Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: POSTERS Colloids and Liquids
CPP 39.14: Poster
Donnerstag, 26. März 2009, 17:00–19:30, P3
Transport in micromodel porous media visualized by colloidal particles — •Yujie Li1,2, Maria Zvyagolskaya1, and Clemens Bechinger1,2 — 12. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart,
Porous structures are found extensively in nature from soils/rocks to biological tissues. Transport properties of molecules and particles in porous media are of significant interest for environmental remediation, drug delivery, oil recovery, composite material reinforcement, and chemical reactors.
In our work, transport processes in pore scale are modelled and visualized by colloidal solutions flowing through 2D micromodels, which were designed with different spatial statistic properties. Reynolds number and Péclet number were varied in two orders of magnitude. The influences of the ratio of particle/structure sizes were studied as well. We analyzed particle trajectories by taking into account both coherent and incoherent particle movement. Streamlines of the flow field were reconstructed from the coherent part of particle velocities. Interesting phenomenon like bifurcation of the flow pathway, slowing-down, and trapping of particles at stagnant parts in the flow field were observed and could be attributed to the incoherent movement.