Anisotropy of the magnetoviscous effect in a cobalt ferrofluid with strong interparticle interaction

Linke, Julia M.; Odenbach, Stefan

doi:10.1016/j.jmmm.2015.08.029

Cited by 14 publications

(14 citation statements)

References 33 publications

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“…For typical ferrofluids, this saturation is expected at field strengths of about 200–500 kA/m (see, for example, Figure 1 in [ 66 ]). However, the experiments presented in [ 67 , 68 , 69 , 70 , 71 , 72 ] demonstrate that the field-induced viscosity

can achieve an increase of two orders of magnitudes at the field about 100 kA/m. This is three to four orders of magnitude more than the predictions of models [ 40 ] of the single non-interacting particles.…”

Section: Chain-like Structures and Their Effect On Macroscopic Promentioning

confidence: 99%

“…The physical explanation of the strong magnetorheological effects in ferrofluids is given in [ 67 ]. The concept behind this explanation is that real ferrofluids are polydisperse systems, which very often have a wide distribution of particle sizes (corresponding diagrams for various ferrofluids can be found, for example, in [ 67 , 68 , 69 , 70 , 71 , 72 , 79 ]). As noted in the Introduction, the main part of the particles in typical ferrofluids is usually too small and unable to aggregate.…”

Section: Chain-like Structures and Their Effect On Macroscopic Promentioning

confidence: 99%

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Chain Formation and Phase Separation in Ferrofluids: The Influence on Viscous Properties

Иванов

Zubarev

2020

Materials

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Ferrofluids have attracted considerable interest from researchers and engineers due to their rich set of unique physical properties that are valuable for many industrial and biomedical applications. Many phenomena and features of ferrofluids’ behavior are determined by internal structural transformations in the ensembles of particles, which occur due to the magnetic interaction between the particles. An applied magnetic field induces formations, such as linear chains and bulk columns, that become elongated along the field. In turn, these structures dramatically change the rheological and other physical properties of these fluids. A deep and clear understanding of the main features and laws of the transformations is necessary for the understanding and explanation of the macroscopic properties and behavior of ferrofluids. In this paper, we present an overview of experimental and theoretical works on the internal transformations in these systems, as well as on the effect of the internal structures on the rheological effects in the fluids.

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Section: Chain-like Structures and Their Effect On Macroscopic Promentioning

confidence: 99%

Section: Chain-like Structures and Their Effect On Macroscopic Promentioning

confidence: 99%

Chain Formation and Phase Separation in Ferrofluids: The Influence on Viscous Properties

Иванов

Zubarev

2020

Materials

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“…Ms (here Ms is the spontaneous magnetization of the particle material) distribution of the spontaneously polarized particles [102][103][104][105][106] and estimate the dipole-dipole interaction parameter λ . One must take into account that the size of the magnetic core can be significantly smaller than the hydrodynamic diameter.…”

Section: Dimensional Analysismentioning

confidence: 99%

Self-assembly and rheology of dipolar colloids in simple shear studied using multi-particle collision dynamics

2017

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a Magnetic nanoparticles in a colloidal solution self-assemble in various aligned structures, which has a profound influence on the flow behavior. However, the precise role of the microstructure in the development of the rheological response has not been reliably quantified. We investigate the self-assembly of dipolar colloids in simple shear using hybrid molecular dynamics and multiparticle collision dynamics simulations with explicit coarse-grained hydrodynamics; conduct simulated rheometric studies and apply micromechanical models to produce master curves, showing evidence of the universality of the structural behavior governed by the competition of the bonding (dipolar) and erosive (thermal and/or hydrodynamic) stresses. The simulations display viscosity changes across several orders of magnitude in fair quantitative agreement with various literature sources, substantiating the universality of the approach, which seems to apply generally across vastly different length scales and a broad range of physical systems.

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“…Consider a ferrofluid, further parameters, such as the orientation of an applied magnetic field with respect to the fluid flow become important as this has crucial influence to the magnetoviscous effect in ferrofluids [26,6]. In general, any external applied magnetic field, independent of it's orientation, results in a stabilization of the basic state as well as shifting bifurcation thresholds for any flow structure [8,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Propagating vortices in ferrofluidic Couette flow under magnetic fields – Part I: Axial and symmetry breaking transversal orientated fields

Altmeyer

2021

Journal of Magnetism and Magnetic Materials

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Numerical investigations of propagating vortex states (pVs) for ferrofluidic Couette flow with small aspect ratio and fixed non-rotating end-walls are presented. We study structural modifications and changes in spatial and temporal behavior for pV solutions. The system is subjected to either pure axial or pure transverse magnetic field, with the latter already breaking the basic system symmetries. While under axial magnetic field pVs remain basically the same, they are found to appear in various configurations with different symmetry variation in flow structure and flow dynamics under symmetry breaking transversal magnetic field. pVs appearing in a pitchfork bifurcation are found either symmetric or asymmetric/alternating, regarding the full cycle of vortex generation, propagation and annihilation, in upper and lower system half.

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Anisotropy of the magnetoviscous effect in a cobalt ferrofluid with strong interparticle interaction

Cited by 14 publications

References 33 publications

Chain Formation and Phase Separation in Ferrofluids: The Influence on Viscous Properties

Chain Formation and Phase Separation in Ferrofluids: The Influence on Viscous Properties

Self-assembly and rheology of dipolar colloids in simple shear studied using multi-particle collision dynamics

Propagating vortices in ferrofluidic Couette flow under magnetic fields – Part I: Axial and symmetry breaking transversal orientated fields

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