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Local levels of dissipation rate of turbulent kinetic energy in a rotor-stator mixer with different stator slot widths: an experimental investigation
Tetra Pak Processing Systems.
Tetra Pak Processing Systems & Lund University.
Kristianstad University, Research Environment Food and Meals in Everyday Life (MEAL). Kristianstad University, School of Education and Environment, Avdelningen för Mat- och måltidsvetenskap.ORCID iD: 0000-0002-0002-661X
2018 (English)In: Chemical Engineering Research and Design, ISSN 0263-8762, Vol. 130, p. 52-62Article in journal (Refereed) Published
Abstract [en]

Rotor-stator mixers (RSMs) are widely used for emulsification and mixing. However, relatively little is known about the relationship between RSM design, hydrodynamics and performance. Previous studies have investigated shaft power draw as a function of design. However, power draw alone is not sufficient to predict efficiency. In order to understand the effect on performance it is important to investigate how the local turbulent stress is influenced by design parameters.

This study investigates the effect of stator slot width on the local dissipation rate of turbulent kinetic energy using particle image velocimetry coupled with a sub-resolution modeling approach suggested in previous studies. Results are compared to traditional shaft power draw measurements and a set of emulsification experiments.

It is concluded that wider slots, although requiring less total shaft power, provide a higher maximal (time-averaged) dissipation rate of TKE, which explains why they give rise to more efficient drop breakup. Apparently, more of the power input is transformed into pumping for the narrower slots which leaves less energy for turbulent dissipation.

The study illustrates the need for supplementing traditional power draw measurements with local flow characterization in order to better understand the relationship between RSM hydrodynamics and dispersion performance.

Place, publisher, year, edition, pages
2018. Vol. 130, p. 52-62
Keyword [en]
Rotor-stator mixer; Emulsification; Particle image velocimetry; Turbulence; Dissipation; Mixing
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hkr:diva-17721DOI: 10.1016/j.cherd.2017.12.006ISI: 000425577100006OAI: oai:DiVA.org:hkr-17721DiVA, id: diva2:1167841
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-03-08Bibliographically approved

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Håkansson, Andreas
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Research Environment Food and Meals in Everyday Life (MEAL)Avdelningen för Mat- och måltidsvetenskap
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf