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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Transport and Confinement I

CPP 17.7: Vortrag

Dienstag, 1. April 2014, 11:45–12:00, ZEU 260

Enhanced Dispersion by Elastic Turbulent Flow Through Porous Media — •Christian Scholz¹, Frank Wirner¹, and Clemens Bechinger^1,2 — ¹2. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — ²Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, 70569 Stuttgart, Germany

We experimentally investigate hydrodynamic dispersion of micron-sized tracer particles in elastic turbulent flows of semi-dilute polymer solutions through a periodic porous medium at ultra low Reynolds numbers Re<5×10⁻⁴. The asymptotic behaviour of the transversal mean squared displacement is linear and characterized by a dispersion coefficient D_⊥, that grows non-linearly with the Weisenberg number Wi and is several orders of magnitude larger compared to laminar flow. While the enhanced velocity fluctuations appear as Wi dependent noise, for Wi far away from the onset of elastic turbulence we observe a non-linear asymmetry in the flow field.