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Emulsifier adsorption kinetics influences drop deformation and breakup in turbulent emulsification

Håkansson, Andreas LU and Nilsson, Lars LU (2023) In Soft Matter 19(46). p.9059-9073
Abstract

Turbulent drop breakup is of large importance for applications such as food and pharmaceutical processing, as well as of substantial fundamental scientific interest. Emulsification typically takes place in the presence of surface-active emulsifiers (natural occurring and/or added). Under equilibrium conditions, these lower the interfacial tension, enabling deformation and breakup. However, turbulent deformation is fast in relation to emulsifier kinetics. Little is known about the details of how the emulsifier influences drop deformation under turbulent conditions. During the last years, significant insight in the mechanism of turbulent drop breakup has been reached using numerical experiments. However, these studies typically use a... (More)

Turbulent drop breakup is of large importance for applications such as food and pharmaceutical processing, as well as of substantial fundamental scientific interest. Emulsification typically takes place in the presence of surface-active emulsifiers (natural occurring and/or added). Under equilibrium conditions, these lower the interfacial tension, enabling deformation and breakup. However, turbulent deformation is fast in relation to emulsifier kinetics. Little is known about the details of how the emulsifier influences drop deformation under turbulent conditions. During the last years, significant insight in the mechanism of turbulent drop breakup has been reached using numerical experiments. However, these studies typically use a highly simplistic description of how the interface responds to turbulent stress. This study investigates how the limited exchange rate of emulsifier between the bulk and the interface influences the deformation process in turbulent drop breakup for application-relevant emulsifiers and concentrations, in the context of state-of-the-art single drop breakup simulations. In conclusion, if the Weber number is high or the emulsifier is supplied at a concentration giving an adsorption time less than 1/10th of the drop breakup time, deformation proceeds as if the emulsifier adsorbed infinitely fast. Otherwise, the limited emulsifier kinetics delays breakup and can alter the breakup mechanism.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
19
issue
46
pages
15 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:37982600
  • scopus:85178264251
ISSN
1744-6848
DOI
10.1039/d3sm01213a
language
English
LU publication?
yes
id
9ba8fe0b-03fe-499c-9989-fad3b24c7078
date added to LUP
2023-11-21 08:14:44
date last changed
2024-02-20 03:53:40
@article{9ba8fe0b-03fe-499c-9989-fad3b24c7078,
  abstract     = {{<p>Turbulent drop breakup is of large importance for applications such as food and pharmaceutical processing, as well as of substantial fundamental scientific interest. Emulsification typically takes place in the presence of surface-active emulsifiers (natural occurring and/or added). Under equilibrium conditions, these lower the interfacial tension, enabling deformation and breakup. However, turbulent deformation is fast in relation to emulsifier kinetics. Little is known about the details of how the emulsifier influences drop deformation under turbulent conditions. During the last years, significant insight in the mechanism of turbulent drop breakup has been reached using numerical experiments. However, these studies typically use a highly simplistic description of how the interface responds to turbulent stress. This study investigates how the limited exchange rate of emulsifier between the bulk and the interface influences the deformation process in turbulent drop breakup for application-relevant emulsifiers and concentrations, in the context of state-of-the-art single drop breakup simulations. In conclusion, if the Weber number is high or the emulsifier is supplied at a concentration giving an adsorption time less than 1/10th of the drop breakup time, deformation proceeds as if the emulsifier adsorbed infinitely fast. Otherwise, the limited emulsifier kinetics delays breakup and can alter the breakup mechanism.</p>}},
  author       = {{Håkansson, Andreas and Nilsson, Lars}},
  issn         = {{1744-6848}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{46}},
  pages        = {{9059--9073}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Soft Matter}},
  title        = {{Emulsifier adsorption kinetics influences drop deformation and breakup in turbulent emulsification}},
  url          = {{http://dx.doi.org/10.1039/d3sm01213a}},
  doi          = {{10.1039/d3sm01213a}},
  volume       = {{19}},
  year         = {{2023}},
}