An ultrasonic nozzle is a type of spray nozzle that uses high-frequency vibration generated by a piezoelectric transducer that acts on the tip of the nozzle to generate surface tension waves in the liquid film. A spray nozzle is a precision device that facilitates the distribution of liquid in a spray. Nozzles are used for three purposes: spreading a liquid over an area, increasing the surface area of the liquid, and creating an impact force on a solid surface. This is the simplest type of nozzle, which has an orifice in the chamber where the liquid to be sprayed is supplied under pressure. uiltrasonic spraying
The spray is generated from the orifice in spray pattern, flow rate and spray angle, depending on the edge profile of the orifice and the design of the internal pressure chamber. An ultrasonic nozzle is a type of spray nozzle that uses high-frequency vibration generated by a piezoelectric transducer that acts on the tip of the nozzle to generate surface tension waves in the liquid film. When the amplitude of the surface tension wave reaches a critical level (due to the power supplied by the generator), the surface tension wave becomes too large to support itself and small droplets fall from the top of each wave. And cause spraying.
The main factors that affect the size of the initial droplets produced are vibration frequency, surface tension, and liquid viscosity. Frequencies are typically in the range 20-180 kHz, outside the human audible range that produces the smallest droplet size with the highest frequency. Studies have shown that ultrasonic nozzles can be used effectively to produce proton exchange membrane fuel cells. The commonly used ink is a platinum-carbon suspension, which acts as a catalyst in the cell. Conventional methods of applying a catalyst to a proton exchange membrane usually involve screen printing or a doctor blade. However, these methods can lead to undesired cell performance as the catalyst tends to form aggregates, resulting in a non-uniform gas flow within the cell and preventing the catalyst from being completely exposed. Read more...