Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 68: Microfluidics (joint session DY/CPP)
CPP 68.6: Talk
Friday, April 5, 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.