Interface dynamics in porous media: A random-field description

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Abstract
We report a variety of measurements on fluid interface motion through model porous media. The dynamics shares many features with other systems pinned by random fields. Over a range of pressures randomness pins the interface. In this range there are many metastable interface configurations and relaxation is extremely slow. The dc response outside the pinned region is markedly nonlinear. Oscillations in the pressure occur at constant velocity which reflect the pore geometry.