> Fog Theory > Advantages over Impaction Pin Nozzle Design
The MicroMist System's MX8 Atomizing Nozzle is engineered for maximum performance
in a wide range of environments. Claims have been made by other
fog system suppliers that the impaction pin nozzle design, which atomizes
water externally, is a better alternative. Listed below
are some of the significant design differences between these two nozzle types.
Read on to see how superior design, performance and quality are ample justification
for choosing the MX8 over the impaction pin type nozzle.
MX8: Constantly-lubricated internal atomization pin means the nozzle orifice is the only possible point of significant wear.
Impaction Pin: Two points of possible significant wear (impaction pin and orifice) increase probability of premature particle size increase and evaporation efficiency deterioration.
MX8: Water particles are allowed to travel in the same direction as the natural flow through the orifice and enter the air stream parallel to the air flow direction. Particle conglomeration is thereby limited, rendering the MX8 an evaporative-efficient nozzle.
Impaction Pin: Particles exiting the nozzle are first forced into a trajectory almost perpendicular to the natural direction of flow through the orifice, then forced into an air stream which runs perpendicular to the particle trajectory. The air stream overcomes particle inertia, forcing the particles into a pattern of conglomeration. Thus, larger droplets are created downstream, rendering the impaction pin nozzle less efficient. see illustration below
MX8: Water supply is centrally-filtered at the pump, minimizing maintenance requirements.
Impaction Pin: Each nozzle is filtered individually, creating the need for a labor-intensive maintenance schedule.
OPTIONAL ACCESSORY OPTIONS
MX8: Nozzle check valves prevent low-pressure spray and dripping during pressurization and de-pressurization.
Impaction Pin: No nozzle check valve available.
MX8: Stainless steel lockwire secures entire nozzle to prevent adjacent equipment from foreign object damage.
Impaction Pin: No protection from foreign object damage in the event of impaction pin becoming disliged from nozzle body.
The illustration below shows the tendencies of the respective nozzle designs. Water particles projected into an air stream from an impaction pin nozzle will converge rapidly and increase in size. The MX8 atomizes particles significantly more parallel with the air flow direction. Therefore, droplet accumulation is limited and the total surface area to volume ratio remains high at greater distances from the nozzle. Although initial droplet size for each nozzle design may be comparable near the orifice, the MicroMist System's MX8 creates greater evaporative efficiency downstream.
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