Density difference driven instabilities in porous media

摘要

In the present work, we analyzed density driv- en instabilities in miscible fluids in a random packing of monosized glass spheres (porous medium). The aim of this work is to detect heterogeneities in flow velocity using tracer dispersion because of the sensitivity of this tech- nique. The influence of non-Newtonian rheological prop- erties on the displacement front between two fluids of different densities is particularly studied. We compared the width of the displaced fonts in the case of Newtonian fluids with the same density contrast