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Experimental investigations of turbulent fragmenting stresses in a rotor-stator mixer. Part 2: probability distributions of instantaneous stresses
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
Chalmers University.
Tetra Pak .
Tetra Pak .
2017 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 171, 638-649 p.Article in journal (Refereed) Published
Abstract [en]

Drop fragmentation in high intensity turbulent emulsification processing equipment-such as rotor-stator mixers (RSMs)-has traditionally been described in terms of a stress balance; between the stabilizing stress of the drop and the time-averaged turbulent stress at the most intense position of the flow. As shown in part 1 of this series, this approach is often a fruitful first approximation. However, the instantaneous local stress experienced by drops differs,from the time-averaged local stress due to hydrodynamics in general and the stochastic nature of a turbulent flow in particular. This study estimates the probability distribution of instantaneous turbulent stresses in an RSM from velocity fields obtained using particle image velocimetry. Results show that regions with low average stress still have a substantial probability of having instantaneously high stresses. This explains why low probability breakup is observed at these positions in visualization experiments. Results also show that the probability distribution of instantaneous stresses is approximately lognormal. The results are compared to two commonly used models for how to take the stochastic variations into account: the exponential decay model, and the multifractal emulsification model. It is concluded that both models predict reasonable distributions shapes but underestimate the width of the stress distribution.

Place, publisher, year, edition, pages
2017. Vol. 171, 638-649 p.
Keyword [en]
Rotor-stator mixer, High-shear mixer, Fragmentation, Turbulence, Intermittency, Emulsification, Mixing
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hkr:diva-17297DOI: 10.1016/j.ces.2017.06.038ISI: 000409285000052OAI: oai:DiVA.org:hkr-17297DiVA: diva2:1143412
Available from: 2017-09-21 Created: 2017-09-21 Last updated: 2017-09-21Bibliographically 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
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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
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