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Numerical modelling of micro-droplet formation

Författare:
Publiceringsår: 2005
Språk: Engelska
Sidor: 665-667
Publikation/Tidskrift/Serie: Micro Total Analysis Systems 2004, Vol 1
Nummer: 296
Dokumenttyp: Konferensbidrag
Förlag: Springer

Sammanfattning

The formation of micro-droplets due to a pulsative micro-jet (width of 40 mu m) is studied using the 3D Navier-Stokes equations for multi-phase flows using the Volume of Fluid (VOF) and Volume of Solid (VOS) models. The droplet formation is studied for different transient velocity conditions and mass rates. The numerical results show reasonable agreement with both analytical theory and experimental data. The results show that the surface tension forces are too dominating for the droplets to be released from the constriction opening for a mean jet velocity at the constriction opening of U-jet similar to 1 m/s, that multiple (satellite) droplets are formed for U-jet similar to 10 m/s and that a single droplet may be found for U-jet-values in between. The results also indicate the conditions required in order to achieve repeatedly stable single micro-droplet formation.

Disputation

Nyckelord

  • Technology and Engineering
  • Chemistry
  • multiphase flow
  • droplet formation
  • CFD
  • Volume of Fluid (VOF)

Övriga

8th International Conference on Miniaturized Systems for Chemistry and Life Sciences
2014-09-28
Malmo, Sweden
Published
Yes
  • ISSN: 0260-6291

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