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An experimental investigation of the probability distribution of turbulent fragmenting stresses in a high-pressure homogenizer
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 Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 177, 139-150 p.Article in journal (Refereed) Published
Abstract [en]

The high-pressure homogenizer (HPH) is, together with the rotor–stator mixer (RSM), the standard equipment for emulsification in many fields of chemical processing. Both give rise to intense turbulence which, in turn, gives rise to drop breakup. Previous investigations focus on average turbulent disruptive stress. However, turbulence is a stochastic phenomenon and drop breakup will be characterized by instantaneous stresses, or more specifically by the probability distribution of instantaneous turbulent stresses.

This study uses high-resolution particle image velocimetry (PIV) data to measure the probability distribution of turbulent stresses in the HPH. It is concluded that stress distributions approximately follow a lognormal model and that the skewness of the distributions decreases with increasing distance from the gap exit until a constant distribution shape is obtained at the position where the turbulence is fully developed. This converged stress distribution is similar to that obtained for RSMs in previous studies, suggesting that stress distribution shape is a general property. Moreover, large differences are observed when comparing these experimental stress distributions to the most widely used expression for describing this stochastic effect in fragmentation rate models. This indicates that the traditionally used fragmentation rate models can be fundamentally flawed, at least in relation to RSM and HPH emulsification.

Place, publisher, year, edition, pages
2018. Vol. 177, 139-150 p.
Keyword [en]
Emulsification; Turbulence; Fragmentation; High-pressure homogenizer; Rotor-stator mixer
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hkr:diva-17665DOI: 10.1016/j.ces.2017.11.045OAI: oai:DiVA.org:hkr-17665DiVA: diva2:1162504
Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2017-12-04Bibliographically approved

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Research Environment Food and Meals in Everyday Life (MEAL)Avdelningen för Mat- och måltidsvetenskap
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