Magnetic permeability of inverse ferrofluid emulsion: Nonlinear ferrofluid magnetization law

Subbotin, I. M.

doi:10.1016/j.jmmm.2020.166524

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…Refs. [48,49]), the formation of chained structures of ferrofluid droplets, [50] and the effect of these structures on the emulsion electrical properties [51]. Finally, it is worth mentioning the recent work of Zakinyan and Zakinyan [52] who succeed on producing an emulsion of ferrofluid microdrops using a rotating magnetic field and showed that the resulting magnetic torque of the emulsion can be enhanced with respect that observable in the pure ferrofluid.…”

Section: Introductionmentioning

confidence: 97%

Shear rheology of a dilute emulsion of ferrofluid droplets dispersed in a nonmagnetizable carrier fluid under the influence of a uniform magnetic field

Capobianchi

Lappa

Oliveira

et al. 2021

Journal of Rheology

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The effect of a spatially uniform magnetic field on the shear rheology of a dilute emulsion of monodispersed ferrofluid droplets, immersed in a non-magnetizable immiscible fluid, is investigated using direct numerical simulations. The direction of the applied magnetic field is normal to the shear flow direction. The droplets extra stress tensor arising from the presence of interfacial forces of magnetic nature is modeled on the basis of the seminal work of G. K. Batchelor, J. Fluid Mech., 41.3 (1970) under the assumptions of a linearly magnetizable ferrofluid phase and negligible inertia. The results show that even relatively small magnetic fields can have significant consequences on the rheological properties of the emulsion due to the magnetic forces that contribute to deform and orient the droplets towards the direction of the applied magnetic vector. In particular, we have observed an increase of the effective (bulk) viscosity and a reversal of the sign of the two normal stress differences with respect to the case without magnetic field for those conditions where the magnetic force prevails over the shearing force. Comparisons between the results of our model with a direct integration of the viscous stress have provided an indication of its reliability to predict the effective viscosity of the suspension. Moreover, this latter quantity has been found to behave as a monotonic increasing function of the applied magnetic field for constant shearing flows ("magneto-thickening" behaviour), which allowed us to infer a simple constitutive equation describing the emulsion viscosity.

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Section: Introductionmentioning

confidence: 97%

Shear rheology of a dilute emulsion of ferrofluid droplets dispersed in a nonmagnetizable carrier fluid under the influence of a uniform magnetic field

Capobianchi

Lappa

Oliveira

et al. 2021

Journal of Rheology

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show abstract

“…These works indicated fundamental similarities and profound differences between MMNPs and droplets in ferrofluid emulsions. [56][57][58] The similarities stem from the demagnetising effects, while the differences arise due to the spatial constraints. The latter is related to the fact that the MMNP grains are fixed in space and can only move together with the MMNP in contrast to ferroparticles in droplets that can freely diffuse inside.…”

Section: Introductionmentioning

confidence: 99%

Multicore-based ferrofluids in zero field: initial magnetic susceptibility and self-assembly mechanisms

et al. 2023

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Rotating field induced torque on ferrofluid emulsion with deformable dispersed phase microdrops

Zakinyan

2020

Sensors and Actuators A: Physical

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Magnetic permeability of inverse ferrofluid emulsion: Nonlinear ferrofluid magnetization law

Cited by 5 publications

References 11 publications

Shear rheology of a dilute emulsion of ferrofluid droplets dispersed in a nonmagnetizable carrier fluid under the influence of a uniform magnetic field

Shear rheology of a dilute emulsion of ferrofluid droplets dispersed in a nonmagnetizable carrier fluid under the influence of a uniform magnetic field

Multicore-based ferrofluids in zero field: initial magnetic susceptibility and self-assembly mechanisms

Rotating field induced torque on ferrofluid emulsion with deformable dispersed phase microdrops

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