A Review of the State of the Art in Magnetorheological Fluid Technologies         - Part I: MR fluid and MR fluid models

Goncalves, Fernando D.; Koo, Jeong‐Hoi; Ahmadian, Mehdi

doi:10.1177/0583102406065099

Cited by 125 publications

(86 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Upon applying a uniform field, isotropic magnetic particles form linear chain structures due to magnetic interactions among the particles [16,17]. Janus magnetic particles, meanwhile, form chiral chains, staggered chains, or doubled chain-like structures as well as linear chain structures, depending on their internal structure [9,[18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Magnetic interaction of Janus magnetic particles suspended in a viscous fluid

et al. 2016

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Magnetic interaction of Janus magnetic particles suspended in a viscous fluid

et al. 2016

View full text Add to dashboard Cite

“…Magnetorheological (MR) fluids, consisting of tiny magnetizable particles suspended in a non-magnetic medium, are widely used in many industrial applications such as brakes, dampers, actuators, etc. 1,2 Rapid response to the magnetic field applied externally makes MR fluids an attractive means for the devices. Recently, magnetic particles are also employed in microfluidic systems for chemical or biological applications by which our research is motivated.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of magnetic chains in a shear flow under the influence of a uniform magnetic field

2012

View full text Add to dashboard Cite

Travelling waves in a cylindrical magnetohydrodynamically forced flow Phys. Fluids 24, 044101 (2012) Two-dimensional numerical analysis of electroconvection in a dielectric liquid subjected to strong unipolar injection Phys. Fluids 24, 037102 (2012) We numerically investigate dynamics of magnetic chains and flow characteristics in a two-dimensional shear flow under the influence of a magnetic field applied externally. A direct simulation method is employed to solve the particulate flow in the creeping flow regime, taking into account both magnetic and hydrodynamic interactions in a coupled manner. In a periodic channel, the dynamics of chains is found to be significantly influenced by the Mason number (the ratio of viscous force to magnetic force), the magnetic susceptibility, and the particle fraction. Below a critical Mason number, a chain rotates and reaches an equilibrium. Above the critical value, however, the chain continuously rotates as a rigid body. Thinning behavior in the wall shear stress is found above a threshold value of the Mason number.

show abstract

“…Increasing the concentration of magnetic particles generally enhances the rheological response of MR fluids to an applied magnetic field (Goncalves et al 2006). For this reason, volume fractions in commercial applications are often as high as 40 to 50 v% (Jolly et al 1999), despite the fact that increased concentrations of magnetic particles also result in an elevated off-state viscosity.…”

Section: Effect Of Magnetic Particle Concentrationmentioning

confidence: 99%

“…The tunability of rheological properties with the applied magnetic field provides the basis for a wide variety of commercial applications of MR fluids, including automobile clutches (Rabinow 1948), active dampers (Spencer et al 1997), seismic vibration control (Dyke et al 1996), prosthetics (Carlson et al 2001), precision polishing (Kordonski and Golini 1999), and drilling fluids (Zitha 2004). MR fluid research and technology has been reviewed numerous times, with articles focusing on rheology and flow properties (de Vicente et al 2011a), models and mechanisms of chain-formation (Parthasarathy and Klingenberg 1996;Goncalves et al 2006), MR fluid formulation (Park et al 2010), and applications (Klingenberg 2001;Olabi and Grunwald 2007).…”

Section: Introductionmentioning

confidence: 99%

Magnetorheology in an aging, yield stress matrix fluid

2012

View full text Add to dashboard Cite

Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite ® clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up to 1 T and magnetic particle concentrations up to 30 v%. The yield stress of the matrix fluid, which serves to inhibit sedimentation of dispersed carbonyl iron magnetic microparticles, is found to have a negligible effect on the field-induced static yield stress for sufficient applied fields, and good agreement is observed between field-induced static and dynamic yield stresses for all but the lowest field strengths and particle concentrations. These results, which generally imply a dominance of inter-particle dipolar interactions over the matrix fluid yield stress, are analyzed by considering a dimensionless magnetic yield parameter that quantifies the balance of stresses on particles. By characterizing the applied magnetic field in terms of the average particle magnetization, a rheological master curve is generated for the fieldinduced static yield stress that indicates a concentration-magnetization superposition. The results presented herein will provide guidance to formulators of MR fluids and designers of MR devices who require a field-induced static yield stress and a dispersion that is essentially indefinitely stable to sedimentation.

show abstract

A Review of the State of the Art in Magnetorheological Fluid Technologies - Part I: MR fluid and MR fluid models

Cited by 125 publications

References 0 publications

Magnetic interaction of Janus magnetic particles suspended in a viscous fluid

Magnetic interaction of Janus magnetic particles suspended in a viscous fluid

Dynamics of magnetic chains in a shear flow under the influence of a uniform magnetic field

Magnetorheology in an aging, yield stress matrix fluid

Contact Info

Product

Resources

About