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The mechanisms of displacement of one fluid by another are investigated in an etched network. Experiments show that both fluids are simultaneously present in a duct, the wetting fluid remaining in the extreme corners of the cross-section. Calculation of displacement pressures are in good agreement with experiments for drainage, imbibition and removal of blobs. The results may be related to some flow behaviour exhibited in porous media.
Lenormand et al. (Sat,) studied this question.
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