Abstract
This study investigates the velocity and pressure distributions of gas flow field in a vertical screw conveyor through EDEM simulation. Results show that the vertical velocity of gas is the highest and that the minimum pressure is negative, which is at the exit, thereby aiding in the upward transportation of particles. The particle state in the vertical screw conveyor is obtained without considering gas (EDEM simulation) and by considering gas (EDEM + FLUENT simulation), respectively. Investigation of the relationship among the screw critical speed, screw diameter, and particle size shows that the conditions of gas–solid two-phase flow form in the vertical screw conveyor. A test is designed to verify the correctness of the conclusions. The results of this study lay a foundation for the development of design methods based on gas–solid two-phase flow in a vertical screw conveyor.
Highlights
A vertical screw conveyor is a continuous conveying machinery that is mainly used for ascension of dispersed particles at a short range
The particle state in the vertical screw conveyor is obtained without considering gas (EDEM simulation) and by considering gas (EDEM + FLUENT simulation), respectively
We need to consider the role of gas affecting particles, whose simulation is more accurate by EDEM + FLUENT simulation, thereby verifying the validity of the screw critical speed for formula (7)
Summary
A vertical screw conveyor is a continuous conveying machinery that is mainly used for ascension of dispersed particles at a short range. The traditional screw conveying mechanism is used only to clarify some forces’ (friction force of gravity and centrifugal force) spiral vane acted on dispersed particles.[5] studies do not mention particles that can form gas– solid two-phase flow under the action of high-speed rotating screw. On the basis of the analysis of the velocity and pressure distributions of gas phase flow, the gas phase flow in the vertical screw conveyor is conducive to the upward transportation of particles
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