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oai:recercat.cat:2445/492432025-12-04T20:47:39Zcom_2072_1057col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Ledesma Aguilar, Rodrigo Andrés author Hernández Machado, Aurora author Pagonabarraga Mora, Ignacio author 2014-01-29T07:19:22Z 2014-01-29T07:19:22Z 2013 2014-01-29T07:19:23Z 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. Mecànica de fluids Col·loides Hidrodinàmica Viscositat Microscòpia de força atòmica Fluid mechanics Colloids Hydrodynamics Viscosity Atomic force microscopy Theory of Wetting-Induced Fluid Entrainment by Advancing Contact Lines on Dry Surfaces