Abstract
Abstract
In this paper, based on the accumulation pattern of particles flowing through the bend, the Dunes are designed to be placed in curves with different radii of curvature in a horizontal-vertical pneumatic conveying system, and the movement characteristics of the particles entering the vertical pipeline due to with Dunes are analyzed based on CFD-DEM. Compared to the case of No Dune, the Gas-solid two-phase velocities with Dune are almost evenly distributed in the pipe and are larger than the corresponding case of No Dune. At the same time, the particle axial velocities with Dunes are larger than the case without Dunes, the number of collisions of particles in vertical tubes is reduced due to Dunes, and the particles diverge sufficiently throughout the vertical tube from the particle flow patterns. The results show the effect of Dunes can increase the velocity of particles and reduce the impact of particles on the pipe wall, it is conducive to the transport of particles. Meanwhile, The experiment known as particle image velocimetry (PIV) verifies the accuracy of the numerical simulation results.