Study On Motion Characteristics Of Ferromagnetic Particles Based On Modified P-E Magnetization Model

Ferromagnetic particles are widely used in chemical industry,environmental protection,biochemical engineering,energy and other fields because of their ferromagnetism.Because of the penetrability of magnetic field,the movement state of particles in the system can be controlled by changing the magnetic field.In this paper,the movement of ferromagnetic particles in magnetic field is studied by numerical simulation,which provides reference for the application of ferromagnetic particles in magnetic field.The main contents of this paper are as follows:Firstly,based on the traditional magnetization model,a modified P-E magnetization model with wider application range is proposed by using the relative reference frame transformation method,which can calculate the magnetization force of ferromagnetic particles under the action of magnetic field in any direction.On this basis,a coupled simulation environment of finite volume method and discrete element particle element method is built,and the accuracy of the modified P-E magnetization model is verified.Secondly,the finite volume method is coupled with the discrete element particle element method to simulate the movement of ferromagnetic particles in the magnetic field.The influence of different magnetic field directions and different magnetic induction intensities on the movement of ferromagnetic particles is compared,and the analysis is made from three aspects: particle distribution,particle velocity vector and total energy change of particles.It is concluded that the chain direction of ferromagnetic particles in the magnetic field is consistent with the magnetic field direction,attracting each other along the magnetic field direction and repelling each other perpendicular to the magnetic field direction;Changing the magnetic induction intensity can appropriately alleviate the phenomenon of particle delamination.With the increase of magnetic induction intensity,the chain forming speed is faster and the time required to reach the stable state is shorter.Finally,the finite volume method is coupled with the discrete element particle element method to simulate the motion of multi-component particles in the magnetic field,and the influence of ferromagnetic particles and inert particles in different ratios under different magnetic field conditions is compared,which is also analyzed from three aspects.It is concluded that in multi-component particle system,ferromagnetic particles still maintain chain-forming characteristics,but chainforming speed and length decrease;When the proportion of ferromagnetic particles increases,the initial energy of ferromagnetic particles increases,the number and length of chains increase,and the ability to restrain inert particles increases When a magnetic field with inclination angle is applied,the time required for the ferromagnetic particles to reach a stable state gradually decreases with the increase of the proportion of ferromagnetic particles.The research contents and conclusions of this paper provide theoretical support for the motion law of ferromagnetic particles under the action of magnetic field,provide reference for the practical engineering process,and provide some ideas for further studying the motion of ferromagnetic particles in different magnetic fields.