Abstract
As is well known, it is the uniformity of the liquid distribution at the base of a solid—liquid fluidized bed which mainly determines its structural quality and, in particular, whether or not channelling occurs. In this paper a precise description is given of the relationship between efficiency in the distribution of the liquid and the phenomenon of axial liquid dispersion in the bed. When the mixing is inadequate, there are significant discrepancies in measurements of the coefficient of axial dispersion and of the Péclet number, depending on whether these are obtained in a channel region or elsewhere. This is clearly one of the reasons for the considerable variation in results obtained by previous authors, whose reports seldom include exact descriptions of the hydrodynamic properties of the fluidized beds studied.
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