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Hydrodynamic dispersion of noncolloidal suspensions: Measurement from Einstein's argument.

Following Einsteins's argument for the diffusion coefficient of colloidal dispersions, we postulate that the steady state concentration profile in a suspension of noncolloidal monodisperse particles reflects the dynamic equilibrium resulting from a balance between gravity-driven convection and hydrodynamic dispersion. Using an acoustic technique, the steady state concentration profile of a counterflow-stabilized suspension (a fluidized bed) as well as stationary propagating sedimentation fronts inside the bed were determined. From these profiles we can derive the concentration dependence of the hydrodynamic dispersion coefficient.