Derivation of Predicted Pressure Drop Equation on Granular Particle Plug Transportation in Horizontal Pipe

Abstract

In a plug transportation that is one of gas-solid two-phase flows, the prediction equations on particle velocity within a plug and pressure drop in a horizontal pipe have been formulated. The agreement between values calculated by these equations and experiments in which solid-air mass flow rate, pipe diameter, kinds of particle were changed was obtained. The difference between them is almost within 10%. In order to confirm the validity of supposition to derive these equations, particle velocity distribution within a plug in the directions of flow and radius, and particle velocity transformation from a stationary bed to a plug have been analyzed by high speed camera and PIV. The results show that there is no particle velocity distribution in a plug, and particles are accelerated uniformly in extra part of a plug. Namely, particles in a plug are fixed relative to each other and so they all move with the same velocity.