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Breakup dynamics of capillary bridges on hydrophobic stripes

Hartmann, M. ; Fricke, M. ; Weimar, L. ; Gründing, D. ; Marić, T. ; Bothe, D. ; Hardt, S. (2021)
Breakup dynamics of capillary bridges on hydrophobic stripes.
In: International Journal of Multiphase Flow, 140
doi: 10.1016/j.ijmultiphaseflow.2021.103582
Article, Bibliographie

Abstract

The breakup dynamics of a capillary bridge on a hydrophobic stripe between two hydrophilic stripes is studied experimentally and numerically using direct numerical simulations. The capillary bridge is formed from an evaporating water droplet wetting three neighboring stripes of a chemically patterned surface. By considering the breakup process in a phase space representation, the breakup dynamics can be evaluated without the uncertainty in determining the precise breakup time. The simulations are based on the Volume-of-Fluid (VOF) method implemented in Free Surface 3D (FS3D). In order to construct physically realistic initial data for the VOF simulation, Surface Evolver is employed to calculate an initial configuration consistent with experiments. Numerical instabilities at the contact line are reduced by a novel discretization of the Navier-slip boundary condition on staggered grids. The breakup of the capillary bridge cannot be characterized by a unique scaling relationship. Instead, at different stages of the breakup process different scaling exponents apply, and the structure of the bridge undergoes a qualitative change. In the final stage of breakup, the capillary bridge forms a liquid thread that breaks up consistently with the Rayleigh-Plateau instability.

Item Type: Article
Erschienen: 2021
Creators: Hartmann, M. ; Fricke, M. ; Weimar, L. ; Gründing, D. ; Marić, T. ; Bothe, D. ; Hardt, S.
Type of entry: Bibliographie
Title: Breakup dynamics of capillary bridges on hydrophobic stripes
Language: English
Date: 1 July 2021
Publisher: Elsevier Science
Journal or Publication Title: International Journal of Multiphase Flow
Volume of the journal: 140
DOI: 10.1016/j.ijmultiphaseflow.2021.103582
Abstract:

The breakup dynamics of a capillary bridge on a hydrophobic stripe between two hydrophilic stripes is studied experimentally and numerically using direct numerical simulations. The capillary bridge is formed from an evaporating water droplet wetting three neighboring stripes of a chemically patterned surface. By considering the breakup process in a phase space representation, the breakup dynamics can be evaluated without the uncertainty in determining the precise breakup time. The simulations are based on the Volume-of-Fluid (VOF) method implemented in Free Surface 3D (FS3D). In order to construct physically realistic initial data for the VOF simulation, Surface Evolver is employed to calculate an initial configuration consistent with experiments. Numerical instabilities at the contact line are reduced by a novel discretization of the Navier-slip boundary condition on staggered grids. The breakup of the capillary bridge cannot be characterized by a unique scaling relationship. Instead, at different stages of the breakup process different scaling exponents apply, and the structure of the bridge undergoes a qualitative change. In the final stage of breakup, the capillary bridge forms a liquid thread that breaks up consistently with the Rayleigh-Plateau instability.

Uncontrolled Keywords: SFB1194_Z-INF
Additional Information:

Artikel-ID 103582

Divisions: 16 Department of Mechanical Engineering
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 > A02: Experimental Investigation of Coalescence and Breakup of Droplets on Solid Surfaces – Generic Configuration Sessile Drop
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area B: Modeling and Simulation
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area B: Modeling and Simulation > B01: Modelling and VOF based Simulation of the Multiphysics of Irreversible Thermodynamic Transfer Processes at Dynamic Contact Lines
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area B: Modeling and Simulation > B02: Direct Numerical Simulation of Locally Coupled Interface Processes at Dynamic Contact Lines
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
16 Department of Mechanical Engineering > Institute for Nano- and Microfluidics (NMF)
Date Deposited: 01 Nov 2021 07:26
Last Modified: 11 Dec 2023 15:15
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