Liquid relative permeability through foam-filled porous media: Experiments

Our measurements show that liquid permeability of foam-filled granular packings is fully controlled by the microstructure of the foam. The main parameter is the bubble-to-grain size ratio, the increase of which leads to a very sharp decrease of the liquid permeability. The decrease of the liquid saturation also contributes to decrease the permeability. The choice made for the surfactant is shown to be also important.