Air Water Atomising Nozzles: Advanced Technology for Longer Range Fine Spray Generation.
Water atomisation is a process widely used in various industrial, agricultural and environmental applications to control humidity, temperature, dust, odour control, pollution and other adverse conditions. One of the most advanced and efficient technologies in this field is the air-atomising water nozzle, which combines compressed air and water to generate ultra-fine aerosols that can be easily dispersed and controlled. In this article, we will explore in detail the theory, design and applications of water-air atomising nozzles.
Air Water Atomisation Fundamentals
Water atomisation is a process in which a liquid, in this case water, is broken down into small particles, called aerosols. Air atomisation uses a gas, usually compressed air, to assist in this process. The combination of air and water in the atomisation nozzle allows for better distribution and control of the aerosol particle size.
The basic principle of air water atomisation is based on the interaction between two fluids: compressed air and water. These two fluids are mixed in a specially designed mixing chamber, where the kinetic energy of the compressed air is transferred to the water, which is broken down into fine particles. The result is a very fine, homogeneous spray, which can be adjusted in size and flow according to the specific needs of the application.
How they are installed:
With pressure systems
Both water and air are injected into the nozzle with pressure systems – by means of valves and pressure adjusters (see diagram).
By means of a siphon system
The liquid is added by gravity or siphon (see diagram).
Design and Types of Air Water Atomiser Nozzles
The design and construction of water-air atomising nozzles are crucial to ensure efficient and effective atomisation. There are several types and designs of atomising nozzles, including:
Impact nozzles use the kinetic energy of compressed air and water to generate fine aerosols. The compressed air is injected into the mixing chamber through a small orifice and collides with the water, causing it to break down into fine particles. The particle size distribution in this type of nozzle can be adjusted by varying the air and water pressure.
Two-fluid nozzles use a coaxial injection design, where the compressed air and water are introduced into the mixing chamber through separate orifices. The compressed air surrounds the water jet, accelerating it and breaking it down into fine particles. This design allows for better particle size control and more efficient atomisation.
Rotating Spray Nozzles
Rotary spray nozzles use a rotating disc to break up the water into fine particles. Compressed air and water are mixed in the mixing chamber and ejected through small holes in the rotating disc. The rotation of the disc disperses the water into fine, homogeneous particles, creating a uniform spray.
Applications for Air Water Atomising Nozzles
Water atomising nozzles with air have a wide variety of applications in different sectors, including:
In agriculture, water-air atomising nozzles are used for the precise application of pesticides, fungicides and liquid fertilisers. The fine, uniform atomisation ensures proper and efficient coverage of plants, reducing the amount of chemicals needed and minimising environmental impact.
In industry, these nozzles are used in cooling, humidification and dust control processes. The ability to generate fine aerosols allows precise control of temperature and humidity in industrial environments, improving product quality and worker safety. They are also widely used for coating application.
Air Contamination Control
Air water atomising nozzles are a useful tool for controlling air pollution in a variety of applications, from dust suppression to odour removal and gas cleaning. These nozzles work by atomising liquids into fine particles, which mix with air to create a mist that can be used to control air pollution in a wide range of environments.