PFG NMR measurements of flow through porous media: effects of spatial correlations of the magnetic field and the velocity field.
Used for a long time for diffusion studies, PFG NMR techniques are now widely used to study flow through porous media. We discuss here the effects of the magnetic field inhomogeneities and the finite gradient pulse duration in this case. We propose a statistical model based on spatial correlations of the magnetic field and velocity field and as far as we can, we draw practical conclusions on the PFG NMR measurements conditions.
Lebon
L
L
Laboratoire de Physique et Mécanique des Milieux Hétérogènes, UMR 7636 CNRS, ESPCI 10 rue Vauquelin, 75231 05, Paris cedex, France. lebon@pmmh.espci.fr
Leblond
J
J