CFD-DEM modelling of hydraulic conveying of solid particles in a vertical pipe
CFD-DEM modelling of hydraulic conveying of solid particles in a vertical pipe
复制标题
DOI：
10.1016/j.powtec.2019.07.015
复制
发表时间：
2019-09
影响因子：
5.2
通讯作者：
Mengmeng Zhou;Shuai Wang;S. Kuang;K. Luo;Jianren Fan;A. Yu
中科院分区：
文献类型：
--
作者：
Mengmeng Zhou;Shuai Wang;S. Kuang;K. Luo;Jianren Fan;A. Yu
本文采用计算流体力学（CFD）和离散元法（DEM）相结合的方法，对粗颗粒水力输送进行了数值研究。通过模型验证，证明了采用CFD-DEM方法模拟该流动系统的合理性，其中需要考虑作用在颗粒上的升力。数值结果表明，颗粒在垂直管道的中部有集中的趋势。提高进料固体浓度和输送速度，使颗粒分布更加分散，并导致压降增加。相比之下，颗粒直径对瞬时流态和压降的影响可以忽略不计。在所考虑的所有操作条件下，时间平均变量，包括固体体积分数，轴向液体速度，轴向固体速度都呈现最大值在管道的中间，这逐渐下降，在径向方向上的壁。这些结果对水力输送的优化具有一定的指导意义。
This paper presents a numerical study of hydraulic conveying of coarse solid particles by means of the combined approach of Computational Fluid Dynamics (CFD) for the liquid phase and Discrete Element Method (DEM) for particles. Via the model validation, it proves the reasonability of applying the CFD-DEM method in the simulation of this flow system, where the lift force acting on a particle needs to be considered. Numerical results show that particles tend to concentrate in the middle of the vertical pipe. Increasing feed solid concentration and conveying speed gives a more dispersed distribution of particles and leads to an increase of pressure drop. In contrast, particle diameter has a negligible influence on instantaneous flow regimes and pressure drop. Under all the operating conditions considered, time-averaged variables including solid volume fraction, axial liquid velocity, and axial solid velocity all present maximum values in the middle of the pipe, which decline gradually in the radial direction toward the wall. These results are expected to shed light on the optimization of hydraulic conveying.