| With the in-depth application of particle controllable technology in the fields of biopharmaceuticals,chemical engineering,electro-optical sensing,and the popularization of magnetic field control methods,the study of the motion law of magnetic particles under the action of a magnetic field has attracted great attention.Under the action of an external magnetic field,the soft magnetic particles will respond instantaneously to the magnetic field and move under the action of the magnetic field.The laws of physics governing these processes are well described in the literature.However,when magnetic particles move in a Newtonian fluid,particles with different initial distances interact differently,resulting in different motion laws.However,most of the previous studies focused on the macroscopic properties or chain formation mechanism of magnetic particles,and few people studied the microscopic mechanism or control mechanism of magnetic particle repulsion and separation.Therefore,based on the motion theory of magnetic particles in Newtonian fluid,this paper studies the motion law of the contact and separation of two circular magnetic particles in Newtonian fluid.particle method.The work presented here provides insights into understanding the interactions between magnetic particles in static fluids,details the effect of an applied magnetic field on magnetic particles in close proximity,and develops a set of efficient controls for two circular magnetic particles.Methods.The research content of this paper includes:(1)The research background of the paper is reviewed,and the research significance of this paper is proposed.The development status of the controllable technology of magnetic particles and the research status of magnetic particles moving in Newtonian fluids at home and abroad are analyzed.Theory,Maxwell Theory)were reviewed.(2)Based on Maxwell’s theory,the theoretical model of magnetic particles in Newtonian fluids is established,and the interaction mechanism between particles and particles,particles and magnetic fields,and particles and flow fields is analyzed,and the magnetic force,fluid force,contact model and equation of motion are established..The simulation process and method are described,and the magnetization of a single magnetic particle is simulated and analyzed.(3)The motion law of magnetic particles in static fluid under the action of uniform magnetic field is simulated and analyzed.It mainly includes the analysis of the influence law of different initial distances and angles on the motion trajectory of magnetic particles,and focuses on the dynamic law of magnetic particles in the process of repulsion and the influence of external conditions on magnetic particles.,and finally the motion law of the contacting magnetic particles under the action of the vertical magnetic field is discussed.A magnetic source device for generating a uniform magnetic field: a yoke-type electromagnet was developed,and various performances of the electromagnet were verified by simulation experiments,and an observation platform based on the design of the electromagnet was established.and conclusions.(4)The feasibility of separating magnetic particles under the action of rotating magnetic field is studied.The motion state of the magnetic particle chain under the rotating magnetic field is simulated.The theoretical model of the magnetic particle chain under the action of rotating magnetic field is established,and the mechanism of the breaking and recombination of the magnetic particle chain is analyzed.The motion law of magnetic particles with different initial distances under the action of rotating magnetic field,and the dynamic characteristics of magnetic particles with different Mersenne numbers are studied.(5)The motion law of magnetic particles in dynamic fluid is simulated and analyzed.Firstly,the dynamic fluid is selected based on different modes of the fluid,and then the motion of magnetic particles in the dynamic fluid without the action of a magnetic field is simulated,and the motion of magnetic particles with different initial distances and contact states in the fluid channel is analyzed.Finally,based on the motion law of magnetic particles in the fluid channel without the action of a magnetic field,a method to effectively control the magnetic particles by a magnetic field is proposed. |
