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

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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≤ dp <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E₀=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E₀=1.0kV/cm,碰撞系数提高了23.60%.

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	张俪安
	杜传梅
	刁永发
	沈恒根

关键词 ：多场耦合, 逸散性颗粒, 磁种, 碰撞系数, 磁凝并

Abstract：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(E₀) 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(E₀) was equal to 1.0kV/cm, the collision coefficient was increased by 23.60%.

Key words： multi-field coupling fugitive particles magnetic seeds collision coefficient magnetic agglomeration

收稿日期: 2024-02-01

PACS:

X513

基金资助: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)

通讯作者: 张俪安,讲师,zhangli_an0927@163.com E-mail: zhangli_an0927@163.com

作者简介: 张俪安(1990-),男,安徽淮北人,讲师,博士,主要从事工业烟气PM_2.5控制技术理论研究.发表论文8篇.zhangli_an0927@163.com.

引用本文:

张俪安, 杜传梅, 刁永发, 沈恒根. 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[J]. 中国环境科学, 2024, 44(9): 4874-4882. ZHANG Li-An, DU Chuan-Mei, DIAO Yong-Fa, SHEN Heng-Gen. Dynamic study on enhancing the collision coefficient between fugitive particles and magnetic seeds based on multi-field coupling. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 4874-4882.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I9/4874

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