Dynamic study on enhancing the collision coefficient between fugitive particles and magnetic seeds based on multi-field coupling
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(Mj)and magnetic seeds(Mi)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%.
万方数据
维普
