水煤浆水平管内流动特性数值模拟

基于颗粒动理学理论，采用Eulerian多相流模型对水平管内水煤浆流动进行模拟，并采用RNG k-e湍流模型描述颗粒间具有强烈作用的两相湍流流动。将具有双峰分布特性的煤粉颗粒看作直径不同的 2 种固相，同时考虑固相与液相、固相与固相之间的动量交换。模型的有效性通过与计算相同条件下的压降试验值验证。在此基础上，通过模拟考察入口流速和浓度等因素对浓度分布、速度分布及压降的影响。结果表明：重力因素及不同颗粒相间的相互作用是影响颗粒相管内浓度分布和速度分布的根本原因。

Numerical Simulation of Coal-water Slurry Flow in Horizontal Pipelines

An Eulerian multi-fluid flow model based on kinetic theory of granular flow was developed to simulate flow pattern of coal-water slurry in horizontal pipelines. The RNG k-e turbulent model was incorporated in the governing equation to simulate turbulent two phase flow with strong interaction between particles. The coal particles with bimodal distribution were considered as two solid phase components and the momentum exchange between solid and liquid as well as between solid and solid are accounted for. The model was validated with pressure gradient data from experiments under operating conditions. The effects of inflow velocity and total concentration on particle concentration distribution, velocity distribution and pressure gradient were investigated. The results show that the gravitational force and the strong particle-particle interaction have significant effects on concentration distribution and velocity distribution profile.