Particle-scale modeling study of coaxial jets of gas-solid swirling flow in an industrial-scale annular pipe via CFD-DEM

作者：Zhanghao Wan, Shiliang Yang, Duzuo Tang, Haibin Yuan, Jianhang Hu, Hua Wang · 发表于：Powder Technology · 年份：2023 · DOI：10.1016/j.powtec.2023.118307 · 被引用次数：19 · 研究领域：Particle Dynamics in Fluid Flows、Cyclone Separators and Fluid Dynamics、Granular flow and fluidized beds

In this work, the gas-solid swirling flow characteristics of coaxial jets in an industrial-scale annular pipe with a helical swirler is numerically simulated via the CFD-DEM. After validating the numerical model, the general flow pattern of coaxial jets, and gas-particle mixing behavior together with the particle-scale information are discussed. The effect of the geometry parameters of the swirler is studied and analyzed in terms of particle azimuthal velocity and particle Reynolds number . The results demonstrate that the presence of the swirler enhances both the turbulent disturbance and gas vorticity. Increasing vane angle and diameter of swirler is beneficial for the particle dispersion . The particle velocity slightly reduces with decreasing the height in the region 0.6 m < H < 0.7 m but dramatically increases with decreasing the height in the region of height H < 0.6 m. The entrainment of particles by the swirling flow increases the distribution width and azimuthal velocity of particles with decreasing the height.