Ultrasonic nozzle is a type of spray nozzle, which uses high-frequency vibration generated by piezoelectric transducers to act on the nozzle head, thereby generating capillary waves in the liquid film. Once the amplitude of the capillary waves reaches a critical height (due to the power level provided by the generator), they become too high to support themselves, and tiny droplets fall off the tip of each wave, causing atomization.
The main factors affecting the initial droplet size are vibration frequency, surface tension and liquid viscosity. Frequencies are typically in the 20–180 kHz range, beyond the range of human hearing, where the highest frequencies produce the smallest droplet sizes.
Subsequent uses of this technology include coating blood collection tubes, spraying flux on printed circuit boards, coating implantable drug-eluting stents and balloons/catheters, coatings for float glass manufacturing, antimicrobial coatings on food, precision semiconductors Coatings and alternative energy coatings for solar cell and fuel cell manufacturing, etc.