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The effect of stator design on flowrate and velocity fields in a rotor-stator mixer—An experimental investigation

Mortensen, Hans Henrik; Innings, Fredrik LU and Håkansson, Andreas LU (2017) In Chemical Engineering Research and Design 121. p.245-254
Abstract

Rotor-stator mixers (RSMs) are available in different designs, e.g. with different number of stator slots and slot dimensions. However, the relationship between stator design and the RSM hydrodynamics is not well understood. Consequently, manufacturers still base design and stator screen recommendations on trial-and-error. This study reports experimental measurements of how the flowrate through the stator slots, and velocity profiles in the region of relevance for mixing and breakup, is influenced by the stator slot width, using particle image velocimetry. It is concluded that the flowrate can be described by a design dependent flow number for all investigated geometries and that the flow number decreases with increasing slot width.... (More)

Rotor-stator mixers (RSMs) are available in different designs, e.g. with different number of stator slots and slot dimensions. However, the relationship between stator design and the RSM hydrodynamics is not well understood. Consequently, manufacturers still base design and stator screen recommendations on trial-and-error. This study reports experimental measurements of how the flowrate through the stator slots, and velocity profiles in the region of relevance for mixing and breakup, is influenced by the stator slot width, using particle image velocimetry. It is concluded that the flowrate can be described by a design dependent flow number for all investigated geometries and that the flow number decreases with increasing slot width. Moreover, by studying the velocity profiles at different rotor speeds and designs, it is concluded that the velocity profile, its skewness and the proportion of back-flow (fluid re-entering the slot) scales with the flow number of the design. This suggests that the flow number, in addition to rotor speed, is a highly relevant parameter for describing the effect of design on batch RSM hydrodynamics.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Emulsification, Flow number, Fluid mixing technology, Mixing, PIV, Rotor-stator mixer
in
Chemical Engineering Research and Design
volume
121
pages
10 pages
publisher
IChemE
external identifiers
  • scopus:85016614135
  • wos:000401201100021
ISSN
0263-8762
DOI
10.1016/j.cherd.2017.03.016
language
English
LU publication?
yes
id
0afc581a-7643-4911-975e-dbc5d9ca8a3b
date added to LUP
2017-04-11 12:12:19
date last changed
2017-09-18 13:32:08
@article{0afc581a-7643-4911-975e-dbc5d9ca8a3b,
  abstract     = {<p>Rotor-stator mixers (RSMs) are available in different designs, e.g. with different number of stator slots and slot dimensions. However, the relationship between stator design and the RSM hydrodynamics is not well understood. Consequently, manufacturers still base design and stator screen recommendations on trial-and-error. This study reports experimental measurements of how the flowrate through the stator slots, and velocity profiles in the region of relevance for mixing and breakup, is influenced by the stator slot width, using particle image velocimetry. It is concluded that the flowrate can be described by a design dependent flow number for all investigated geometries and that the flow number decreases with increasing slot width. Moreover, by studying the velocity profiles at different rotor speeds and designs, it is concluded that the velocity profile, its skewness and the proportion of back-flow (fluid re-entering the slot) scales with the flow number of the design. This suggests that the flow number, in addition to rotor speed, is a highly relevant parameter for describing the effect of design on batch RSM hydrodynamics.</p>},
  author       = {Mortensen, Hans Henrik and Innings, Fredrik and Håkansson, Andreas},
  issn         = {0263-8762},
  keyword      = {Emulsification,Flow number,Fluid mixing technology,Mixing,PIV,Rotor-stator mixer},
  language     = {eng},
  month        = {05},
  pages        = {245--254},
  publisher    = {IChemE},
  series       = {Chemical Engineering Research and Design},
  title        = {The effect of stator design on flowrate and velocity fields in a rotor-stator mixer—An experimental investigation},
  url          = {http://dx.doi.org/10.1016/j.cherd.2017.03.016},
  volume       = {121},
  year         = {2017},
}