Two-phase flows by pulsed field gradient spin-echo NMR

Leblond, Jean-Baptiste; Benkedda, Y; Javelot, S.; Oger, Luc

doi:10.1088/0957-0233/5/4/017

Cited by 9 publications

(2 citation statements)

References 14 publications

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“…Although displacement measurements of various bulk flows have been conducted using MR techniques (e.g. as reviewed by Hemminga (1984), and conducted by Callaghan & Manz (1994) and Leblond et al (1994)), few studies applying PFG MR to measure time-dependent characteristics of flow and hydrodynamic dispersion of fluid in porous media have been reported. Here, we present a study of water flow and hydrodynamic dispersion in a column packed with glass beads, using bulk PFG stimulated-echo (STE) MR experiments for several dispersion times.…”

Section: Introductionmentioning

confidence: 99%

Study of flow and hydrodynamic dispersion in a porous medium using pulsed–field–gradient magnetic resonance

Amin

Gibbs

Chorley

et al. 1997

Proc. R. Soc. Lond. A

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This paper reports on the use of pulsed-field gradient (PFG) magnetic resonance (MR) techniques to obtain displacement and velocity spectra of steady-state, saturated flow through a column packed with glass beads. The displacement spectra obtained by PFG MR correspond to travel-distance probability-density functions (PDF) for initial conditions of a concentration impulse in a column with zero concentration. These spectra show strong dispersion-time dependence, and depart from Gaussian-shaped PDFs for short dispersion times. These data provide estimates of the dispersion-time dependence of transverse and longitudinal dispersion coefficients. The longitudinal dispersion coefficient reaches its long-time behaviour more slowly than the transverse coefficient; long-time values obtained from MR data agree well with those calculated using existing empirical correlations. A model based on three components of apparent velocities and dispersion coefficients is sufficient to describe the time dependence of displacement spectra for water flow through the bead column. The short-distance component arise because of convection-dispersion-diffusion processes within the narrow necks between particles. The long-distance component, on the other hand, represents a macroscopic convection-dispersion process. This study shows that PFG MR flow spectroscopy is a simple but potentially useful method for the investigation of flow and hydrodynamic dispersion in porous media, especially for time-dependent phenomena.

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