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Impaction-pin nozzles consist of a smooth,
short, straight-through orifice with an impaction-pin
located above the orifice such that the water jet
impacts on it. When the water jet hits the impaction-pin,
it is separated into a conical-shaped sheet. In the
case of a swirl-jet type nozzle, an internal swirl
chamber is used, which forces the water to exit the
orifice tangentially to the axis of the orifice so
that a hollow cone pattern is formed.
The internal frictional losses (performance loss)
associated with the swirl chamber in a swirl-jet nozzle
are greater than those of an impaction-pin nozzle
with a smooth, short straight-through orifice. In
other words, a swirl-jet nozzle uses more energy to
form the conical sheet of water so the sheet has less
velocity and is not stretched as thin.
Given two nozzles with the same operating pressure
and orifice diameter, the nozzle with less internal
losses will generally make smaller droplets.
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Related
Links
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Brochure:
Gas Turbine Inlet Air
Fogging.
 Download
PDF
White Paper:
A Comparative Guide
to Inlet Air Cooling Technologies.
Download
PDF
Article:
NOZZLE COMPARISON
Comparing nozzles helps a buyer make an informed
comparison of different fogging systems.
Download
PDF |
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MeeFog
Concept
HVAC