关键词: 液固两相流, 正四面体颗粒, 运动特性, 速度分布, 浓度分布

Abstract:

In order to analyze the motion and distribution law of tetrahedral particle groups in liquid-solid two-phase flow in vertical uppipe, the effects of particle inlet concentration α(1%、2%、3%、4%、5%) and liquid inlet velocity u(1.0、1.2、1.5、1.8、2.0m/s) on the velocity and relative concentration distribution of particle groups in tubes were simulated based on CFD-DEM coupling method, and the accuracy of the numerical simulation is verified by PIV experiments. The results show that the particle group velocity fluctuates along the axial direction and decreases along the radial direction from the center to the wall of the tube within the range of research parameters. Along the radial direction, the relative concentration of particles follows the double peak law. Higher relative concentration of particles in the center of the tube and near the wall, while lower concentration in the transition region. When the particle inlet concentration is 1% and the liquid inlet flow rate is 2.0m/s, the particle concentration near the pipe wall is the highest.

Key words: liquid-solid two-phase flow, tetrahedral particles, motion characteristics, velocity distribution, concentration distribution