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Flow paths in wetting unsaturated flow: experiments and simulations.

Eirik G Flekkøy1, Jean Schmittbuhl, Finn Løvholt

  • 1Department of Physics, University of Oslo, P.O. Box 1048 Blindern, 0316 Oslo 3, Norway.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 23, 2002
PubMed
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Gravity-driven fluid infiltration into porous media forms distinct pathways influenced by gravitational force. These fluid transport paths widen as gravity decreases, revealing an internal link-blob structure.

Area of Science:

  • Fluid dynamics
  • Porous media physics
  • Geosciences

Background:

  • Understanding unsaturated flow in porous media is crucial for various environmental and industrial applications.
  • Gravity significantly influences fluid transport mechanisms in porous materials.

Purpose of the Study:

  • To investigate the formation and characteristics of flow paths during gravity-driven infiltration of wetting fluids into porous media.
  • To analyze the impact of gravitational force strength on fluid transport pathways and instabilities.

Main Methods:

  • Utilized model experiments with a transparent, quasi-two-dimensional setup.
  • Employed numerical simulations coupling invasion percolation and viscous film flow models.

Main Results:

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  • Experimental and simulation results consistently showed that fluid pathways increase in width with decreasing gravitational force.
  • Observed an internal link-blob structure within the fluid pathways during infiltration.
  • Corroborated experimental findings with model simulations.

Conclusions:

  • Fluid pathway formation in porous media is strongly dependent on the balance between gravitational and capillary forces.
  • The observed link-blob structure and width variations provide insights into unsaturated flow dynamics.
  • The study successfully integrates experimental and modeling approaches to elucidate complex flow phenomena.