Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 26: Micro and Nanofluidics I
CPP 26.2: Talk
Wednesday, March 24, 2010, 14:15–14:30, H39
Pore-scale investigations of multiphase fluid systems subject to freeze-thaw — •Kamaljit Singh1, 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.