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Rodrigo Ledesma Aguilar: „Fluid entrainment in contact lines”
Institute of Theoretical Physics, University of Oxford, UK

Fluid entrainment in interfacial systems occurs when a contact line is forced above a critical threshold, often characterised by a critical velocity, leading to the decoupling of the front and contact line. In this talk, we shall explore the entrainment process in the lubrication limit, where inertial effects are negligible. Particularly, we shall address the problem from a mesoscopic point of view, relying on Lattice-Boltzmann simulations of a binary fluid mixture in the diffuse interface limit. We first study the dynamics of a meniscus forced between parallel plates, where a meniscus-penetration transition occurs due to entrainment. We will then focus on how wetting interactions control the entrainment threshold in forced microfilaments, leading to the periodic emission of drops, of potential impact to microfluidic technologies.