The main factors that will affect the strength of ultrasonic crushing equipment are simply divided into ultrasonic frequency, surface tension and viscosity coefficient of liquid, liquid temperature and cavitation threshold, which need to be paid attention to. For details, please refer to the following:

1. Ultrasonic frequency

The lower the ultrasonic frequency, the easier it is to produce cavitation in the liquid. In other words, to cause cavitation, the higher the frequency, the greater the sound intensity required. For example, to generate cavitation in water, the power required for ultrasonic frequency at 400kHz is 10 times greater than that at 10kHz, that is, cavitation decreases with the increase of frequency. Generally, the frequency range is 20 ~ 40KHz.

2. Surface tension and viscosity coefficient of liquid

The greater the surface tension of the liquid, the higher the cavitation intensity, and the less prone to cavitation. The liquid with large viscosity coefficient is difficult to produce cavitation bubbles, and the loss in the propagation process is also large, so it is also not easy to produce cavitation.

3. Temperature of liquid

The higher the liquid temperature is, the more favorable it is for the generation of cavitation. However, when the temperature is too high, the vapor pressure in the bubble increases. Therefore, when the bubble is closed, the buffer effect is enhanced and the cavitation is weakened.

4. Cavitation threshold

Cavitation threshold is the low sound intensity or sound pressure amplitude that causes cavitation in liquid medium. Negative pressure can occur only when the alternating sound pressure amplitude is greater than the static pressure. Only when the negative pressure exceeds the viscosity of the liquid medium will cavitation occur.

The cavitation threshold varies with different liquid media. For the same liquid medium, the cavitation threshold varies with different temperature, pressure, radius of cavitation core and gas content. Generally speaking, the lower the gas content of liquid medium, the higher the cavitation threshold. The cavitation threshold is also related to the viscosity of liquid medium. The greater the viscosity of liquid medium, the higher the cavitation threshold.

The cavitation threshold is closely related to the frequency of ultrasound. The higher the frequency of ultrasound, the higher the cavitation threshold. The higher the frequency of ultrasonic, the more difficult it is to cavitation. In order to produce cavitation, we must increase the strength of ultrasonic crushing equipment.