Rheological properties and stability of magnetorheological fluids using viscoelastic medium and nanoadditives

Optimal Design Methodology of Magnetorheological Fluid Based Mechanisms

“…However, when the particles settled down, the fieldinduced particle chains formed incompletely at best in which MR response was critically degraded. Later, in order to prevent further sedimentation, new compositions of MRF with consideration on viscoplastic [11] and viscoelastic continuous phases [12] were formulated, so that the stability could be improved immensely. In addition, a composite MRF has been prepared by Pan et al [13] with a combination of iron particles powder, gelatine and carrier fluids.…”

“…For MR valve with two coils, the pressure drop is calculated by 12 (37) where ∆P2A, τ and ∆P2A, η are the field-dependent and viscous pressure drop of the two-coil annular MR valve respectively, τy1 and τy2 are the yield stresses of the MRF in the end ducts and the middle duct, respectively. c1 and c2 are coefficient which depends on flow velocity profile of MR flow in the end ducts and the middle duct, respectively.…”

Influence of Oleic and Lauric Acid on the Stability of Magnetorheological Fluids

“…It is difficult to prevent sedimentation in MRFs, and great efforts have been made to this end [12]. In general, surfactants and additives have been introduced to reduce particle sedimentation and to improve the stability of the MRFs [13][14][15][16]. For instance, different annexing agents, such as lauric acid, stearic acid, oleic acid and sodium dodecyl benzene sulfonate, have been introduced to improve the hydrophobic property of the surface of the particles, and particles coated with a polymer have been observed to have a reduced density [17,18].…”

Effect of Magnetic Nanoparticle Additive on Characteristics of Magnetorheological Fluid

“…MR fluid is a suspension of magnetically susceptible particle dispersed in a carrier fluid such as mineral oil and silicone oil [1], [6]- [8]. In the absence of an external magnetic field strength, the magnetizable particles are randomly distributed and MR fluids behave similarly to Newtonian fluid [5].…”

“…Particles for MR fluids should be magnetized under an external magnetic field, indicating that ferromagnetic materials can be used as a disperse phase of MR fluid [14]. However, it is well known that the soft magnetic materials, which are easy to magnetize and demagnetize, are superior to hard magnetic materials due to the ability to control the rheological properties of MR fluids by tuning the external field [6], [15], [16]. Carbonyl iron (CI) is widely used as magnetizable particles for the MR fluids due to its high magnetic permeability, soft magnetic characteristics and common availability.…”