Cavitation effect is the main factor to determine the cleaning effect, and the ultrasonic frequency directly affects the cavitation effect. Generally, the ultrasonic frequency for cavitation effect is 20khz-80khz.
The frequency is inversely proportional to the diameter of the bubble in the liquid and directly proportional to the permeability. The higher the frequency is, the shorter the wavelength is, the smaller the bubble diameter is, the lower the explosion pressure is, and the better the permeability is. In addition, the frequency should not be too high, otherwise the wavelength will be shortened, the cavitation effect will be weakened, thus reducing the cleaning efficiency.
On the contrary, the lower the ultrasonic frequency is, the easier it is to produce cavitation in the liquid, and the greater the force is, and the stronger the effect is. It is suitable for the dirt with rough surface and difficult to clean. The lower the frequency, the greater the noise. Generally, on the premise of meeting the cleaning effect, choose the higher frequency as far as possible.
Based on the above principles:
Low frequency 17k-23k: suitable for cleaning the workpiece with heavy dirt or difficult to clean, and when the impact force of bubble explosion will not cause damage to the workpiece surface, low frequency ultrasonic cleaning should be selected, such as auto parts, textile, etc.
Medium frequency 25k-28k: suitable for cleaning with heavy dirt or easy cleaning, and the impact of bubble explosion will not cause damage to the workpiece surface, medium frequency ultrasonic cleaning should be selected, such as: Hardware machinery, electroplating industry, etc.
Medium and high frequency 33k-60k: suitable for cleaning when the dirt is light or easy to clean, and the impact force of bubble explosion will not cause damage to the workpiece surface, medium and high frequency ultrasonic cleaning should be selected, such as optical glass, electronic components, etc.
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