Water Atomizing Spray Nozzle Droplet Size

Nozzles with droplet sizes of 60 microns to 200 microns are good for washing and applying lubricants.

Water atomizing spray nozzle droplet size. Since it is impractical to list all produced sizes the droplet size in µm normally is specified as d32 sauter diameter. Use of two fluid nozzles. A simple rule that holds for all nozzles is that the higher the fluid pressure the smaller the droplet size. Standard liquid nozzles produce droplet sizes ranging from 4 000 microns 0 157 down to 300 microns 0 012 in diameter.

Droplets are small particles of liquid. An example would be. For technical drawings and 3 d models click on a part number. Further it is important to be familiar with the various diameter related terms.

Where d is the mean droplet size at pressure 1 p1 and pressure 2 p2. Since spray nozzles are designed to perform under many different spraying conditions more than one nozzle may meet the requirements for a given application. The higher the frequency the smaller the median drop size. Nozzles with droplet sizes of 20 microns to 60 microns are good for moisturizing coating evaporative cooling and dust suppression.

The probability of impaction also increases as the size of the water spray droplets decreases because as the size of the droplets decreases the number of droplets increases rocha 2005. Impingement nozzles allow water to exit the nozzle in a straight stream through a very small orifice typically 008 or about 200μ or microns and immediately collide with a solid pin which effectively atomizes the water into tiny droplets usually between 1μ and 15μ. A spray is a collection of a variety of sizes of fluid droplets moving in a controlled fashion. For reference a large raindrop is around 6 000 microns 0 236 in diameter.

The particle and water droplet sizes should be roughly equivalent for optimal agglomeration. For any given hydraulic nozzle the relationship between pressure and mean droplet size can be expressed as. Benefits of fine droplet size include even coating and liquid conservation. Surface tension causes an atomized liquid to break up into spherical droplets.

A vmd dv0 5 of 400 for example indicates that half of the volume is in droplet sizes smaller than 400 microns and half the volume is in droplet sizes larger than 400 microns. In practice a nozzle produces droplets from a compact flow of fluid within a specific size range. Selecting a nozzle based on the pattern and other spray characteristics that are required generally yields good results. Answers to progress check 1.

One of the primary reasons atomizing spray nozzles are used is because of their fine droplet size. Use nozzles producing a coarse vmd of 400 or greater droplet category. Some pesticide labels specify a recommended droplet size. Atomization is the process of breaking up liquids into droplets.

For example a 120 khz nozzle produces a median drop size of 18 microns when spraying water.