-
Article
Open AccessMagnetic Janssen effect
A pile of grains, even when at rest in a silo, can display fascinating properties. One of the most celebrated is the Janssen effect, named after the pioneering engineer who explained the pressure saturation at...
-
Article
Family-Vicsek scaling of detachment fronts in granular Rayleigh-Taylor instabilities during sedimentating granular/fluid flows
When submillimetric particles are confined in a fluid such that a compact cluster of particles lie above the clear fluid, particles will detach from the lower boundary of the cluster and form an unstable sepa...
-
Article
Stick slip displacement of confined granular mixtures: Bubble expansion
When a compressible gas displaces a granular mixture in a quasi 2D space, friction causes stick slip motion. A localized slip event at the interface allows expansion of the compressed gas and a sudden forward...
-
Article
Open AccessPatterns and flow in frictional fluid dynamics
Pattern-forming processes in simple fluids and suspensions have been studied extensively, and the basic displacement structures, similar to viscous fingers and fractals in capillary dominated flows, have been ...
-
Article
Open AccessInfluence of Viscous Fingering on Dynamic Saturation–Pressure Curves in Porous Media
We report on results from primary drainage experiments on quasi-two-dimensional porous models. The models are transparent, allowing the displacement process and structure to be monitored in space and time duri...
-
Article
Effects of Pressure Oscillations on Drainage in an Elastic Porous Medium
The effects of seismic stimulation on the flow of two immiscible fluids in an elastic synthetic porous medium is experimentally investigated. A wetting fluid is slowly evacuated from the medium, while a pressu...
-
Article
Quake Catalogs from an Optical Monitoring of an Interfacial Crack Propagation
Using an experimental setup which allows to follow optically the propagation of an interfacial crack front in a heterogeneous medium, we show that the fracture front dynamics is governed by local and irregular...
-
Chapter
Quake Catalogs from an Optical Monitoring of an Interfacial Crack Propagation
Using an experimental setup which allows to follow optically the propagation of an interfacial crack front in a heterogeneous medium, we show that the fracture front dynamics is governed by local and irregular...
-
Article
Validity of the Janssen law in narrow granular columns
We have performed experiments on narrow granular columns to test the validity of the Janssen law under such conditions. The weight at the bottom of the cylinder and the compression and movement of the packin...
-
Article
Slow Crack Propagation and Slip Correlations
— The propagation of an interfacial crack through a weak plane of a transparent Plexiglas block is studied experimentally. The toughness is controlled artificially by a sand blasting procedure, and fluctuates...
-
Article
Drainage in a Rough Gouge-Filled Fracture
We study experimentally and numerically slow drainage of a non-wetting fluid in a saturated fracture. Facing surfaces of the experimental fracture (25 cm × 25cm) are obtained from the casting of a brittle frac...
-
Chapter
Modeling Granular Flows
We study a variety of granular flows and some models by means of a combination of simulations, experiments and analytic considerations. The models as well as the physical systems are governed by the presence o...
-
Chapter
Granular Flow in Hoppers and Tubes
We have studied the effect of gas-grain interaction on the flow of sand for two different experiments. The first experiment deals with the intermittent flow observed in a closed hour-glass. The intermittency r...
-
Chapter and Conference Paper
Granular flow: Some experimental results
The relative influence the friction forces and interstitial air is analyzed under two experimental conditions. First, the motion of one ball on a rough surface built by gluing a monolayer of spheres on an incl...
-
Chapter
Structure of Miscible and Immiscible Displacement Fronts in Pourous Media
We demonstrate displacement processes of fluids by other fluids in porous and non-porous Hele-Shaw cells. We also demonstrate a new result9 showing the fractal nature of the dispersion front of a tracer when it i...
