Capillary-Driven Instability of Immiscible Fluid Interfaces Flowing in Parallel in Porous Media

Details Capillary-Driven Instability of Immiscible Fluid Interfaces Flowing in Parallel in Porous Media Capillary-Driven Instability of Immiscible Fluid Interfaces Flowing in Parallel in Porous Media

2007-09-20

arxiv.org/abs/0709.3209v2

Phys. Rev. E 78, 035302(R) (2008)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures. Journal-refs added and some figures updated

Scientific paper

10.1103/PhysRevE.78.035302

When immiscible wetting and non-wetting fluids move in parallel in a porous medium, an instability may occur at sufficiently high capillary numbers so that interfaces between the fluids initially held in place by the porous medium are mobilized. A boundary zone containing bubbles of both fluids evolve which has a well defined thickness. This zone moves at constant average speed towards the non-wetting fluid. A diffusive current of bubbles of non-wetting fluid into the wetting fluid is set up.

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