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Spreading of Micrometer-Sized Droplets under the Influence of Insoluble and Soluble Surfactants: A Numerical Study

Antritter, Thomas and Hachmann, Peter and Gambaryan-Roisman, Tatiana and Buck, Bernhard and Stephan, Peter (2019):
Spreading of Micrometer-Sized Droplets under the Influence of Insoluble and Soluble Surfactants: A Numerical Study.
In: Colloids and Interfaces, Molecular Diversity Preservation International (MDPI), p. 56, 3, (3), ISSN 2504-5377,
DOI: 10.3390/colloids3030056,
[Online-Edition: https://doi.org/10.3390/colloids3030056],
[Article]

Abstract

Wetting and spreading of surfactant solutions play an important role in many technical applications. In printing processes, the size of individual droplets is typically on the order of a few tens of microns. The purpose of this study is to develop a better understanding of the interaction between spreading and surfactant transport on these small length and related time scales. Therefore, numerical simulations based on the volume-of-fluid method including Marangoni stresses and transport of an insoluble or soluble surfactant are performed. The results for an insoluble surfactant show competing effects of Marangoni flow on the one hand, and a decreasing surfactant concentration as the droplet spreads on the other hand. Even in the case of a soluble surfactant, adsorption and desorption could only partly mitigate these effects, demonstrating the importance of the sorption kinetics for fast, small scale wetting processes.

Item Type: Article
Erschienen: 2019
Creators: Antritter, Thomas and Hachmann, Peter and Gambaryan-Roisman, Tatiana and Buck, Bernhard and Stephan, Peter
Title: Spreading of Micrometer-Sized Droplets under the Influence of Insoluble and Soluble Surfactants: A Numerical Study
Language: English
Abstract:

Wetting and spreading of surfactant solutions play an important role in many technical applications. In printing processes, the size of individual droplets is typically on the order of a few tens of microns. The purpose of this study is to develop a better understanding of the interaction between spreading and surfactant transport on these small length and related time scales. Therefore, numerical simulations based on the volume-of-fluid method including Marangoni stresses and transport of an insoluble or soluble surfactant are performed. The results for an insoluble surfactant show competing effects of Marangoni flow on the one hand, and a decreasing surfactant concentration as the droplet spreads on the other hand. Even in the case of a soluble surfactant, adsorption and desorption could only partly mitigate these effects, demonstrating the importance of the sorption kinetics for fast, small scale wetting processes.

Journal or Publication Title: Colloids and Interfaces
Volume: 3
Number: 3
Publisher: Molecular Diversity Preservation International (MDPI)
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area A: Generic Experiments
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area A: Generic Experiments > A01: Forced Wetting and De-Wetting on Complex Surfaces – Generic Configuration Immersed Body
Profile Areas
Profile Areas > Thermo-Fluids & Interfaces
Date Deposited: 23 Sep 2019 07:01
DOI: 10.3390/colloids3030056
Official URL: https://doi.org/10.3390/colloids3030056
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