Dynamics Simulation And Experimental Research Of The Electrorheological Fluid Based On Multipole Moment

Electrorheological(ER) fluids is a kind of Intelligent materials whichcomposition with small dielectric particles small particles which does not or weakconduct electricity and Insulating oil.Because of its viscosity which have excellentproperties such as fast response and reversible under external electric field，So receivemuch attentions of research workers. Accurate interpretation of the mechanism of theelectrorheological effect is always a issue which the researchers dedicated to the studyin this field. But， the research based on microscopic dynamics behavior ofelectrorheological fluids is rare,and more generally ignores multipole moment andparticle rotation effect, Special less consider the capture effect in the field ofdynamics. Based on multipole moment model and the capture effect, studied themovement law of electrorheological fluids under electric-heat-power-flow-andfield coupling load environment, derived the structure and force coupling equation（the correction multipole moment model） which considering the effect of particlerotation under multi-field coupling. Then,using the equation to doing the dynamicssimulation analysis of the electrorheological fluid； And tried to through thevisualization experiment to observe the microstructure evolution process ofelectrorheological fluid under multi-field coupling. Work for accurate interpretation ofthe electrorheological effect mechanism and formula design of electrorheologicalfluid has a certain significance.This paper mainly completed the following work.Firstly, making the simulation analysis of the local electric field between theparticles by matlab software, qualitative analysis the using range and defectsis of thepoint dipole moment model. presents two simplified calculation model of multipolemoment, analyzes the advantages and disadvantages of each; Computing anddiscussion the effect of Particle rotation on polarization force between particles andthe micro-structure of electrorheological fluid under Poiseuille flow field, Solution ofrotating impact factor of acting force between particles. provides a referencetheoretical foundation for the research of the electrorheological effect mechanismunder poiseuille flow fieldSecondly, the point dipole moment model and multipole moment model to makethe three-dimensional simulation of Electrorheological fluid dynamics；using thecorrection multipole moment model make the three-dimensional simulation ofElectrorheological fluid dynamics under the multi-field coupling. Using multipolemoment model to solve and obtain the precise dynamic yield stress expression ofelectrorheological fluids； And the influence on the yield stress ofelectrorheological fluids by the particle volume fraction are analyzedLastly， carry on the design and selection the experiment system ofElectrorheological fluids under the poiseuille flow field：equipped with two kinds ofelectrorheological fluid，testing the rheological properties of the electrorheologicalfluid through the MCR301rheometer. Observed The evolution process of thestructure of electrorheological fluid under the static field and poiseuille flow field， The experimental results has a certain guiding significance for future mechanism ofthe effect of electrorheological fluid.This research work relying on the project of the Nationl Natural ScienceFoundation (NO.51075345)...