Ultrasonic Air Atomising Nozzles
Ultrasonic atomisers operate on a very sophisticated process which is based on two steps: In the first one tiny water jets are injected into an high speed air flow which provides a first break up and atomisation of the fluid.
In the second step the two phase flow, air entraining liquid droplets, goes trough a field of sound waves which produce a further break up and a lower droplet dimension. This is realised through an impact between the two phase flow and a resonator located in front of the nozzle orifice.
Ultrasonic atomisers can only be manufactured with high precision machining operations but offer the following remarkable advantages.
A. The droplets in the atomised jet show low values for the Sauter Mean Diameter, and in addition a rather narrow range of individual droplet diameter: in other words the drops are very small and with little difference in diameter between the smallest and the biggest droplet. This means the spray is made by droplets very small and very similar in size, which is very important in all evaporative processes like for example air humidification: it is rather easy then to obtain values for the evaporation time and evaporation length of a given spray.
B. The noticeable variations in local air pressure all around the resonator, associated to the sound waves, eliminate the danger of dust and foreign particles build-up in the vicinity of the nozzle orifice, thus avoiding a decay in the atomiser performance.
The system will then be very reliable and require limited or null maintenance.
To find out more about the use of ultrasonic nozzles for dust suppression, please click on the following link:
The Use of Ultrasonic Nozzles for Dust Suppression
Atomisers and Fittings
Ultrasonic atomisers produce the finest sprays available with air assistance for industrial processes, with a narrow angle full come jet. Water and air do not mix in a confined volume before leaving the nozzle and therefore their feed pressures can be adjusted independently without influencing each other: this allows for a very wide regulation range on the liquid capacity and makes it easier to reach the desired operating conditions.
Please note that the code given in the table only refers to the atomising head and must be completed with the identification for one of the four connection adapters available (refer to Data Sheet below). The drawing on it shows an atomising head assembled onto one A type adapter.
For more technical information regarding the MA Series Ultrasonic Atomiser, please click on the following link:
MA Series Ultrasonic Nozzle Operation