We present a three-dimensional network model to simulate two- and three-phase capillary dominated processes at the pore level. The displacement mechanisms incorporated in the model are based on the physics of multiphase flow observed in micromodel experiments. All the important features of immiscible fluid flow at the pore scale, such as wetting layers, spreading layers of the intermediate-wet ...

A facile and efficient hard-templating strategy is reported for the preparation of porous nickel microspheres with excellent uniformity and strong magnetism. The strategy involves impregnation of porous polymer microspheres with nickel precursors, calcination to remove the template, followed by thermal reduction. The morphology, structure, and the property of the Ni microspheres were characteri...

Immiscible displacement of one fluid by another fluid in porous media has important applications in a wide range of different technologies. Most often mentioned is hydrology and and oil recovery. From a theoretical point of view, the displacement process is very complex and hard to describe in detail. Especially, much attention has been paid to the rich variety of displacement structures that i...

We propose and analyze a model for sharp fronts in porous media, aiming at an investigation of the capillary pressure. Using the notion of microlocal patterns we analyze the local behavior of the system. Depending on the structure of the local patterns we can derive upscaled equations that characterize the capillary pressure and include the hysteresis effect that is known from the physical system.

We present various numerical studies conducted with a novel pore-scale simulation technology called Direct Hydrodynamic (DHD) Simulation that can be used to study multiphase flow at various scales ranging from individual pore-scale events to complex scenarios like capillary de-saturation and relative permeability of digitized rock samples. DHD uses a diffuse interface description for fluid-flui...

| Mixed nite element methods on multiblock domains are considered for nonlinear degenerate parabolic equations arising in modeling multiphase ow in porous media. The subdomain grids need not match on the interfaces, where mortar nite element spaces are introduced to properly impose ux-matching conditions. The low regularity of the solution is treated through time integration, and the degeneracy...

Wettability exerts fundamental control over multiphase flow in porous media, which has been extensively studied uniform-wet media. In contrast, mixed-wet media is less well-understood. We combine microfluidic experiments and pore-scale simulations to study the displacement of oil by water a mostly oil-wet patterned with discrete water-wet clusters. Our work demonstrates complex nature wettabili...