垂直管道颗粒及颗粒群沉降运动规律研究

Study on the settling regularity of solid particles in vertical pipelines

沉降运动是固液两相流基础的相对运动形式。垂直管道水力输送紧急停泵状态下,颗粒群体沉降很容易造成管道堵塞。本文进行了单颗粒、均匀颗粒和非均匀颗粒群体三种沉降试验,分析了浓度、级配、粒径、边界条件等因素对颗粒及颗粒群沉降速度的影响,对粗颗粒在管道中的沉降运动规律进行了探索。

Settling movement is a basic relative motion form in solid-liquid two phase flow.The pipeline blockage can be easily caused by group settling in the case of emergency pump shut-down for vertical pipe hydraulic transportation.Based on three kinds of settlement experiments-single particle,uniform group particles and non-uniform group particles,this article analyzed the influence of factors such as particle concentration,size gradation,diameter and boundary conditions of pipes on single and group settling velocity.It also explored on the regularity of coarse particle settling in vertical pipelines.