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DY: Fachverband Dynamik und Statistische Physik

DY 61: Microfluidics (joint session DY/CPP)

DY 61.6: Vortrag

Freitag, 5. April 2019, 11:30–11:45, H6

Particle trajectory entanglement in confined fluidic systems — •Alvaro Marin¹, Massimiliano Rossi², and Christian J. Kähler² — ¹Physics of Fluids, University of Twente, The Netherlands — ²Bundeswehr University Munich, Germany

Suspensions in motion can show very complex and counterintuitive behavior, particularly at high concentrations. However, in this work we show how suspensions at substantially lower dilute concentrations can develop complex dynamics. Such non-trivial dynamics appear when particles tend to interlace their trajectories, only bonded by hydrodynamic interactions. Using a fairly simple system of non-Brownian particles flowing in a confined channel, we reveal a rich complexity in the particle dynamics due to the dominance of short-range particle-particle and particle-wall hydrodynamic interactions. Such rich dynamics are revealed and studied via experiments and particle dynamics simulations, resulting in a very good quantitative comparison.