Instabilities during dispersion flow through porous media: pore-size effect

摘要

We investigate experimentally and theoretically the instabilities which can occur during the vertical isothermal movement of two miscible fluids through a column of porous medium in the regime of mechanical dispersion. For the experiments we consider a non-deformable, homogenous and isotropic medium. There is no chemical or biological reaction during the experiments. Flow instabilities that occur during the tests depend upon numerous factors such as: solute density, viscosity, dispersion, flow velocity and pore diameter. We analyze the experimental results and we discuss the mechanisms of these instabilit es.