Nozzle configuration

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In tower snowmaking, the droplet size is mostly controlled by the size of nozzle being used. Smaller droplets are an advantage during warmer snowmaking ambient temperatures (23°F to 30°F, -5.0°C to –1.1°C), as the higher surface/volume ratios promote rapid cooling.

However, these smaller particles will have less momentum when leaving the snow nozzle and will not be distributed as far (Barthold, 1986).

Normally, a recirculation zone created by the entrained ambient air at the nozzle exit will cause some of the low momentum, fine droplets to settle out of the spray and deposit close to the nozzle. The larger droplets with more momentum deposit towards the middle of the accumulation pile, and some smaller droplets tend to collect towards the end of the pile.

However, Barthold notes that this classic distribution is not always the case with some nozzle types. With swirling or wide-angle cone nozzles, the heavy, high momentum particles often deposit closest to the nozzle exit.

Different nozzle types will also have an effect on the height of trajectory and the break up of the water stream. The break up of the water stream will produce smaller water droplets, having a decreased trajectory. Therefore, a compromise between the droplet’s freezability and trajectory is necessary (Collins, 1989).


[edit] Also see

[edit] Reference

  • Wikipedia Snowmaking [2]
  • Calibration of Snowmaking Equipment for Efficient Use on Virginia’s Smart Road Edward J. Shea [3]

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