Molecular Dynamics Simulations Of Poiseuille Flow Meter And Multi-body Interactions

Electrorheological fluids (ER fluids) are finely dispersed suspensions of fine solid particles of high dielectric constant into insulating oil of low dielectric constant and its mechanical property (viscosity, shear stress, etc) can be continuously controlled by external electric field. Poiseuille flow is an important operation mode of ER fluids, which is widely employed in the design of ER devices, for example ER dampers, ER clutches, hydro-valves, etc. This paper makes a general survey of the history and present situation of ERF researches in the fields of physical mechanism, materials, performances, applications, etc. Then it concentrates on the molecular dynamic simulation of Poiseuille flow of ER fluids. The details are as follows, Firstly, by introducing the equivalent plate conduction model to substitute the hemisphere conduction model of ER fluids, this paper sets up the formula of interactions of multi-particles in different 2-d and 3 -d structures, which simplifies the computation greatly. Secondly, by applying the equivalent plate conduction model to the molecular simulation of Poiseuille flow of ER fluids, this paper obtains the 2-d velocity and displacement profiles of different external pressure and explains the existence of transition zone. Thirdly, considering interactions of multi-particles in 3d structure, this paper gets the 3-d evolving process of velocity profiles and structure of particles. Fourthly, taking into account the effect of inertia term in the ER fluids of high volume concentration, this paper simulates the Poiseuille flow of ER fluids and gains profiles of different inertia coefficient. Lastly, this paper designs and makes a device to observe the Poiseuille flow of ER fluids, the phenomena are in accordance with simulation results.