MEASUREMENT OF INTERACTIVE SURFACE FORCE OF SUSPENDED PARTICLES IN ER AND MR SUSPENSIONS UNDER ELECTRIC AND MAGNETIC FIELD

Abstract

Interactive surface force between each particle in suspension is very important to explain the dispersion and flocculation phenomena in fluid. The new equipment has been developed to measure the interactive surface force of particles, which was calculated by using Derjaguin's formula, in Electro-Rheological (ER) Fluid and Magneto-Rheological (MR) Suspensions/fluids under electric and magnetic fields, respectively. Firstly, the interactive force of particles in ER fluid dispersed by melamine particles under electric fields was measured. Secondly, the interactive force of particles in MR suspensions dispersed by carbonyl iron particles under magnetic field was investigated. Considering the measurement of interactive surface force of ER and MR fluids, they have a original characteristic frequency due to the attractive and repulsive force of particles interactions initiated by the electric, magnetic and compressive force. Moreover, clusters formed according to the size of particles, particles movement model and formation are estimated by the characteristic frequency of ER fluid and MR suspensions under various electrical and magnetic fields. It indicates that these estimation models might be lead to the interaction kinetics of suspended particles in ER/MR under electrical and magnetic fields.