Alke, A. ; Bothe, D. (2009)
3D Numerical Modeling of Soluble Surfactant at Fluidic Interfaces Based on the Volume-of-Fluid Method.
In: Fluid Dynamics & Materials Processing, 5 (4)
doi: 10.3970/fdmp.2009.005.345
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We present a computational approach based on the Volume-of-Fluid (VOF) method for simulating the influence of a soluble surfactant on the behavior of two-phase systems with deformable interface. Our approach is applicable to diffusion controlled processes, where the relation between the area-specific excess surfactant concentration on the interface and the volume-specific concentration adjacent to the interface is given by an adsorption isotherm. Main issues of the numerical model are an extended surface transport theorem used for describing the interfacial flux and an iso-surface of the VOF-variable used as a connected approximation for the interface. 3D-simulations of a bubble moving through a surfactant solution show the formation of a monotone concentration profile along the bubble surface with a surfactant-rich zone at the bubble's rear end. This is accompanied by regions of depleted and increased surfactant concentration in the bulk phase due to adsorption and desorption, respectively. The rise velocity reflects the retardation effect known from experiments.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2009 |
| Autor(en): | Alke, A. ; Bothe, D. |
| Art des Eintrags: | Bibliographie |
| Titel: | 3D Numerical Modeling of Soluble Surfactant at Fluidic Interfaces Based on the Volume-of-Fluid Method |
| Sprache: | Englisch |
| Publikationsjahr: | 2009 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Fluid Dynamics & Materials Processing |
| Jahrgang/Volume einer Zeitschrift: | 5 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.3970/fdmp.2009.005.345 |
| Kurzbeschreibung (Abstract): | We present a computational approach based on the Volume-of-Fluid (VOF) method for simulating the influence of a soluble surfactant on the behavior of two-phase systems with deformable interface. Our approach is applicable to diffusion controlled processes, where the relation between the area-specific excess surfactant concentration on the interface and the volume-specific concentration adjacent to the interface is given by an adsorption isotherm. Main issues of the numerical model are an extended surface transport theorem used for describing the interfacial flux and an iso-surface of the VOF-variable used as a connected approximation for the interface. 3D-simulations of a bubble moving through a surfactant solution show the formation of a monotone concentration profile along the bubble surface with a surfactant-rich zone at the bubble's rear end. This is accompanied by regions of depleted and increased surfactant concentration in the bulk phase due to adsorption and desorption, respectively. The rise velocity reflects the retardation effect known from experiments. |
| Freie Schlagworte: | Soluble Surfactant, Two-Phase Flow, VOF - Simulation, Surface transport theorem. |
| Fachbereich(e)/-gebiet(e): | Exzellenzinitiative Exzellenzinitiative > Exzellenzcluster 04 Fachbereich Mathematik 04 Fachbereich Mathematik > Analysis 04 Fachbereich Mathematik > Analysis > Mathematische Modellierung und Analysis Zentrale Einrichtungen Exzellenzinitiative > Exzellenzcluster > Center of Smart Interfaces (CSI) 04 Fachbereich Mathematik > Mathematische Modellierung und Analysis (MMA) |
| Hinterlegungsdatum: | 05 Apr 2011 14:07 |
| Letzte Änderung: | 07 Feb 2024 11:55 |
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