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High resolution experimental measurement of turbulent flow field in a high pressure homogenizer model and its implications on turbulent drop fragmentation

Håkansson, Andreas LU ; Fuchs, Laszlo LU ; Innings, Fredrik; Revstedt, Johan LU ; Trägårdh, Christian LU and Bergenståhl, Björn LU (2011) In Chemical Engineering Science 66(8). p.1790-1801
Abstract
Particle image velocimetry is performed on a model of a high pressure homogenizer, scaled for qualitative similarity of the one phase turbulent flow field in a production scale homogenizer. Flow fields in gap entrance, gap and gap outlet chamber are obtained with high resolution. The measurements show gap flow development and formation of a turbulent wall adherent jet when exiting into the outlet chamber. Turbulent kinetic energy spectra show how the turbulent energy available for fragmentation is transported over distance along the jet centre axis. The high resolution images are also used together with a Kolmogorov-Hinze theory framework for discussing drop fragmentation together with a direct evaluation of disruptive stresses from... (More)
Particle image velocimetry is performed on a model of a high pressure homogenizer, scaled for qualitative similarity of the one phase turbulent flow field in a production scale homogenizer. Flow fields in gap entrance, gap and gap outlet chamber are obtained with high resolution. The measurements show gap flow development and formation of a turbulent wall adherent jet when exiting into the outlet chamber. Turbulent kinetic energy spectra show how the turbulent energy available for fragmentation is transported over distance along the jet centre axis. The high resolution images are also used together with a Kolmogorov-Hinze theory framework for discussing drop fragmentation together with a direct evaluation of disruptive stresses from measurements. For the turbulent inertial mechanism large drops experience high fragmenting force close to eight gap heights downstream of the gap exit where as this occurs closer to 20 gap heights for smaller drops. The turbulent viscous mechanism is most efficient at a downstream distance of eight gap heights into the outlet chamber for all drops sizes. (C) 2011 Elsevier Ltd. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Homogenization, Turbulence, Hydrodynamics, Emulsion, Particle image, velocimetry, Fragmentation
in
Chemical Engineering Science
volume
66
issue
8
pages
1790 - 1801
publisher
Elsevier
external identifiers
  • wos:000288015800024
  • scopus:79952250043
ISSN
0009-2509
DOI
10.1016/j.ces.2011.01.026
language
English
LU publication?
yes
id
30832f77-3c73-43c3-b4a9-9a7b1cd76ee2 (old id 1868562)
date added to LUP
2011-04-19 12:05:11
date last changed
2017-09-03 04:10:21
@article{30832f77-3c73-43c3-b4a9-9a7b1cd76ee2,
  abstract     = {Particle image velocimetry is performed on a model of a high pressure homogenizer, scaled for qualitative similarity of the one phase turbulent flow field in a production scale homogenizer. Flow fields in gap entrance, gap and gap outlet chamber are obtained with high resolution. The measurements show gap flow development and formation of a turbulent wall adherent jet when exiting into the outlet chamber. Turbulent kinetic energy spectra show how the turbulent energy available for fragmentation is transported over distance along the jet centre axis. The high resolution images are also used together with a Kolmogorov-Hinze theory framework for discussing drop fragmentation together with a direct evaluation of disruptive stresses from measurements. For the turbulent inertial mechanism large drops experience high fragmenting force close to eight gap heights downstream of the gap exit where as this occurs closer to 20 gap heights for smaller drops. The turbulent viscous mechanism is most efficient at a downstream distance of eight gap heights into the outlet chamber for all drops sizes. (C) 2011 Elsevier Ltd. All rights reserved.},
  author       = {Håkansson, Andreas and Fuchs, Laszlo and Innings, Fredrik and Revstedt, Johan and Trägårdh, Christian and Bergenståhl, Björn},
  issn         = {0009-2509},
  keyword      = {Homogenization,Turbulence,Hydrodynamics,Emulsion,Particle image,velocimetry,Fragmentation},
  language     = {eng},
  number       = {8},
  pages        = {1790--1801},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Science},
  title        = {High resolution experimental measurement of turbulent flow field in a high pressure homogenizer model and its implications on turbulent drop fragmentation},
  url          = {http://dx.doi.org/10.1016/j.ces.2011.01.026},
  volume       = {66},
  year         = {2011},
}