磁场对磁性湿颗粒运动机理的影响  

Influence of magnetic field on movement mechanism of wet magnetic particles

作　　者：毛志[1,2] 谭诗德 柯春海 袁海专 MAO Zhi;TAN Shide;KE Chunhai;YUAN Haizhuan(School of Mathematics and Computational Science,Xiangtan University,Xiangtan 411105,Hunan,P.R.China;School of Data Science,Tongren University,Tongren 554300,Guizhou,P.R.China)

机构地区：[1]湘潭大学数学与计算科学学院,湖南湘潭411105 [2]铜仁学院大数据学院,贵州铜仁554300

出　　处：《重庆大学学报（自然科学版）》2018年第8期17-25,共9页Journal of Chongqing University

基　　金：中国博士后科学基金面上资助项目(2017M623074);湖南省教育厅科学研究项目(17C1528);贵州省科技合作计划项目(黔科合LH字[2015]7247号);贵州省教育厅创新群体重大研究项目(黔教合KY字[2016]051);铜仁学院2015年度第二批博士科研启动基金项目(trxyDH1526)~~

摘　　要：为了了解磁流化床内磁性湿颗粒的运动特性,数值模拟了匀强磁场作用下磁性湿颗粒的运动。数学模型上,采用离散元法(DEM)模拟颗粒运动,同时考虑磁场和液桥的双作用力模型。仅针对二维溃坝问题进行数值模拟,分别研究磁场和液桥对颗粒行为的影响。数值模拟结果发现:无磁场作用时,液体体积分数增加,颗粒运动剧烈程度相对减弱,颗粒聚集行为增强;有磁场作用时,颗粒形成平行于磁感线方向的链,显著降低了颗粒的平均速度和平均位移。To understand the movement behavior of wet magnetic particles in magnetic fluidized beds, the numerical simulations of wet magnetic particles movement under effect of uniform magnetic field are performed. In the mathematical model, the discrete element method （DEM） is adopted to simulate the particles movement, while both magnetic force and liquid bridge force models are considered. A two- dimensional dam-break problem is simulated to observe the effects of magnet-field and liquid bridge on the behavior of particles motion. Theresults show that： without magnet-field, as liquid-volume friction increasing, the speeds of particles become slowly and the particles are gathered obviously. When a magnet-field is applied, the particles form some chains parallel to the direction of magnetic sense, which reduce the average velocity and displacement of particles.

关 键 词：磁性颗粒 液桥力 磁场 离散元法 溃坝问题 

分 类 号：O359.2[理学—流体力学] TQ051.1[理学—力学]