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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 62: Fluids and Interfaces III
CPP 62.6: Vortrag
Donnerstag, 23. März 2017, 16:15–16:30, ZEU 255
Wettability characteristics in fractionally wet porous media: a variation of the Cieplak-Robbins model — •Weiwei Li1,2, Martin Brinkmann1,2, Michael Jung1,2, Stephan Herminghaus2, and Ralf Seemann1,2 — 1Universität des Saarlandes, Saarbrücken, Germany — 2Max Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany
An extended two-dimensional model based on the seminal work of Cieplak and Robbins is developed to study the role that wettability plays in slow immiscible fluid displacement. The porous media in this model consists of two-dimensional disks, and the emerging series of local interfacial instabilities is controlled by the Laplace pressure, that drives the quasi-static motion of liquid fronts. Unlike the original CR model, we respect the possibility of advancing or retracting interfaces during periodic changes of the Laplace pressure. This variation of CR model allows us to study capillary saturation characteristics in fractionally wet disk packs. Different statistical processes are applied to generate bidisperse disk packs with positional disorder. The simulations for a drainage-imbibition cycle reveal that there is a minimum hysteresis loop opening in fractionally wet packs. Several potential explanations are examined and discarded, favoring a simple explanation in terms of the distribution of entry pressures for non-cooperative pore filling events.