排灌机械工程学报2017，Vol.35Issue(5)：404-409,6.DOI:10.3969/j.issn.1674-8530.16.0077
基于DEM的流化床气固两相流瞬态数值模拟与验证
DEM-based numerical simulation of unsteady gas-solid two phase flow in a fluidized bed and experimental validation
摘要
Abstract
The Euler-Lagrange method based DEM (discrete element method) was used to simulate the unsteady gas-solid two phase flow in the initial stage of three-dimensional bubbling fluidized bed to break the bottle-neck in the Euler-Euler model in which the force of particle collisions is not taken into account.Based on experimental observations made by high speed photographic technique in the initial stage of flow in the fluidized bed,a comparison was conducted between experiment and si-mulation in terms of changes in bed height,bubble size and particle phase motion characteristics.In the initial stage,the predicted results are in good agreement with the experimental data,particularly,the predicted height of bed and the shape of bubbles are basically the same as the measurements.Unfortunately,at a time moment near the bubble breakup,the predicted bubble diameter and height of bed are smaller than the experimental measurements.However,from the point of view of both fluid flow pattern and particle motion trajectory,DEM can solve the dense two-phase flow accurately,and can describe the dynamic characteristics of a gas solid fluidized bed.The results presented in this study have important significance in guiding engineering practice.关键词
流化床/离散元法模型/气固两相流/多相交互作用/数值模拟/试验研究Key words
fluidized bed/DEM model/gas-solid two phase flow/multiphase interaction/numerical simulation/experimental study分类
农业科技引用本文复制引用
施卫东,张铃杰,周岭,陆伟刚..基于DEM的流化床气固两相流瞬态数值模拟与验证[J].排灌机械工程学报,2017,35(5):404-409,6.基金项目
中国博士后科学基金资助项目(2015M581737) （2015M581737）
江苏省自然科学基金青年基金资助项目(BK20150508) （BK20150508）
