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Related Experiment Videos

Colloid dispersion in a uniform-aperture fracture.

Marissa D Reno1, Scott C James, Susan J Altman

  • 1Sandia National Laboratories, Geohydrology Department, P.O. Box 5800, Albuquerque, NM 87185-0735, USA. mdreno@sandia.gov

Journal of Colloid and Interface Science
|April 25, 2006
PubMed
Summary
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Colloid transport in fractures shows increased plume tailing due to Taylor dispersion. Effective dispersion rates correlate linearly with a dimensionless number based on colloid size, flow rate, and fracture length.

Area of Science:

  • Environmental Science
  • Geosciences
  • Chemical Engineering

Background:

  • Colloid transport in fractured media is crucial for understanding contaminant migration and resource recovery.
  • Fracture systems present complex flow paths that significantly influence particle movement.
  • Previous studies often simplified fracture geometry or neglected colloid-specific transport phenomena.

Purpose of the Study:

  • To experimentally and numerically investigate colloid dispersion in synthetic fractures.
  • To quantify the relationship between colloid dispersion and key experimental parameters.
  • To analyze the role of Taylor dispersion in colloid transport through fractures.

Main Methods:

  • Utilized fluorescent microspheres (1.0, 0.11, 0.043 µm) and chloride as tracers in Plexiglas flow cells.

Related Experiment Videos

  • Varied colloid size, flow rate, and fracture length to alter a dimensionless experimental parameter.
  • Employed a particle-tracking algorithm inversely to estimate effective dispersion rates.

    • Main Results:

    • Observed full colloid recovery, indicating negligible filtration and remobilization due to repulsive surface interactions.
    • Colloid plumes exhibited increased tailing compared to chloride, attributed to Taylor dispersion.
    • Effective colloid dispersion rates increased linearly with the logarithm of the dimensionless experimental number.

    Conclusions:

    • Taylor dispersion significantly impacts colloid transport in fractures, though fully developed conditions were not met.
    • The effective dispersion rate is predictable based on colloid size, flow rate, and fracture length.
    • Repulsive surface forces minimize colloid loss, allowing for accurate transport studies in synthetic fractures.