Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Micro and Nanofluidics I

CPP 26.2: Vortrag

Mittwoch, 24. März 2010, 14:15–14:30, H39

Pore-scale investigations of multiphase fluid systems subject to freeze-thaw — •Kamaljit Singh^{1, 2, 3}, Robert K. Niven¹, Timothy J. Senden⁴, Michael L. Turner⁴, Adrian P. Sheppard⁴, Jill P. Middleton⁴, and Mark A. Knackstedt⁴ — ¹School of Aerospace, Civil and Mechanical Engineering, The University of New South Wales at ADFA, Northcott Drive, Canberra, ACT, 2600, Australia — ²Max Planck Institute for Dynamics and Self-Organization, D-37018 Göttingen, Germany — ³Experimental Physics, Saarland University, 66123 Saarbrücken, Germany — ⁴Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, ACT, 0200, Australia

The pore scale behavior of non-aqueous phase liquid (NAPL) contaminants in porous media undergoing freeze-thaw cycles is studied by conducting various experiments, including two-dimensional micromodels, containing residual NAPL in a monolayer of glass beads; and three-dimensional glass-bead cell using X-ray micro-computed tomography. It is shown that freeze-thaw cycles have a substantial impact on the distribution of residual NAPL (in initially water saturated porous media), including the rupture and remobilization of trapped NAPL due to freezing-induced pressure forces, and ganglion fragmentation into singlet ganglia. The results of these experiments are interpreted by developing pore-scale models. The findings have important implications for the behavior of subsurface NAPL contamination in cold climate regions.