Rheological properties of water-based<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si37.gif" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:math>ferrofluids

Hong, Ruoyu; Ren, Zhongqi; Han, Y.P.; Li, H.Z.; Zheng, Ying; Ding, Jing

doi:10.1016/j.ces.2007.06.010

Cited by 129 publications

(57 citation statements)

References 60 publications

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“…When the shear rate increased, particles started to arrange their orientation along the direction of shear, which led to a decrease in viscosity. 36 However, in the presence of a magnetic eld, the viscosity of FF, MRF and sample 'C' increased and also demonstrated shear thinning behaviour. A similar trend has been observed for F-MRFs samples A, B and C. It is assumed that at low shear rate magnetically induced chain clusters sustain their existence due to dominant magnetic interactions while at high shear rate these structures break down and uid starts to ow.…”

Section: Rheological and Viscoelastic Measurementsmentioning

confidence: 99%

An improved properties of bidispersed magneto-rheological fluids

et al. 2014

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We have investigated the influence of nanosized particle concentration on rheological properties when mixed with a magnetorheological (MR) fluid. We have also studied the structural, morphological and magnetic properties of ferrofluid-based MR fluids (F-MRFs). Field-induced rheological and viscoelastic properties of F-MRFs with varying shear rate and strain amplitude have been investigated. The HerschelBulkley model was found to fit well with the flow behaviour of F-MRFs. In the oscillatory strain sweep test, F-MRFs show linear viscoelasticity at low strain and the storage modulus (G 0 ) is higher than the viscous modulus (G 00 ), which indicates the existence of strong links among the particles that form the microscopic structures. The storage modulus increases with increasing weight fraction of nanosized particles. Furthermore, the loss factor (ratio of G 00 and G 0 ) was also investigated as a function of magnetic field strength. In addition, time-dependent relaxation behaviour of magnetically induced chain-like structures has also been described. The study reveals that the addition of nanoparticles to MR fluids increases the viscosity as well as the fluid stability under a magnetic field.

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Section: Rheological and Viscoelastic Measurementsmentioning

confidence: 99%

An improved properties of bidispersed magneto-rheological fluids

et al. 2014

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“…According to the study of Hong et al [18], magnetite nanoparticles have a density of Let us consider a magnetic field produced by a long thin straight electrical wire running in the y-direction. The magnetic field strength H  of an arbitrary electrical conduit may be calculated using the Biot-Savart equation:…”

Section: Cellular Flow In Magnetic Fieldmentioning

confidence: 99%

Numerical Simulation of Particle Movement in Cellular Flows under the Influence of Magnetic Forces

Ravnik¹,

Hriberšek²,

Vogel³

et al. 2014

Int. j. simul. model.

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A numerical model of particle motion in fluid flow under the influence of hydrodynamic and magnetic forces is presented. The Lagrangian particle tracking algorithm was developed being capable of simulating dilute suspensions of particles in viscous flows where gravity, buoyancy, drag, pressure gradient, added mass and magnetophoretic forces are taken into account. The method is used to study the behaviour of magnetite particles in a periodic cellular flow field under the influence of a magnetic field produced by electric wires placed in cell centres. For such a flow field it is known that particles in steady state merge into individual trajectories. The influence of the magnetic field on the particle trajectories is examined and an exponential model for the time evolution of the fraction of adhered particles to the electric wires is proposed. Three particle Stokes number values are considered: 0.01, 0.1 and 1. The existence of a critical magnetic pressure coefficient was found, at which all particles end up to be adhered to the wires. The critical magnetic pressure coefficient was found to be proportional to the Stokes number. For sub-critical magnetic pressure coefficient, the particle trajectories are significantly altered by the magnetic field, both in their shape and in their number. Furthermore, in the sub-critical regime, the minimal distance of particles to the cell centres is larger for particles with smaller Stokes numbers.

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“…T h e m a g n e t i c f l u i d demonstrated superior stability, and had susceptibility of 7.78×10 -4 and saturation magnetization of 27.3 emu/g. The rheological property [19] of the prepared magnetic fluid was investigated using a rotating rheometer attached with a custom-built solenoid coil. It was found that the viscosity of the magnetic fluid increased with the increasing intensity of magnetic field, and the magnetic fluid demonstrated shear-thinning behavior and could be described by the Herschel-Bulkey model.…”

Section: Surface Modification Of Fe 3 O 4 Nanoparticlesmentioning

confidence: 99%