Unlike conventional spray nozzles that rely on pressure and high velocity motion to shear a fluid into small drops, the ultrasonic spray nozzle uses only low ultrasonic vibrational energy for atomization. The liquid can be dispensed to the spray nozzle by either gravity or a small low pressure metering pump, and atomize continuously or intermittently.
Ultrasound is anoscillating sound pressure wave with a frequency greater than the upper limitof the human hearing range. Ultrasonics is theapplication of ultrasound. Ultrasound can be used for medical imaging,detection, measurement and cleaning. At higher power levels, ultrasonics isuseful for changing the chemical properties of substances.
Piezoelectricity is the electric charge thataccumulates in certain solid materials (such ascrystals, certain ceramics, andbiological matter such as bone, DNA and various proteins)in response toapplied mechanical stress.