Comparison of PIV and PDA droplet velocity measurement techniques on two high-pressure water mist nozzles

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The need for reliable measurement of droplet velocities and droplet size has increased with the more widespread use of water mist systems. Two optical measuring techniques have been investigated, Particle Image Velocimetry (PIV) and phase Doppler anemometry (PDA). Measurements have been performed on two high-pressure nozzles, a hollow cone nozzle and a full cone nozzle. Both methods performed well close to the nozzle and further away from the nozzle. In the intermediate region the results obtained with PIV are biased against the larger droplets. The two methods complement each other, PIV giving the instantaneous velocity field and PDA giving both the droplet velocity and droplet size at a point. The measurement indicates that higher throw length can be archived with a full cone nozzle compared to the hollow cone nozzle, if both nozzles have the same cone angle and flow rate.


  • Bjarne Husted
  • Per Petersson
  • Ivar Lund
  • Göran Holmstedt
Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik
  • Annan samhällsbyggnadsteknik
  • Husbyggnad


Sidor (från-till)1030-1045
TidskriftFire Safety Journal
StatusPublished - 2009
Peer review utfördJa