Ultrasound intensity refers to the ultrasonic power per unit area. Cavitation is related to the intensity of ultrasound. For general liquids, when the intensity of ultrasound increases, the cavitation intensity increases, but after reaching a certain value, the cavitation tends to be saturated. At this time, increasing the intensity of ultrasound will produce a large number of useless bubbles, thus increasing the scattering attenuation and reducing the cavitation intensity (which is what we said, when the ultrasonic power reaches a certain value, it is meaningless to increase the power).
What are the factors affecting the ultrasonic intensity of the ultrasonic cell crusher?
1. Ultrasound frequency
The lower the frequency of ultrasonic wave, the easier it is to produce cavitation in liquid. That is to say, to cause cavitation, the higher the frequency, the greater the sound intensity required. For example, in order to produce cavitation in water, the power required at 400 kHz is 10 times higher than that at 10 kHz, i.e. the cavitation decreases with the increase of frequency. Frequency range is generally 20-40 kHz.)
2. Surface Tension and Viscosity Coefficient of Liquids
The higher the surface tension of liquid is, the higher the cavitation intensity is, and the more difficult it is to produce cavitation. It is difficult for liquids with large viscous coefficients to produce cavitation bubbles, and the loss during propagation is also large, so it is also not easy to produce cavitation.
3. Temperature of liquids
The higher the liquid temperature is, the more advantageous the cavitation will be. However, when the temperature is too high, the vapor pressure in the bubble will increase, so the cushioning effect will be enhanced and the cavitation will be weakened when the bubble closes.
