Modelling Solids Friction Factor for Dense-Phase Pneumatic Conveying of Powders

摘要

This paper presents results from an investigation into power-function modelling of solidsfriction factor for the dilute-phase and fluidised dense-phase (FDP) conveying of powders.Three different diameters/lengths of pipeline were used to generate a wide range of steadystatedata and also explore important scale-up issues. The effect of pressure tapping locationson the data and derived models was also investigated. Different sets of power-function modelsolutions were used for comparison purposes and also to check scale-up stability andaccuracy. Comparisons with predictions from recent models developed by other researchersare included.It is concluded that certain forms of the power function model are more stable (in terms ofscale-up) than others. The paper also demonstrates how existing models can becomeunreliable or unstable under certain scale-up conditions and discusses possible causes of suchproblems.