Simulation of dilute pneumatic conveying with different types of bends by CFD-DEM

27th IAHR Symposium on Hydraulic Machinery and Systems

Du, J.^1 ; Hu, G.M.^1 ; Fang, Z.Q.^1 ; Wang, J.^1

School of Power and Mechanical Engineering, Wuhan University, Wuhan

430072, China^1

关键词: Effect of voids;    Gas-solid flow structure;    Gas-solid flows;    ITS applications;    Particle-wall collision;    Pneumatic conveying;    Pneumatic conveying system;    Time consumption;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/22/5/052004/pdf
DOI  :  10.1088/1755-1315/22/5/052004

来源: IOP

【 摘 要 】

Bends are one of the most commonly used facilities to change flow direction in pneumatic conveying. It is important to understand the effect of the bend to the gas-solid flow structures in a pneumatic conveying system. CFD-DEM is one of powerful methods to study the fundamentals of gas-solid flow, as it takes the particle-particle and particle-wall collisions into account. But the time consumption is one of major limitations for its application. In this paper, a three-dimensional CFD-DEM model which ignores the effect of void fraction to the gas phase is used to simulate the dilute gas-solid flow. Gas-solid flows in different types of bends including horizontal-vertical, vertical-horizontal and horizontal-horizontal 90° bends are studied. The present CFD-DEM model is verified by compared the rope structure with the result for traditional CFD-DEM model in horizontal-vertical case. Compared the particle rope dispersion in different types of bends, the rope disperses more quickly in the vertical-horizontal case than others, and the solid flow structure is the most complicated in the horizontal- horizontal case. As their various solid flow structures, the collision data of three cases also seem different.