基于多场耦合提升逸散性颗粒与磁种碰撞系数动力学研究  

Dynamic study on enhancing the collision coefficient between fugitive particles and magnetic seeds based on multi-field coupling

作　　者：张俪安 杜传梅[1] 刁永发[2] 沈恒根[2] ZHANG Li-An;DU Chuan-Mei;DIAO Yong-Fa;SHEN Heng-Gen(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;School of Environmental Science and Engineering College,Dong Hua University,Shanghai 201620,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]东华大学环境科学与工程学院,上海201620

出　　处：《中国环境科学》2024年第9期4874-4882,共9页China Environmental Science

基　　金：安徽理工大学高层次引进人才科研启动基金资助(2023yjrc19);国家重点研发计划项目(2018YFC0705305)。

摘　　要：以多场耦合提升逸散性颗粒与磁种碰撞系数为研究对象,基于计算流体力学-离散相模型(DPM),通过用户自定义函数(UDF)添加逸散性颗粒与磁种之间的库仑力和磁偶极子力,数值计算电场和磁场构成的多场中逸散性颗粒与磁种之间的碰撞系数,获得提升磁凝并程度的方法.结果表明,当流体速度u=0.5m/s,颗粒粒径0.5μm≤d_(p)<2.0μm,库仑力和磁偶极子力均可提高逸散性颗粒与磁种之间的碰撞系数,且库仑力可弥补弱磁性颗粒与磁种之间磁偶极子力较小的问题.若荷电场强E_(0)=0.5kV/cm,逸散性颗粒饱和磁化强度M_(j)=500A/m,磁种饱和磁化强度M_(i)=40000A/m,逸散性颗粒与磁种之间的碰撞系数比未荷电时提高了13.50%,若荷电场强E_(0)=1.0kV/cm,碰撞系数提高了23.60%.This paper focuses on enhancing the collision coefficient between fugitive particles and magnetic seeds through multi-field coupling.Based on the computational fluid dynamics-discrete phase model (DPM),a user-defined function(UDF) was used to include the effects of the Coulomb force and magnetic dipole force acting on the fugitive particles.The collision coefficient between the fugitive particles and magnetic seeds in the multi-field formed by the electric and magnetic fields was numerically calculated,and the dynamic mechanism of enhancing the magnetic agglomeration process of particles was obtained.Simulations reveal that,for a fluid velocity of 0.5m/s and particle diameters ranging from 0.5μm to 2.0μm,both Coulomb and magnetic dipole forces enhanced the collision coefficient between the particles and magnetic seeds.Furthermore,the Coulomb force compensated for the problem that the magnetic dipole force between the weakly magnetic particles and the magnetic seeds was small.When the electric field strength(E_(0))was equal to 0.5kV/cm,the saturation magnetizationof fugitive particles(M_(j)) and magnetic seeds(M_(i)) were 500A/m and 40000A/m,respectively,the collision coefficient between fugitive particles and magnetic seeds was increased by 13.50%compared with that without charging.When the charge field strength(E_(0)) was equal to 1.0kV/cm,the collision coefficient was increased by 23.60%.

关 键 词：多场耦合 逸散性颗粒 磁种 碰撞系数 磁凝并 

分 类 号：X513[环境科学与工程—环境工程]