Concentration and velocity field measurements by magnetic resonance imaging in aperiodic heterogeneous porous media

Magnetic resonance imaging (MRI) techniques were investigated asa means to obtain concentration and velocity field measurements for the verification o f a stochastic model for conservative chemical transport. MRI techniques we re successfully applied to obtain one-dimensional breakthrough images and t wo-dimensional velocity images along the length of an aperiodic heterogeneo us porous medium. Experimental moment data showed the concentration field i n the experimental model to be slightly positively skewed. Velocity images showed the velocity field to be relatively uniform with no channeling or pr eferential flow behavior. Measured covariance functions showed evidence of negative correlation in the velocity field. The detailed spatial informatio n provided by these imaging experiments has demonstrated that MRT is a valu able tool for obtaining experimental data for the verification of existing theoretical models. (C) 1999 Elsevier Science Inc.