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Dynamic simulation of emulsion formation in a high pressure homogenizer

Håkansson, Andreas LU ; Trägårdh, Christian LU and Bergenståhl, Björn LU (2009) In Chemical Engineering Science 64(12). p.2915-2925
Abstract
A simulation model for emulsification in High Pressure Homogenization (HPH), based on a population balance approach, is developed assuming it to be controlled by three simultaneous processes; fragmentation, coalescence and adsorption of a macromolecular emulsifier. The aim is to investigate the implications of adding a set of models together; studying the effects of dynamics, size effects and process interactions.

For fragmentation; turbulent inertial and turbulent viscous forces are included using a dynamic model based on the Weber and Capillary number. It was extended to include a deformation time-scale.

The rate of adsorption and coalescence is assumed to be controlled by the collision rate of macromolecular... (More)
A simulation model for emulsification in High Pressure Homogenization (HPH), based on a population balance approach, is developed assuming it to be controlled by three simultaneous processes; fragmentation, coalescence and adsorption of a macromolecular emulsifier. The aim is to investigate the implications of adding a set of models together; studying the effects of dynamics, size effects and process interactions.

For fragmentation; turbulent inertial and turbulent viscous forces are included using a dynamic model based on the Weber and Capillary number. It was extended to include a deformation time-scale.

The rate of adsorption and coalescence is assumed to be controlled by the collision rate of macromolecular stabilizer and bare interface, modeled using convective and diffusive transport in turbulent flow.

By comparing simulation results to general trends found in the literature, it can be concluded that the models can reproduce the general HPH process well. By dividing the active region into discrete steps the dynamic process could also be examined, indicating the homogenization process being composed of three stages with coalescence predominantly found in the last one. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Homogenisation Dynamic simulation Emulsion Population balance Fragmentation Coalescence
in
Chemical Engineering Science
volume
64
issue
12
pages
2915 - 2925
publisher
Elsevier
external identifiers
  • wos:000271298100015
  • scopus:67349272730
ISSN
0009-2509
DOI
10.1016/j.ces.2009.03.034
language
English
LU publication?
yes
id
91c02bdd-730a-43c8-8d3c-d6f19d97883f (old id 1478462)
date added to LUP
2009-09-29 17:33:59
date last changed
2017-09-03 04:11:30
@article{91c02bdd-730a-43c8-8d3c-d6f19d97883f,
  abstract     = {A simulation model for emulsification in High Pressure Homogenization (HPH), based on a population balance approach, is developed assuming it to be controlled by three simultaneous processes; fragmentation, coalescence and adsorption of a macromolecular emulsifier. The aim is to investigate the implications of adding a set of models together; studying the effects of dynamics, size effects and process interactions. <br/><br>
 For fragmentation; turbulent inertial and turbulent viscous forces are included using a dynamic model based on the Weber and Capillary number. It was extended to include a deformation time-scale. <br/><br>
 The rate of adsorption and coalescence is assumed to be controlled by the collision rate of macromolecular stabilizer and bare interface, modeled using convective and diffusive transport in turbulent flow. <br/><br>
 By comparing simulation results to general trends found in the literature, it can be concluded that the models can reproduce the general HPH process well. By dividing the active region into discrete steps the dynamic process could also be examined, indicating the homogenization process being composed of three stages with coalescence predominantly found in the last one.},
  author       = {Håkansson, Andreas and Trägårdh, Christian and Bergenståhl, Björn},
  issn         = {0009-2509},
  keyword      = {Homogenisation
Dynamic simulation
Emulsion
Population balance
Fragmentation
Coalescence},
  language     = {eng},
  number       = {12},
  pages        = {2915--2925},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Science},
  title        = {Dynamic simulation of emulsion formation in a high pressure homogenizer},
  url          = {http://dx.doi.org/10.1016/j.ces.2009.03.034},
  volume       = {64},
  year         = {2009},
}