Magnetorheological properties of ferrofluids containing clustered particles

Abstract

Abstract-A theoretical model is proposed to describe experimental data on the magnetorheological prop erties of magnetic fluids containing clustered particles consisting of single domain ferromagnetic nanoparti cles distributed in a polymeric shell 80-100 nm in diameter. These fluids combine the sedimentation stability typical of nanodisperse ferrofluids with the high sensitivity of rheological parameters to magnetic fields. The developed model explains the experimentally found long term rheological relaxation and residual stress that is retained after the medium ceases to flow. DOI: 10.1134/S1061933X13050190 D d

Study on the Rheological Properties and Shear Model for Magneto-Rheological Fluids

“…MRFs exhibit low-viscosity, Newtonian fluid characteristics in a zero magnetic field and high-viscosity, low-fluidity Bingham characteristics in a strong magnetic field. This change is continuous and reversible with a response time of only a few tens of milliseconds [1,2]. Because they are continuous, reversible, fast-moving and easily controlled, MRFs can be designed and manufactured as magneto-rheological dampers, clutches and other intelligent devices that can be applied to earthquake prevention in civil engineering, to semi-active control of vehicle suspension systems and to other fields [3,4].…”