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Electroosmotic Phenomena in Fractures.

Marino1, Coelho, Békri

  • 1IPGP, tour 24, 4, place Jussieu, Paris cedex 05, 75252, France

Journal of Colloid and Interface Science
|March 4, 2000
PubMed
Summary

This study reveals that fracture surface geometry significantly impacts electroosmotic phenomena. Fracture surface amplitude and roughness are key factors, leading to a unified relationship for electroosmotic coupling coefficients.

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Area of Science:

  • Geophysics
  • Fluid Mechanics
  • Surface Science

Background:

  • Electroosmotic phenomena are crucial in fluid transport through fractured media.
  • Understanding the influence of fracture geometry on these phenomena is essential for various applications.
  • Previous studies have explored electroosmosis in fractures, but a comprehensive analysis of geometric effects is lacking.

Purpose of the Study:

  • To systematically investigate the impact of geometrical parameters on electroosmotic phenomena in fractures.
  • To analyze the influence of surface amplitude and roughness (Hurst exponent) in self-affine fractures.
  • To develop a unified relationship for electroosmotic coupling coefficients based on a characteristic length scale.

Main Methods:

  • Numerical investigation of electroosmotic phenomena in the linear limit.
  • Systematic study of geometrical parameters for deterministic sinusoidal and random self-affine fractures.
  • Analysis of double-layer thicknesses and their effect on electroosmotic processes.

Main Results:

  • Fracture surface amplitude demonstrably influences electroosmotic processes.
  • For self-affine fractures, the Hurst exponent has a greater impact than the correlation parameter between surfaces.
  • A single relationship, dependent on a characteristic length scale (Lambda), unifies electroosmotic coupling coefficients across different fracture configurations.

Conclusions:

  • Fracture geometry, particularly surface amplitude and roughness, plays a critical role in electroosmotic phenomena.
  • The identified characteristic length scale provides a generalized approach to understanding electroosmotic coupling in fractures.
  • The derived relationship differs from that observed in porous media, highlighting unique aspects of fractured systems.

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