Simulation Studies On Dynamic Characteristics Of Electrorheological Fluids Under Multi-field Coupling

Electrorheological (ER) fluids is a kind of intelligent liquid materials, because ofits mesoscopic, the research of its dynamics is still concerned. However,at the earlystudy on dynamics of ER fluids, it is rarely considered the kinetic research undermulti-field coupling, in particular, they havn’t found capture effect in the process ofER response. This paper relying on the project of the National Natural ScienceFoundation (No.51075345), based on the multi-field coupling effect andelectrodynamics theory, analysis of characterizing caputer effect when ER fluids flewthrough the control field, investigated the flow characteristics of ER fluids underelectric-power-heat-flow coupling load environment, study of the kinetics equationand dynamics characteristics of ER fluids under multi-field coupling throughtheoretical modeling and numerical sumulation.Firstly, based on electrodynamics theory, analyzed characterizing caputer effectwhen ER fluids flew under coupling field, derived to the structure and force ofdynamic coupling equation of ER fluids under multi-field coupling; and based on N-Sequation, and combined with exploring structrue-force coupling equation, study of thecoupling dynamic model under electric field and Poiseuille flow. Using moleculardynamics method, study of potential function of ER fluids, coupling dynamicdimensionless equation, Velocity-Verlet numerial algorithm, initial and periodicboundary conditions, integration step size and truncation radius, and analysis of theaverage shear stress formula of ER fluids under multi-field coupling. Numericalsimulation on evolution process of microstructrue of ER fluids under single field andmulti-field coupling effect, and analysis dynamic mechanical properties of ER fluidsin the process of dynamic response, exploring the coupling relationship with structurechange and dynamic characteristics; study and discuss the Mn number and volumefraction influence of the chain struture and dynamic mechanical properties of ERfluids under coupling filed.Research shows that: at the multi-field coupling effect, ER fluids pass by thechange from chain-body centered cubic-lamellar structure, induced by structure-forcedynamic coupling, the characterization of the establishment of coupling dynamicsmodel of ER fluids and the use of molecular dynamics method can satisfy numericalanalysis; in addition, Mn number and volume fraction affect on coupling ofmicroscopic structure and dynamic characteristic of ER fluids is obvious. This paper research work is from the point of dynamics complementary interpretation of theelectrotheological effect mechanism theory, it has positive role in seeking the rightformula design of ER fluids and reasonable engineering applications.