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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Wetting, Superamphiophobicity, Micro- and Nanofluidics I

CPP 18.11: Vortrag

Dienstag, 1. April 2014, 12:15–12:30, ZEU 222

Forced multiphase flow on the pore scale explored in 3D — •Hagen Scholl¹, Kamaljit Singh², Alen Kabdenov¹, Mario Scheel², and Stephan Herminghaus³ — ¹Saarland University, Saarbrücken, Germany — ²ESRF, Grenoble, France — ³MPI-DS, Göttingen, Germany

Using ultra fast x-ray tomography the forced imbibition of an aqueous phase into an initially oil filled matrix is studied. The water is volume controlled flushed into cylindrical columns filled with oil saturated spherical bead packs and the forced imbibition is imaged in real time using ultrafast x-ray tomography. The 3d time series are analyzed in terms of oil content, front area and the pore throat filling behavior. For typical flow parameter at low capillary numbers, as e.g. relevant for oil recover, the multiphase flow hardly depends on gravitational effects and details of the pore space. Capillary forces, however, are a key to understand the forced multiphase flow. A compact front develops for a wettable invading phase whereas a branched front develops for a non-wettable invading phase.