Abstract
Two-phase flow within porous media at low interfacial tension and high capillary number (>10 −3) behaves very differently from flow at high interfacial tension and low capillary number. Qualitative features have been observed experimentally using 2,6-lutidine-water mixtures in a transparent model porous medium. Three photographic observations are presented; the first illustrates a “pore-to-pore hopping” mechanism of wetting phase movement, the second shows pore-to-pore transfer of wetting phase in a different pore geometry, and the third reveals a gravity induced instability.
Published Version
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