Vertical Pneumatic Conveying Using Four Hydrodynamic Models

Abstract

Pressure drop in vertical transport of solids was calculated using four hydrodynamic models previously proposed. The calculations were done using literature correlations of friction factors. Three of the models predict a minimum in pressure drop vs. superficial gas velocity. The three models - a relative velocity model, a model with pressure drop in the gas and solid phases, and a model with a pressure drop in the gas phase only - predict a choking behavior associated with flow reversal of particles. The relative velocity model compares well with Zenz's experimental data with a fixed inlet volume fraction.