文献类型：期刊文献

中文题名：超细颗粒沉降过程数值模拟

英文题名：Numerical Simulation of Sedimentation Process of Superfine Particles

作者：周邵萍[1];王刚[1];洪磊[1];葛晓陵[1];李培宁[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237

年份：2006

卷号：32

期号：4

起止页码：484

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;EI(收录号：2006229913088);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：超细颗粒;沉降过程;模拟;团聚

外文关键词：superfine particles ; sedimentation process ; simulation ; aggregation

摘要：从单个颗粒运动轨迹出发,对存在团聚现象的颗粒沉降过程进行分析,建立了一个分析超细颗粒悬浮液沉降过程的数值模型,提出了加速沉降的促进函数Ψ,推导出沉降效率数值模型。并用M atlab程序对钛白去离子水体系分离模型进行了计算模拟,得出钛白悬浮液沉降过程有3个阶段:微观力影响与宏观力影响近似平衡的开始阶段,微观力影响占主导的沉降加速阶段,和两者达到新平衡的沉降后期状态。并讨论了颗粒含量和粒径对沉降过程的影响:颗粒含量的降低或是粒径的增大都将使沉降加速阶段时间跨度增加。
Based on trajectory analysis on individual particles settling in the vessel, an analytical model was developed on aggregation sedimentation of dispersed suspension of superfine particles. Promoting function ψ and sedimentation efficiency numerical model were put forward. Computer simulation was performed on the parameters of TiO2 suspension. Some useful conclusions were obtained, such as, there are three stages, the first balance stage, the second aceelerant sedimentation stage and the third new balance stage. Also the influences of the concentration and particle diameter on the sedimentation process were discussed. Concentration reducing and particle diameter decreasing will increase the time span of the sedimentation acceleration.