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Experimental invest...
Experimental investigations of turbulent fragmenting stresses in a rotor-stator mixer. Part 2. Probability distributions of instantaneous stresses
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- Håkansson, Andreas (författare)
- Kristianstad University,Högskolan i Kristianstad,Food and Meals in Everyday Life (MEAL),Department of Food and Meal Science,Avdelningen för mat- och måltidsvetenskap
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- Andersson, Ronnie, 1975 (författare)
- Chalmers University of Technology,Chalmers tekniska högskola
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- Mortensen, Hans Henrik (författare)
- Tetra Pak AB,Tetra Pak,Tetra Pak International
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- Innings, Fredrik (författare)
- Lund University,Lunds universitet,Avdelningen för livsmedel och läkemedel,Institutionen för processteknik och tillämpad biovetenskap,Institutioner vid LTH,Lunds Tekniska Högskola,Division of Food and Pharma,Department of Process and Life Science Engineering,Departments at LTH,Faculty of Engineering, LTH,Tetra Pak,Tetra Pak International
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(creator_code:org_t)
- Elsevier BV, 2017
- 2017
- Engelska.
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Ingår i: Chemical Engineering Science. - : Elsevier BV. - 0009-2509. ; 171, s. 638-649
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Livsmedelsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Food Science (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Nyckelord
- Emulsification
- Fragmentation
- High-shear mixer
- Intermittency
- Mixing
- Rotor-stator mixer
- Turbulence
- High-shear mixer
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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