Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 20: Focused Session: Pattern formation in colloidal and granular systems

DY 20.5: Topical Talk

Donnerstag, 26. März 2009, 11:45–12:15, HÜL 386

Injection in a confined granular suspension: from the Saffman-Taylor fingering instability up to flow inside a weakly jammed granular matrix. — Christophe Chevalier², Anke Lindner¹, Oeistein Johnson¹, and •Eric Clement¹ — ¹PMMH-ESPCI, Paris, France — ²LCPC, Paris , France

The dynamics of fluid injection inside another one is a strong and debated issue in the context of many industrial and geophysical applications. When the displaced fluid is a complex fluid, the injection front is rarely stable and complex injection patterns usually form. These instabilities lead to strong and heterogeneous flows localisation and present a severe challenges to the fundamental understanding and accurate modelling, of multi-phases flow transfer. Here, we present recent experimental work on a simple experimental model of fluid injection inside a granular suspension confined in a Hele-Shaw cell. The density of the suspension can be varied continuously from low values up to the suspension jamming limit. The injected fluid can either be a non miscible fluid or a miscible one (like the suspension's surrounding fluid). This simple model allows a detailed investigation of many archetypal situations that extend the Saffman-Taylor fingering instability to the case of particulate fluids (Chevalier et al. Phys.Rev.Lett.(2007); Johnson et al. Phys.Rev.E(2008)) and address in a controlled way the case of hydro-fracturing in mechanically weak porous materials (Chevalier et al. JNNFM (2008)). Other collaborators : K-J.Maloy, E.Flekkoy, Univ.Oslo; R.Toussaint,J.Schmittbuhl, IPG Strasbourg.