Next Article in Journal
Automatic Single Droplet Generator with Control over Droplet Size and Detachment Frequency
Previous Article in Journal
Thickness and Structure of Adsorbed Water Layer and Effects on Adhesion and Friction at Nanoasperity Contact
Previous Article in Special Issue
One- and Two-Dimensional NMR in Studying Wood–Water Interaction at Moisturizing Spruce. Anisotropy of Water Self-Diffusion
Open AccessFeature PaperArticle

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

1
Institute for Technical Thermodynamics, Technische Universität Darmstadt, Alarich-Weiss-Straße 10, 64287 Darmstadt, Germany
2
Heidelberger Druckmaschinen AG, Gutenbergring, 69168 Wiesloch, Germany
*
Author to whom correspondence should be addressed.
Colloids Interfaces 2019, 3(3), 56; https://doi.org/10.3390/colloids3030056
Received: 12 July 2019 / Revised: 1 August 2019 / Accepted: 2 August 2019 / Published: 9 August 2019
(This article belongs to the Special Issue Wetting on Micro/Nano-Scale: From Fundamentals to Application)
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. View Full-Text
Keywords: wetting; spreading; complex fluids; surfactant; computational fluid dynamics; volume-of-fluid method wetting; spreading; complex fluids; surfactant; computational fluid dynamics; volume-of-fluid method
Show Figures

Figure 1

MDPI and ACS Style

Antritter, T.; Hachmann, P.; Gambaryan-Roisman, T.; Buck, B.; Stephan, P. Spreading of Micrometer-Sized Droplets under the Influence of Insoluble and Soluble Surfactants: A Numerical Study. Colloids Interfaces 2019, 3, 56.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop