Misting Spray Nozzle

Misting nozzles produce a fine mist or fog. Due to the small size of the droplets, the drops may look as if they are floating. Instead, the drops are falling very slowly.

What BETE nozzle series and types produce this spray pattern?

Misting nozzles create a very fine mist or fog. Droplets are typically small enough that buoyancy is significant compared to gravity, allowing drops to appear to float. In actuality, in the absence of upward airflow particles are simply falling very slowly.

The higher the pressure, the smaller the droplets. In cases of lower pressure, a larger number of smaller flow nozzles may be required.

How is this spray pattern achieved through nozzle design?

High pressure shears the liquid by forcing it through tiny openings. An impingement pin distributes the liquid as it leaves the nozzle, deflecting it on the chosen surface.

Common misting nozzle geometries include pigtail/spiral, impingement, small diameter orifice with a whirl chamber, and air mixing/atomizing.

  • Small Opening: Shear liquid by forcing it through tiny openings.
  • Impingement Nozzles: Scatter liquid by impacting it on a pin immediately upon exiting the nozzle, causing deflection onto the surface of your choice.
  • Air Atomizing: Uses compressed air to break up liquid creating a fine suspension. Air atomizing nozzles can produce many different spray patterns.

Operating Specifications & Frequently Asked Questions for Misting Nozzles

Misting nozzles are generally considered medium-angle (70-90 degrees) and cone-shaped. Some nozzles (MW) will experience narrower patterns at lower pressures. Air-atomizing nozzles can also be classified as misting nozzles in terms of drop size, however, the addition of atomizing air can aid in forming different patterns and increasing projection distance.

Misting nozzles produce the smallest droplets for direct pressure or single-fluid “hydraulic” nozzles. The droplet size falls in the range of 20-500 microns.

The recommended operating pressure for a misting nozzle is 20 - 3000 psi.

The flow rates are considered low, on the range of 0.006 - 10 GPM.

  • The small droplet size is ideal for when you need complete evaporation.
  • Misting nozzles can provide a low flow rate that gives optimal results for scientific or pharmaceutical applications where a small dosing pump is used.
  • Misting nozzles also can also produce a high flow rate with a small drop size requirement (i.e. area humidification header).
  • Other misting nozzles without atomizing air can create smaller droplets (MWH, misting header).
  • Mist and coating of supermarket produce (especially fruit and vegetables) and other foodstuffs
  • Moisten paper, water plants
  • Compost piles of crushed products
  • Produce fog effects for theatrical productions
  • Spray oil mist for coating and lubricating bearings
  • Mist onto concrete to facilitate curing
  • Any low viscous fluids under 10 centipoise (water is most common).
  • Above 10 centipoise you may see diminished atomization.
  • Some clogging can generally be prevented by filtering suspended solids where necessary.
  • Virtually any temperature can be accommodated.
  • Misting nozzles are used in below-freezing temperatures as nucleating nozzles for snow-making.
  • These super fine droplets freeze immediately and act as the core on which large snowflakes are built.
  • Misting nozzles are used in hot applications where the very fine droplets evaporate immediately.
  • Contact us to discuss superheated fluids.