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Analyse et validation de l'efficacité de la séparation des particules dans un champ centrifuge sous des conditions laminaires et de mélange optimal.

Analysis and validation of particle separation efficiency in a centrifugal field under laminar and perfect mixing conditions.

Auteurs : ZHANG Y.

Résumé

In the area of large volume air cleaning, existing literature concluded that it was impractical using cyclones to achieve a particle cut size smaller than 10 µm. Particle cut size refers to the particle diameter at which the collection efficiency is 50%. Cyclone technology has been limited to use for small volume air sampling or large particle separation (typically larger than 25 µm in diameter). This paper re-examines the existing cyclone theory and particle separation in a centrifugal field. Particle separation efficiency under laminar and perfect mixing flow conditions was analyzed and equations were developed. These separation efficiency equations define the range of particle separation efficiency for a given design. The equations were validated using an uniflow deduster, a low-pressure uniflow cyclone type particle separation device. The particle cut size of the deduster was 4 µm at a pressure drop of 100 Pa (0.4 in. water) and a flow rate of 135 L/s. Effects of other forces involved in the particle separation process, such as electrostatic and diffusive forces, are discussed after comparing the models and the experimental data.

Détails

  • Titre original : Analysis and validation of particle separation efficiency in a centrifugal field under laminar and perfect mixing conditions.
  • Identifiant de la fiche : 2006-1471
  • Langues : Anglais
  • Sujet : Technologie
  • Source : ASHRAE Transactions. 2003 annual Meeting, Kansas City, Missouri, USA. Volume 109, part 2 + CD-ROM.
  • Date d'édition : 2003

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