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Title: Theory of Wetting-Induced Fluid Entrainment by Advancing Contact Lines on Dry Surfaces
Author: Ledesma Aguilar, Rodrigo Andrés
Hernández Machado, Aurora
Pagonabarraga Mora, Ignacio
Keywords: Mecànica de fluids
Microscòpia de força atòmica
Fluid mechanics
Atomic force microscopy
Issue Date: 2013
Publisher: American Physical Society
Abstract: We report on the onset of fluid entrainment when a contact line is forced to advance over a dry solid of arbitrary wettability. We show that entrainment occurs at a critical advancing speed beyond which the balance between capillary, viscous, and contact-line forces sustaining the shape of the interface is no longer satisfied. Wetting couples to the hydrodynamics by setting both the morphology of the interface at small scales and the viscous friction of the front. We find that the critical deformation that the interface can sustain is controlled by the friction at the contact line and the viscosity contrast between the displacing and displaced fluids, leading to a rich variety of wetting-entrainment regimes. We discuss the potential use of our theory to measure contact-line forces using atomic force microscopy and to study entrainment under microfluidic conditions exploiting colloid-polymer fluids of ultralow surface tension.
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It is part of: Physical Review Letters, 2013, vol. 110, p. 264502-1-264502-5
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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