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Yield stress fluid behavior of foam in porous media
Phys. Rev. Fluids 5, 094004 – Published 17 September, 2020
DOI: https://doi.org/10.1103/PhysRevFluids.5.094004
Abstract
Flow of foams is studied in a model porous medium, in a large range of capillary numbers Ca and relative gas flow rates . From pressure measurements, we find that the effective viscosity is a decreasing power-law function of Ca, with the exponent ranging from to . Direct observation reveals that the flow is heterogeneous. The fraction of preferential paths increases with both and Ca. In a straight channel of varying cross section, a bubble train behaves as a shear-thinning yield stress fluid. This feature accounts quantitatively for the effective viscosity in the micromodel.
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