Ultrasonic cleaners can also be used to clean fruits and vegetables
Ultrasonic cleaners operate at very low frequencies (within the human hearing range) and produce noise. When the frequency is lower than 20 kHz, the working noise not only becomes very large, but may exceed the noise limit specified by occupational regulations or other regulations. In applications where high power is required to remove dirt without regard to surface damage of the workpiece, lower cleaning frequencies ranging from 20 kHz to 30 kHz are typically selected. Cleaning frequencies in this frequency range are often used to clean large, heavy-duty or high-density workpieces.
Low frequencies are often used to clean smaller, more delicate parts or to remove tiny particles. High frequencies are also used in applications where damage is not allowed on the surface of the workpiece. The use of high frequencies improves cleaning performance in several ways. As the frequency increases, the number of cavitation bubbles increases linearly, producing more denser shock waves that allow them to enter smaller gaps. If the power remains constant, the cavitation bubbles become smaller and the energy released is correspondingly reduced, thus effectively reducing damage to the surface of the workpiece. Another advantage of high frequency is the reduced viscous boundary layer
Ultrasonic cleaning machines are widely used in surface coating processing industry, machinery industry, electronics industry, medical industry, semiconductor industry, watch and jewelry industry, optical industry, textile printing and dyeing industry. At the moment, there are also ultrasonic cleaning machines that are used in the cleaning of fruits and vegetables, and they are widely used.
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