Abstract
The development and application of plug flow of solids in pipelines first occurred in the mid 70's. This flow is also termed dense phase flow or pulse-piston flow since the plugs are somewhat like moving packed beds and the operation is usually carried out with a plug of solids and a plug of air all conveyed at low velocities. This study addresses the entire system operating with distinct pulse-piston behaviors which determine the appropriate pipe diameters for a given solids capacity and fixed amount of energy. A development is presented for the minimum plug length utilizing the basic characteristics of the powder. A case study of an existing pipeline and desired capacity is presented with determination of the energy requirements for a particular transport line. Both impermeable and permeable plugs are considered.
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