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Numerical modelling of micro-droplet formation

Lörstad, Daniel LU ; Laurell, Thomas LU and Nilsson, Johan LU (2005) 8th International Conference on Miniaturized Systems for Chemistry and Life Sciences In Micro Total Analysis Systems 2004, Vol 1 p.665-667
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
multiphase flow, droplet formation, CFD, Volume of Fluid (VOF)
in
Micro Total Analysis Systems 2004, Vol 1
issue
296
pages
665 - 667
publisher
Springer
conference name
8th International Conference on Miniaturized Systems for Chemistry and Life Sciences
external identifiers
  • wos:000228997000223
ISSN
0260-6291
language
English
LU publication?
yes
id
a16bddf2-16dd-4f53-8c38-0b4d187f5f54 (old id 1406278)
date added to LUP
2009-06-08 10:57:08
date last changed
2016-04-16 03:15:22
@inproceedings{a16bddf2-16dd-4f53-8c38-0b4d187f5f54,
  abstract     = {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.},
  author       = {Lörstad, Daniel and Laurell, Thomas and Nilsson, Johan},
  booktitle    = {Micro Total Analysis Systems 2004, Vol 1},
  issn         = {0260-6291},
  keyword      = {multiphase flow,droplet formation,CFD,Volume of Fluid (VOF)},
  language     = {eng},
  number       = {296},
  pages        = {665--667},
  publisher    = {Springer},
  title        = {Numerical modelling of micro-droplet formation},
  year         = {2005},
}