Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Focus: Wetting on smooth and rough surfaces: From spreading to superhydrophobicity I
CPP 22.5: Vortrag
Mittwoch, 13. März 2013, 10:45–11:00, H34
Mixed Wettability on the Mesoscopic scale: Effect of wetting correlation length in porous media — •Julie Murison1, Benoit Semin2, Jean-Christophe Baret1, Stephan Herminghaus1, Matthias Schröter1, and Martin Brinkmann1 — 1Max Planck Institute of Dynamics and Self Organisation, Göttingen, Germany — 2Laboratoire de Physique Statistique, ENS, Paris, France
In order to better understand the behavior of immiscible two phase flow through mixed wetting porous media, we have designed a series of experiments to test the effect of isolated and controlled microscopic heterogeneities (sub-grain) on a larger sample scale (20 mm). Here we present the effect of wetting correlation length on the sub-pore to multi-pore (aprox 1mm) scale. Initial results indicate that sample composition alone cannot adequately describe the fluids behavior, but rather the size of the heterogeneity creates different wetting environments. In particular sub-pore heterogeniety causes large hysteresis in fluid displacement profiles. Recently we combine gravametric measurements of fluid displacement with X-ray microtomography to characterise and quantify effective trapping environments for droplets within the porous media.