frequency, the greater the sound intensity required. For example, to produce cavitation in water, the power required at 400kHz is 10 times greater than that at 10kHz. The frequency range generally used is 20-40kHz. The low frequency has high cavitation strength, which is suitable for the occasions where the surface of large cleaning parts and the surface of the cleaning parts have high bonding strength, but it is not easy to penetrate deep holes and parts with complex surface shapes, and the noise is large; higher frequencies have higher cavitation strength Weak, but low noise, suitable for cleaning with more complex surface shapes, slits and dirt and the surface of the cleaning part. Sound field distribution. A stable reverberation field is beneficial to cleaning. If there is a standing wave sound field in the cleaning tank, the cleaning parts cannot be cleaned uniformly due to uneven sound pressure distribution. Therefore, when possible, the geometry of the groove should be chosen to be suitable for establishing a mixed sound field. In addition, dual-frequency, multi-frequency, and frequency sweeping modes can be used to avoid cleaning the "dead zone".
The temperature of the cleaning fluid. As the temperature rises, the surface tension coefficient and viscosity coefficient of the liquid will decrease, so the cavitation threshold will decrease, making cavitation easy to occur; however, due to the temperature rise, the increase in vapor pressure will reduce the cavitation intensity. The preferred temperature of water is 60 degrees Celsius, and different cleaning agents have different optimal temperatures.
Coefficient of viscosity. The liquid with a large viscosity coefficient is difficult to produce cavitation, and the transmission loss is also increased, which is not conducive to cleaning.
Vapor pressure. The vapor pressure is low, the cavitation threshold is high, and there are few cavitation bubbles, but the impact force generated when the cavitation bubbles are closed is large. On the contrary, the high vapor pressure is easy to cavitation, but the cavitation intensity decreases.
Surface Tension. The liquid has high surface tension and high cavitation strength, but it is not easy to produce cavitation.
The type of gas contained in the liquid. The greater the specific heat capacity of the gas, the higher the cavitation intensity. Therefore, it is better to use monoatomic gases such as helium, neon and argon than to use diatomic gases such as nitrogen and oxygen.
In addition, when the cleaning liquid is not flowing, it is beneficial to cavitation, but if the cleaning liquid is not filtered and circulated, the dirt will be redeposited on the surface of the cleaning part, so it needs to flow, but it should not flow too fast.