Yield stress fluid behavior of foam in porous media

被引：7
|
作者：
Mauray, Alexis [1 ]
Chabert, Max [2 ]
Bodiguel, Hugues [1 ]
机构：
[1] Univ Grenoble Alpes, CNRS, Grenoble INP LRP UMR 5520, F-38000 Grenoble, France
[2] Solvay, 1 Biopolis Dr, Singapore 138622, Singapore
来源：
PHYSICAL REVIEW FLUIDS | 2020年 / 5卷 / 09期
关键词：
IMPLICIT-TEXTURE; LONG BUBBLES; FLOW; PRESSURE; MOTION; DISPLACEMENT; GENERATION; VISCOSITY; MOBILITY; MODELS;
D O I：
10.1103/PhysRevFluids.5.094004
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Flow of foams is studied in a model porous medium, in a large range of capillary numbers Ca and relative gas flow rates f(g). From pressure measurements, we find that the effective viscosity is a decreasing power-law function of Ca, with the exponent ranging from -1 to -0.75. Direct observation reveals that the flow is heterogeneous. The fraction of preferential paths increases with both f(g) 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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页数：9
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