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Title: Dynamics of driven three-dimensional thin films: from hdrophilic to superhydrophobic substrates
Author: Ledesma Aguilar, Rodrigo Andrés
Hernández Machado, Aurora
Pagonabarraga Mora, Ignacio
Keywords: Mecànica de fluids
Pel·lícules fines
Fluid mechanics
Thin films
Issue Date: 2008
Publisher: American Institute of Physics
Abstract: We study the forced displacement of a thin film of fluid in contact with vertical and inclined substrates of different wetting properties, that range from hydrophilic to hydrophobic, using the lattice-Boltzmann method. We study the stability and pattern formation of the contact line in the hydrophilic and superhydrophobic regimes, which correspond to wedge-shaped and nose-shaped fronts, respectively. We find that contact lines are considerably more stable for hydrophilic substrates and small inclination angles. The qualitative behavior of the front in the linear regime remains independent of the wetting properties of the substrate as a single dispersion relation describes the stability of both wedges and noses. Nonlinear patterns show a clear dependence on wetting properties and substrate inclination angle. The effect is quantified in terms of the pattern growth rate, which vanishes for the sawtooth pattern and is finite for the finger pattern. Sawtooth shaped patterns are observed for hydrophilic substrates and low inclination angles, while finger-shaped patterns arise for hydrophobic substrates and large inclination angles. Finger dynamics show a transient in which neighboring fingers interact, followed by a steady state where each finger grows independently.
Note: Reproducció del document publicat a:
It is part of: Physics of Fluids, 2008, vol. 20, p. 072101-1-072101-12
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ISSN: 1070-6631
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)
Articles publicats en revistes (Física Quàntica i Astrofísica)

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