Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session 2

CPP 37.14: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P3

Spatial distributions of surface energies in porous media: Insights from experiments and simulations on the displacement of immiscible fluids — •Julie Murison¹, Thomas Hiller¹, Benoit Semin^3,1, Stephan Herminghaus¹, Jean-Christophe Baret¹, Matthias Schröter¹, and Martin Brinkmann^2,1 — ¹Max Planck Institute of Dynamics and Self Organisation, Göttingen — ²Experimental Physics, Saarland Univeristy — ³Laboratoire de Physique Statistique, ENS, Paris

Various phenomena observed during immiscible displacement in a porous medium can be related to pore wall wettability. Traditionally the overall wettability of a rock sample is quantified by measuring capillary pressure saturation curves (CPS). To establish a link between these global quantities and the pore-scale distribution of surface energies, we developed a series of model porous media with the same average surface energy, but differing in the typical extension of the wettable surface domains. Complementary to the experiments we use multiple particle collision dynamics (MPCD) to simulate two-phase flow in porous media. The MPCD algorithm is extended to allow for different surface energies to create similar model porous media as used in the experiments. Experimental CPS measurements show that the work dissipated in a complete cycle is monotonically decreasing with the size of the heterogeneities. Imaging of the invading liquid fronts using x-ray tomography revealed front smoothening for small correlation lengths, consistent with a dissipation of energy. The same quantitative behavior is observed in the simulations.