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

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
  • Bjarne Husted
  • Per Petersson
  • Ivar Lund
  • Göran Holmstedt
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
  • Other Civil Engineering
  • Building Technologies

Keywords

  • Water mist, PIV, PDA, High-pressure nozzles, Spray, Measurements
Original languageEnglish
Pages (from-to)1030-1045
JournalFire Safety Journal
Volume44
Issue number8
Publication statusPublished - 2009
Publication categoryResearch
Peer-reviewedYes