What are the factors that affect ultrasonic atomization spraying
Ultrasonic atomization spraying is different from traditional atomization spraying. Traditional spraying relies on pressure and high-speed motion to shear the fluid into small droplets. Ultrasonic spraying uses only ultrasonic vibration energy for atomization. Ultrasonic atomization spray equipment is regarded as a "green" technology due to its low energy consumption and high efficiency, and is an ideal choice for key fluid applications.
Ultrasonic atomization spray system, also known as ultrasonic atomizer or ultrasonic spray nozzle, ultrasonic vibration produces high oscillations, which can produce extremely fine droplets, also known as "dry mist". In the ultrasonic spraying process, the droplet size and distribution can be accurately controlled, so that very small droplet particles can quickly evaporate, thereby producing particles with a high specific surface area.
Ultrasonic atomization spraying uses piezoelectric effect to convert electrical energy into high-frequency mechanical energy to atomize liquid.
Ultrasonic high-frequency oscillation is used to atomize the liquid into uniform micron-sized particles. Compared with traditional pressure nozzles, ultrasonic spraying can obtain a more uniform, thinner and more controllable film coating, and it is not easy to block the nozzles. Because the ultrasonic nozzle only needs a tiny air volume of kilopascals, and there is almost no splash during the spraying process, the paint utilization rate is as high as 90%.
What are the factors that affect ultrasonic atomization spraying:
1. Droplet size
The frequency of the ultrasonic spraying equipment affects the size of the droplets, the higher the frequency, the smaller the droplet size. The median droplet size at 20kHz was 90 microns, and at 40kHz, the droplet size was further reduced to an average of 45 microns.
2. Atomization success or failure
If the ultrasonic energy is too high, cavitation will occur, and too high energy will not form an ideal film on the tip of the nozzle, causing the liquid flowing through the nozzle to be prematurely atomized and "tear" into droplets of different sizes. Only the amplitude generated under a certain power can produce a more ideal atomization effect. For ultrasonic atomization spraying, the input power level is generally about 10 to 15 watts.
3. Atomization flow
The flow range of ultrasonic atomizing nozzles is generally relatively large, unlike traditional air-driven nozzles that need to rely on the power of air to break down the liquid stream for atomization. Therefore, the amount of liquid atomized by the nozzle per unit time of the same solution is mainly controlled by the liquid delivery system used in combination with the atomizing nozzle.
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