Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Transport and Confinement I
CPP 17.8: Vortrag
Dienstag, 1. April 2014, 12:00–12:15, ZEU 260
Hydrodynamic dispersion of micron-sized colloids in micro-structured porous media — •Frank Wirner1, Christian Scholz1, and Clemens Bechinger1,2 — 12. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, 70569 Stuttgart, Germany
The flow of liquids through porous media is of importance in many areas, such as groundwater pollution, secondary oil recovery or blood perfusion inside the body. The complex geometry of porous media can give rise to a combination of principal pathways, along which particles are transported by advection, and stagnant parts, wherein particles can only move slowly by diffusion. Especially in porous media with low porosities these stagnant parts may eventually dominate the transport properties of fluids and colloids. The mean sojourn time of a particle in a stagnant part, however, can easily exceed experimentally accessible time scales. Therefore, we investigate the effect of stagnant parts on the transit times of micron-sized particles in quasi-two-dimensional porous structures by a semi-experimental approach, which enables us to capture these rare events. The longest transit times can be related to the stagnant parts of the structure, whereby it might be possible to predict the amount of trapped fluid in porous media.