细颗粒在粗糙管壁管道内运动特性的研究  

Research on Flow and Deposition Characteristics of Fine Particles in Rough Narrow Channels

作　　者：林达平[1] 周涛[1] 李精精[1] 杨旭[1] 汝小龙[1] 

机构地区：[1]华北电力大学核热工安全与标准化研究所,北京102206

出　　处：《动力工程学报》2015年第5期424-428,共5页Journal of Chinese Society of Power Engineering

基　　金：教育部博士点基金资助项目(200800791005);中国核动力院反应堆系统设计国家重点实验室资助项目(2013-49);中国核动力研究设计院二所资助项目(2013-07)

摘　　要：基于1 000mm×20mm×20mm的窄矩形通道,利用Fluent软件模拟细颗粒在管道内流动时的运动特性,并通过对比粗糙管道和光滑管道,得到了粗糙度对管道内温度场的影响以及细颗粒在窄矩形通道内的质量浓度分布和速度分布.结果表明:当存在温度梯度的情况下,细颗粒会在管壁处发生沉积,粗糙度会增大靠近管壁处的温度梯度,增强管壁附近的热泳效应和湍流效应,从而促进细颗粒在管壁附近的富集.Numerical simulation was conducted to flow characteristics of fine particles in the 1 000mm×20mm×20mm narrow channel respectively with rough and smooth inner surface using Fluent software,so as to study the influence of inner surface roughness on the temperature field,and to analyze the concentration and velocity distribution in the narrow channel.Results show that fine particles will deposit on the wall when temperature gradient exists in the channel;with the rise of surface roughness,the temperature gradient near channel wall increases,which will enhance the thermophoretic and turbulent effect,and therefore promote the gathering of fine particles in the area near channel wall.

关 键 词：细颗粒 窄矩形通道 粗糙度 沉积 

分 类 号：TQ055.81[化学工程]