The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches

Many industrially relevant emulsification devices are of the high-energy type, where drop deformation and subsequent breakup, take place due to intense turbulent fluid–drop interactions. This includes high-pressure homogenizers as well as rotor-stator mixers (also known as high-shear mixers) of vari...

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Autor principal:	Andreas Håkansson
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	emulsification turbulent drop breakup emulsion turbulence intermittency high-pressure homogenizer Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/577f6e7191cc4d19ae3955fc7c12303f
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spelling	oai:doaj.org-article:577f6e7191cc4d19ae3955fc7c12303f2021-11-25T18:50:18ZThe Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches10.3390/pr91119042227-9717https://doaj.org/article/577f6e7191cc4d19ae3955fc7c12303f2021-10-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1904https://doaj.org/toc/2227-9717Many industrially relevant emulsification devices are of the high-energy type, where drop deformation and subsequent breakup, take place due to intense turbulent fluid–drop interactions. This includes high-pressure homogenizers as well as rotor-stator mixers (also known as high-shear mixers) of various designs. The stress acting on a drop in a turbulent flow field varies over time, occasionally reaching values far exceeding its time-averaged value, but only during limited stretches of time, after which it decreases down to low values again. This it is one factor separating turbulent from laminar emulsification. This contribution reviews attempts to take this intermittently time-varying stress into account in models predicting the characteristic drop diameter resulting from emulsification experiments, focusing on industrially applicable emulsification devices. Two main frameworks are discussed: the Kolmogorov–Hinze framework and the oscillatory resonance framework. Modelling suggestions are critically discussed and compared, with the intention to answer how critical it is to correctly capture this time-varying stress in emulsification modelling. The review is concluded by a list of suggestions for future investigations.Andreas HåkanssonMDPI AGarticleemulsificationturbulent drop breakupemulsionturbulenceintermittencyhigh-pressure homogenizerChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1904, p 1904 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	emulsification turbulent drop breakup emulsion turbulence intermittency high-pressure homogenizer Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	emulsification turbulent drop breakup emulsion turbulence intermittency high-pressure homogenizer Chemical technology TP1-1185 Chemistry QD1-999 Andreas Håkansson The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches
description	Many industrially relevant emulsification devices are of the high-energy type, where drop deformation and subsequent breakup, take place due to intense turbulent fluid–drop interactions. This includes high-pressure homogenizers as well as rotor-stator mixers (also known as high-shear mixers) of various designs. The stress acting on a drop in a turbulent flow field varies over time, occasionally reaching values far exceeding its time-averaged value, but only during limited stretches of time, after which it decreases down to low values again. This it is one factor separating turbulent from laminar emulsification. This contribution reviews attempts to take this intermittently time-varying stress into account in models predicting the characteristic drop diameter resulting from emulsification experiments, focusing on industrially applicable emulsification devices. Two main frameworks are discussed: the Kolmogorov–Hinze framework and the oscillatory resonance framework. Modelling suggestions are critically discussed and compared, with the intention to answer how critical it is to correctly capture this time-varying stress in emulsification modelling. The review is concluded by a list of suggestions for future investigations.
format	article
author	Andreas Håkansson
author_facet	Andreas Håkansson
author_sort	Andreas Håkansson
title	The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches
title_short	The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches
title_full	The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches
title_fullStr	The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches
title_full_unstemmed	The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches
title_sort	role of stochastic time-variations in turbulent stresses when predicting drop breakup—a review of modelling approaches
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/577f6e7191cc4d19ae3955fc7c12303f
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The Role of Stochastic Time-Variations in Turbulent Stresses When Predicting Drop Breakup—A Review of Modelling Approaches

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