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Fluid flow in porous systems

P Mansfield1, M Bencsik

  • 1Department of Physics, University of Nottingham, UK.

Magnetic Resonance Imaging
|November 6, 1998
PubMed
Summary
This summary is machine-generated.

Nuclear magnetic resonance (NMR) measurements reveal water flow variance in glass bead packs is proportional to mean velocity. This finding aligns with the Mansfield-Issa equation and suggests coherence effects in the bead system.

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Area of Science:

  • Physics
  • Engineering
  • Materials Science

Background:

  • Understanding fluid flow through porous media is crucial in various scientific and engineering fields.
  • Nuclear Magnetic Resonance (NMR) offers non-invasive methods for fluid dynamics analysis.
  • Previous models have explored fluid flow behavior in granular systems.

Purpose of the Study:

  • To investigate water velocity profiles in a 10 mm glass bead pack using NMR.
  • To validate the Mansfield-Issa equation under experimental conditions.
  • To explore coherence effects in porous media connectivity.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR) with a phi echo-planar imaging (PEPI) sequence.
  • Conducted measurements across various water flow rates.

Related Experiment Videos

  • Analyzed velocity distributions and variance-to-velocity relationships.

    • Main Results:

    • Observed a proportional relationship between flow variance and mean flow velocity, consistent with the Mansfield-Issa equation.
    • Determined that velocity distributions were approximately Gaussian.
    • Identified coherence effects in the glass bead system's connectivity based on slice thickness variations.

    Conclusions:

    • The study confirms the Mansfield-Issa equation's applicability to water flow in bead packs.
    • Coherence effects in porous media connectivity were observed and potentially explained by an extended intervoxel coupling model.