Effective capillary pressure and permeability of a granular material during imbibition in a closed column

We present a method to determine the effective capillary pressure and permeability of column packed with granular material by means imbibition experiments using closed measuring both liquid uptake differential that develops ahead front. The is based on finding an intermediate range values, where Washburn approximation no longer valid but recently obtained description accurately reproduces experimental results. To this pressures we calculate goodness fit corresponding pressure-solution, at short times, implicit which includes non-linear dependence compatible finely divided solids. Using also allow us compare maximum advancing measured Bartell’s static method. perform polydimethylsiloxane, glass beads or lactose powder. show possible characterize system. observe heterogeneity system reduces characterization range. However, it was powder columns, leads spontaneous bubbling measurements are not possible.