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Related Experiment Videos

Spatial dependence of dispersion.

Alexandre A Khrapitchev1, P T Callaghan

  • 1School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand.

Magnetic Resonance Imaging
|July 10, 2003
PubMed
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Pulsed Gradient Spin Echo (PGSE) NMR can now measure velocity fluctuations and dispersion in porous media. This advanced technique provides detailed insights into fluid flow dynamics within complex materials.

Area of Science:

  • Physics
  • Physical Chemistry
  • Fluid Dynamics

Background:

  • Pulsed Gradient Spin Echo (PGSE) Nuclear Magnetic Resonance (NMR) is a standard technique for studying fluid flow in porous media.
  • Analyzing velocity fluctuations requires advanced NMR methods beyond basic PGSE.

Purpose of the Study:

  • To adapt and apply PGSE NMR for analyzing velocity fluctuations in porous media flow.
  • To measure the asymptotic dispersion coefficient and Velocity Auto-Correlation Function (VACF).
  • To perform localized measurements of flow dispersion.

Main Methods:

  • Utilizing two pairs of position-encoding pulses within the PGSE NMR experiment.
  • Comparing displacements during two distinct encoding intervals to detect velocity fluctuations.
  • Generating two-dimensional maps of density and velocity distributions.

Related Experiment Videos

Main Results:

  • Demonstrated the capability of the modified PGSE NMR method to examine velocity fluctuations.
  • Successfully measured the asymptotic dispersion coefficient and VACF.
  • Presented the first localized measurements of flow dispersion in porous media.

Conclusions:

  • The adapted PGSE NMR technique is effective for characterizing complex flow behaviors in porous media.
  • This method enhances the understanding of fluid transport at a localized level.
  • The study provides a foundation for more detailed investigations into porous media hydrodynamics.