Stabilization and tribological properties of magnetorheological (MR) fluids: A review

Sehgal, Rakesh; Wàňi, M.F.; Sharma, Mukund Dutt

doi:10.1016/j.jmmm.2021.168295

Cited by 43 publications

(26 citation statements)

References 131 publications

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“…The temperature of the magnetic fluid at the divergent wedge is higher than that of the convergent wedge [32]. It can be seen that the temperature of the magnetic fluid drops particularly fast on both sides of the axial side of the evanescent wedge, mainly because the magnetic fluid is in the small mouth of the evanescent wedge and out of the large mouth, the flow rate is reduced, and the magnetic fluid has a certain viscosity, the flow rate of the magnetic fluid on both sides of the axial side is smaller [33], the heat dissipation time is longer and the temperature is particularly low. The reasons for cavitation are mainly two factors of temperature and pressure.…”

Section: Flow Field Analysis Of Magneto-fluid Lubricated Bearingsmentioning

confidence: 92%

Structural Design and Lubrication Properties under Different Eccentricity of Magnetic Fluid Bearings

Wang

Pan

et al. 2022

Applied Sciences

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As a lubricant, the viscosity of the magnetic fluid changes with the external magnetic field, which improves the bearing capacity of the oil film and hence the lubrication effect, and has a promising application in bearings. Based on the Roelands viscosity theory, the Shliomis model is used to derive the viscous temperature, viscous pressure, and magnetic viscosity characteristics of magnetic fluids under the influence of an applied magnetic field, and further proposes a structural model of magnetic fluid lubricated bearings to investigate the pressure, temperature and magnetic intensity distribution of magnetic fluids under different eccentricity conditions. The results show that the viscosity of the magnetic fluid decreases exponentially with increasing temperature, rises linearly with increasing pressure, and increases and stabilizes with increasing magnetic induction strength. Because the minimum film thickness point is the dividing point between the convergent wedge and the dispersed wedge, the pressure distribution of the lubricant film separates high pressure from low pressure at the minimum film thickness, and the differential pressure increases with the increase in eccentricity. The temperature distribution of the high-temperature zone is mainly distributed in the middle of the film, and the minimum film thickness zone and the maximum temperature increases with the increase in eccentricity. The magnetic intensity distribution of the strong magnetic field is mainly concentrated in the minimum film thickness zone, and the magnetic induction intensity increases with the increase in eccentricity. The results of this study have certain research significance for solving the problem of the poor lubrication effect of bearing lubricant due to high temperature.

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Section: Flow Field Analysis Of Magneto-fluid Lubricated Bearingsmentioning

confidence: 92%

Structural Design and Lubrication Properties under Different Eccentricity of Magnetic Fluid Bearings

Wang

Pan

et al. 2022

Applied Sciences

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“…[1][2][3] Under an external magnetic field, the particles would attract each other due to the dipolar force, and a chain-like microstructure would form, and the MRFs would transform from a fluid-like state to a solid-like state, accompanied by a sharp increase of viscosity and shear stress by several orders of magnitude in a few milliseconds, which is called the magnetorheological (MR) effect. [4][5][6] Because of the excellent rheological and mechanical properties, MRFs have a wide range of applications in aerospace, mechanical engineering, medical engineering, and other fields, such as dampers, brakes, clutches, magnetic resonance imaging materials, and lower limb prostheses. [7][8][9][10][11][12][13] Shear stress is an important index to evaluate the rheological properties of an MRF, as well as the influencing factor, and has been studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Mechanism analysis of the carrier viscosity effect on shear stress of magnetorheological fluids

Zhuang

Song

et al. 2022

Soft Matter

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“…Compared with carbonyl iron (CI) particles, metals (Fe, Zn, Ni, and Co) and their oxides with suitable diameters are more typically used in MRFs that require high dispersion stability. 21,22 In particular, iron oxide (Fe 3 O 4 ) with various shapes (triangular, 23 fibrous, 24 rod, 25 nanowire, 26 spherical, 27 etc.) has been widely studied in MRF materials owing to their suitable magnetization, adjustable morphology, and easy synthesis or modification routes.…”

Section: Introductionmentioning

confidence: 99%

“…Submicron‐ or nanoscale magnetic particles are believed to show better stability in nonmagnetic carrier fluids than micron‐scale particles due to Brownian movements and Van der Waals forces. Compared with carbonyl iron (CI) particles, metals (Fe, Zn, Ni, and Co) and their oxides with suitable diameters are more typically used in MRFs that require high dispersion stability 21,22 . In particular, iron oxide (Fe 3 O 4 ) with various shapes (triangular, 23 fibrous, 24 rod, 25 nanowire, 26 spherical, 27 etc.)…”

Section: Introductionmentioning

confidence: 99%

Core/shell magnetite/copolymer composite nanoparticles enabling highly stable magnetorheological response

Han

Wang

Rui

et al. 2022

Int Journal of Mech Sys Dyn

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Magnetorheological fluids (MRFs) have been successfully used in a variety of smart control systems, but are still limited due to their relatively poor settling stability. Herein, a core/shell-structured Fe 3 O 4 /copolymer composite nanoparticle is synthesized as a new candidate material for stimulus-responsive MRFs to tackle the limitation of the long-term dispersion stability. Aniline-co-diphenylamine copolymers (PANI-co-PDPA) are loaded onto the surface of Fe 3 O 4 nanoparticles, providing a lighter density and sufficient active interface for the dispersion of magnetic particles in the carrier medium. The features of the Fe 3 O 4 /copolymer composite nanoparticles, including morphology, compositional, and crystalline properties, are characterized. An MRF is prepared by suspending Fe 3 O 4 /copolymer composite nanoparticles in a nonmagnetic medium oil, and its rheological properties are assessed using a controlled shear rate test and dynamic oscillation tests using a rotational rheometer. Rheological models including the Bingham model and the Herschel-Bulkley model are fitted to the flow curves of the MRF. The obtained Fe 3 O 4 /copolymer composite shows soft-magnetic properties, as well as greater density adaptability and higher stability, compared to Fe 3 O 4 . Moreover, the sedimentation testing provides information about the dispersion stability characteristics of MRF and shows a good correlation with high-stability magnetorheological (MR) response. The Fe 3 O 4 /copolymer-based MRF with a tunable and instantaneous MR response is considered a promising material for smart control applications.

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Stabilization and tribological properties of magnetorheological (MR) fluids: A review

Cited by 43 publications

References 131 publications

Structural Design and Lubrication Properties under Different Eccentricity of Magnetic Fluid Bearings

Structural Design and Lubrication Properties under Different Eccentricity of Magnetic Fluid Bearings

Mechanism analysis of the carrier viscosity effect on shear stress of magnetorheological fluids

Core/shell magnetite/copolymer composite nanoparticles enabling highly stable magnetorheological response

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