化工学报Issue(z1)：54-59,6.DOI:10.11949/j.issn.0438-1157.20170513
小管径-粒径比颗粒无序堆积通道内壁面效应数值研究
Numerical simulation of wall effect in randomly packed bed with low tube to particle diameter ratio
摘要
Abstract
The wall effect in randomly packed bed with low tube to particle ratio is numerically investigated by coupling discrete element method (DEM) and computational fluid dynamics (CFD).The porosity,characteristics of fluid flow and heat transfer in randomly packed beds are carefully studied,including smooth tube wall model and corrugated tube wall model.Simulation results show that,the wall effect in smooth wall packing with low tube to particle diameter ratio is remarkable.The average velocity of the near tube wall region is higher than inner region,while the average temperature of this region is lower.Besides,the mass flow rate in the range of 0.5dp near the tube wall is about 46% of the total flow.With corrugated structure,the leakage near the tube wall is suppressed and the mass flow rate decreases to 36%.The heat transfer characteristics and drag coefficient have a slight increase,while the overall heat transfer coefficient is lower than smooth tube wall model.关键词
颗粒无序堆积/离散元/壁面效应/流动/传热/数值模拟Key words
randomly packed bed/DEM/wall effect/flow/heat transfer/numerical simulation分类
能源科技引用本文复制引用
胡映学,周浪,杨剑,王秋旺..小管径-粒径比颗粒无序堆积通道内壁面效应数值研究[J].化工学报,2017,(z1):54-59,6.基金项目
国家自然科学基金项目(51476124,51536007).supported by the National Natural Science Foundation of China (51476124,51536007). （51476124,51536007）
