How To Choose An Ultrasonic Atomizing Nozzle With The Appropriate Frequency?

Ultrasonic atomizing nozzles utilize ultrasonic transducers to generate high-frequency mechanical vibrations, converting electrical energy into mechanical energy. This vibration is transmitted to the nozzle tip, causing the liquid to form a high-frequency oscillating liquid film on the atomizing surface. Under the influence of surface tension and vibration, the liquid is instantly dispersed into extremely fine and uniform droplets.

The entire process requires no high pressure, no compressed air, avoids nozzle clogging, produces a very gentle spray, and has no impact on the substrate, representing a mild and precise atomization method.

 

Core principles:

Higher frequency → finer, softer droplets, more suitable for precision coating.

Lower frequency → larger droplets, higher output, suitable for humidification, cooling, and coarse spraying.

 

① 20kHz–40kHz(Low frequency)

Spray droplets：20–100μm

Features: High atomization volume, strong penetration, and resistance to slightly high viscosity.

Suitable for：

o Workshop humidification, deodorization, and dust reduction

o Landscaping and artificial fog

o Simple cooling and surface wetting

Not suitable for: precision coatings, thin films, semiconductors, and pharmaceuticals.

 

② 60kHz–80kHz(Mid-to-high frequency)

Spray droplets：10–30μm

Features: Good uniformity, moderate coating amount

Suitable for：

o General functional coatings

o Spraying of adhesives, lubricants, and release agents

Ordinary thin films, medium precision coatings

 

③ 100kHz–120kHz(High frequency)

Spray droplets：1–10μm

Features: Impact-free, extremely uniform, ultra-thin coating, material-saving

Suitable for：

o Semiconductor photoresists, PCB fluxes

o Lithium-ion batteries, fuel cell catalysts

o Medical device drug coatings, stent coatings

o Nanofilms, optical coatings, perovskite photovoltaics

Item	20K	40K	100K	120K
Frequency	20 kHz	40 kHz	100 kHz	120 kHz
Droplet size	50～100 μm	20～50 μm	1～10 μm	1～5 μm
Atomization amount	Large	Medium to large	Small, fine	Extremely small, ultra-fine
Droplet impact force	Powerful	Medium	Extremely weak	Almost no impact
Applicable viscosity	Higher viscosity can be sprayed	Medium viscosity	Low viscosity, dilute solution	Extremely low viscosity
Coating uniformity	Generally	Better	Very high, ultra-thin and uniform	Extremely high, nanoscale uniformity
Material utilization rate	Low	Middle	High efficiency, very economical in terms of materials	Highest efficiency, extremely economical