Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Poster: Wetting, Micro and nanofluidics
CPP 21.1: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Forced Displacement Experiments in quasi 2D Porous Media — •Michael Jung1,2, Marta Sanchez de la Lama2, Stephan Herminghaus2, Martin Brinkmann2, and Ralf Seemann1,2 — 1Universität des Saarlandes, Saarbrücken, Germany — 2Max Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany
As a simple model for a forced liquid displacement process into porous media, we study two-dimensional flow experiments in microfluidic devices. The devices and the porous structure are fabricated from oil-resistant UV-curable glue using a soft-lithography technique. These devices were first saturated with oil of different viscosities and densities (silicon oils or alkanes). The oil was then displaced by flushing water of ether different flow rates or at an adjustable constant pressure. To precisely distinguish between the oily and the aqueous phase we add a dye to the aqueous phase. We observe the global and local dynamic behavior of liquid front using high speed microscopy. The effect of various additional parameters, such as wettability and the size and geometry of the pore space on the position and the roughening of the liquid front as well as the remaining fraction of trapped oil was investigated in detail. Parallel to the experiments we are studying numerically the effect of porosity and wetting conditions on two dimensional two phase flows in porous media. To this end we employ a multiple particle collision method for immiscible liquids that allows to vary the wettability of the pore walls.