PULSED-FIELD GRADIENT NMR MEASUREMENTS OF PROBABILITY-DISTRIBUTION OFDISPLACEMENT UNDER FLOW IN SPHERE PACKINGS

In this work we used the PFG NMR displacement technique to investigate the transport of water particles under flow through a model porous me dia. Using different sizes of sphere for monodisperse glass sphere pac kings, we measured the probability distribution of displacement for me an displacements ranging from 0.08 to 7.3 times the characteristic len gth of the porous media, We observed, therefore, the transition betwee n the velocity probability distribution and the Gaussian-shaped distri bution of classical dispersion. Copyright (C) 1996 Elsevier Science In c.