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Theory of wetting-induced fluid entrainment by advancing contact lines on dry surfaces | | Rodrigo Ledesma-Aguilar
; Aurora Hernández-Machado
; Ignacio Pagonabarraga
; | | Date: |
11 Jun 2013 | | 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
ultra-low surface tension. | | Source: | arXiv, 1306.2569 | | Services: | Forum | Review | PDF | Favorites | |
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