SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 42: Poster: Active Matter, Soft Matter, Fluids

DY 42.10: Poster

Donnerstag, 30. März 2023, 13:00–16:00, P1

Wetting of reflecting plates by an Active Brownian fluid — •Matthieu Mangeat, Shauri Chakraborty, Adam Wysocki, and Heiko Rieger — Universität des Saarlandes, Saarbrücken, Germany

We study, using interacting active Brownian particles (ABP), the wall-wetting mechanism of active sedimenting fluid. We consider a minimal model of active particles under gravitational field, inside a two-dimensional rectangular box. An accumulation of particles near the bottom wall is observed, as well as the wetting of vertical plates by the rise of active particles against the gravity, even without any attractive force within the system. We characterize this wall-wetting by the meniscus height, calculated from stationary density profile and depending on the inter-particle repulsion. The maximum wetting height depends super-linearly on active sedimentation length for interacting ABP, and linearly for non-interacting ABP. We also observe two large vortices concentrated close to the meniscus, due to the persistence motion of ABP against the gravity. Moreover, with non-interacting ABP, a current flow is present near the boundaries for which we propose a coarse-grained description.