Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Poster: Micro- and Nanofluidics
CPP 35.4: Poster
Wednesday, March 16, 2011, 17:00–19:00, P2
Forced Imbibitions Experiments in 2D Porous Media. — •Michael Jung1,2, Stefan Herminghaus2, and Ralf Seemann1,2 — 1Universität des Saarlandes, Saarbrücken, Germany — 2Max Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany
As a simple model for forced liquid imbibitions 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 different flow rates. 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 and the remaining oil saturation using high speed microscopy. The effect of various additional parameters, such as surface tension 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.