Particle Dynamics of Polydisperse Magnetorheological Fluids

10.6493/SmartSci.2015.335

Chiranjit Sarkar；Harish Hirani

Magnetorheological fluids ； Particle dynamics ； Large size particles ； Small size particles ； Poly disperse particles ； Yield stress

Smart Science

3卷4期（2015 / 12 / 25）

176 - 187

英文

In the present research work, three dimensional simulations of magnetorheological fluids, containing soft magnetic polydisperse particles in silicone oil, has been presented. The computer simulation helps to visualize and analyze the formed transient microstructures. The initial positions of particle-centres were decided based on random distribution. The particle positions were updated considering magnetic, hydrodynamic and repulsions forces on each particle along with explicit time marching scheme. Finally the particle's positions at 10 ms have been plotted. The yield behaviors of MRFXXS (small sized: 2 to 33 μm) and MRFXXL (large sized: 45 to 212 μm) have been estimated using particle dynamic simulations and the predicted results have been compared with the results obtained from experiments. Due to large number of particles and limitations of computer hardware, the yield behavior of MRFXXM1 i.e. mixed (2 to 212 μm) sized magnetic particles could not be simulated. However, experiments were performed to investigate the yield behavior of MRFXXM1. The results show that MRFXXM1 is better than MRFXXS and MRFXXL.