What Is Ultrasonic Atomization?

What is ultrasonic atomization?

Ultrasonic atomizers, compared to traditional atomizing nozzles, are quite good, and they are more environmentally friendly and convenient to use.

The atomizer uses high-frequency sound waves (beyond the range of human sound perception) to produce atomization. The disc-shaped piezoelectric ceramic transducer receives the high-frequency electric energy from the broadband ultrasonic generator and converts it into vibrating mechanical motion of the same frequency. The two titanium cylinders coupled with the transducer will mechanically vibrate Enhanced. The shock formed by the transducer generates a continuous sound wave along the length of the nozzle. The amplitude of the sound wave is the largest when it reaches the atomization surface, which is the small diameter part located at the forefront of the nozzle. Generally speaking, high-frequency nozzles are smaller in size and produce smaller droplets, while lower-frequency nozzles have a lower flow rate. The liquid is introduced to the atomizing surface through a large, non-blocking channel over the entire length of the nozzle. The liquid appearing on the atomizing surface absorbs the vibration energy and is therefore atomized.

The typical nozzle body is made of titanium material because of its outstanding acoustic properties, high tensile strength and excellent corrosion resistance. The protective shell is made of 316 stainless steel (titanium can also be selected).

The level of input energy is used to distinguish between ultrasonic nozzles and other ultrasonic equipment, such as ultrasonic welding machines, ultrasonic emulsifiers and ultrasonic cleaning machines. The working power of those ultrasonic equipment is usually several hundred or several kilowatts, but for ultrasonic atomization, the input power level is generally from 1 to 15 watts.

Atomized spraying is the use of piezoelectric effect to convert electrical energy into high-frequency mechanical energy, thereby atomizing liquid. Ultrasonic high-frequency oscillation is used to atomize 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. Since the ultrasonic nozzle only needs a tiny air volume of kilopascals, there is almost no splash during the spraying process, so the paint utilization rate is as high as 90%.

Atomized spraying is a successful technique, such as applying high-performance and high-quality thin coatings to substrates. Through the precise control of the various process parameters of ultrasonic atomization, overspray is avoided and precise droplet distribution is achieved. The advantage of ultrasonic atomization is that it can completely control the droplet size, spray intensity and droplet velocity. Industrial ultrasonic atomizer can be easily changed. Ultrasonic spray drying is a very effective non-heat treatment technology. Due to its mildness, it is very effective for heat-sensitive materials.