Abstract
Developments in the movement of solids by liquids in pipelines are summarized with particular emphasis upon more recent work. In the case of Capsule transport there have been notable advances in understanding of the flow process and in data correlation. Thus it is now possible to predict energy consumptions, in some circumstances at least. For slurry transport the basic problem of predicting minimum operating velocities and energy consumptions still requires recourse to experiment or practical experience. Some theoretical progress has been made and there have been many interesting studies of other problems associated with operating slurry pipelines.

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