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Some remarkable observations of laboratory dispersion using computed tomography (CT). M.P. Walsh and E.M. Withjack. J. Can. Petrol. Technol., November 1994, 33(9), 36--44.

Fickian dispersion models are described for use in analysing undirectional, equal-viscosity, equal-density laboratory displacement tests. The technique is illustrated in mathematical terms. A permeability-variation dispersion model and a permeability-variation-plus-Fickian dispersion model are explained. Effects of system length, permeability variation, and scale-dependent dispersivities are discussed. Test results in Berea sandstone cores lead to new conclusions about flow in porous media. Mathematical modelling confirms that non-Fickian flow behaviour can be attributed to small but significant spatial permeability variations. New dispersion models are proposed for the analysis of dispersive flows. 28 refs.

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