A multi-particle sedimentation stability investigation of magnetorheological fluid using the DEM

She, Na; Chen, Bingsan; Lu, Minrui; Xu, Yongchao; Peng, Xiaodong; Hung, Shangchao

doi:10.1007/s13367-023-00080-z

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…However, the density of the magnetic particles is about 7 times bigger than the carrier fluid, the magnetic particles settle in the carrier fluid (Kaide et al, 2020;Su et al, 2020;Maurya and Sarkar, 2021;Zhu et al, 2021). When the magnetorheological device stops working, the sedimentation of magnetic particles is difficult to avoid (Aruna et al, 2019;Cheng et al, 2021a;She et al, 2023). The sedimentation and agglomeration of magnetic particles will directly affect the performance of MRFs, so it is very important to study the sedimentation stability of MRFs for magnetorheological device.…”

Section: Introductionmentioning

confidence: 99%

Study on sedimentation stability of silicone oil-based magnetorheological fluids with fumed silica as additive

Yu,

Chen,

2024

Front. Mater.

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In order to study the sedimentation stability of silicone oil-based magnetorheological fluids with fumed silica as additive, magnetorheological fluids with different mass fractions of fumed silica, particle sizes of carbonyl iron powder and viscosities of silicone oil were prepared. The sedimentation rate of magnetorheological fluids was calculated by observation method, and the zero-field viscosity of magnetorheological fluids was measured by viscometer. The results show that the sedimentation rate and viscosity of magnetorheological fluids increase gradually with the increase of the mass fraction of fumed silica. The mass fraction of fumed silica should not be constant for magnetorheological fluids, but should be determined according to the content of silicone oil in magnetorheological fluids. With the increase of average diameter of carbonyl iron powder, the sedimentation stability of magnetorheological fluids becomes worse. With the increase of viscosity of silicone oil, the sedimentation stability of magnetorheological fluids does not increase significantly. However, the high viscosity of silicone oil will result in wall hanging phenomenon, and increase the start-up difficulty of magnetorheological device. With 2.5 wt% of fumed silica for silicone oil, the magnetorheological fluids has good sedimentation stability and suitable zero-field viscosity.

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Section: Introductionmentioning

confidence: 99%

Study on sedimentation stability of silicone oil-based magnetorheological fluids with fumed silica as additive

Yu,

Chen,

2024

Front. Mater.

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Sensing method on magnetorheological fluid concentration and in-situ settlement monitoring based on wire wound inductor

An,

Zou,

Zhang

et al. 2024

Journal of Intelligent Material Systems and Structures

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Aiming at the limitations of magnetorheological fluid (MRF) settlement monitoring in transparent non-metallic containers, a method of MRF concentration measurement based on a wire wound inductor is proposed in this paper, and with the sensing method, in-situ monitoring of MRF sedimentation inside the damper is fulfilled. The varying local concentration of MRF will lead to the inductance change of the wire wound inductor, which is immersed in the MRF at a specific position, with the settling process. When harmonically excited with a signal generator, the relationship between the output amplitude across the inductor and the MRF concentration can be established. To reveal the settling speed dependence, the monitoring of the MRF settling is carried out with different concentrations and viscosities. It is testified that the proposed method can measure the concentration of MRF effectively, and is qualified with the in-situ monitoring of the MRF settling in a real damper.

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Tribological and rheological properties of magnetorheological fluids: a comparative study of different carbonyl iron powders

Yu,

Chen,

2024

Journal of Intelligent Material Systems and Structures

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Rheological property is very important for magnetorheological fluids, but tribological property also is a crucial factor to determine whether magnetorheological fluids can work stably. In order to find suitable carbonyl iron powder for magnetorheological fluids, three magnetorheological fluids are prepared by ordinary, reduced, and phosphated carbonyl iron powders, and their properties are compared. The microstructures of the different carbonyl iron powders are observed by scanning electron microscopy and X-ray diffraction. Sedimentation stability of the magnetorheological fluids is obtained by observation. The tribological and rheological properties are measured by friction testing machine and rotational rheometer. The results show that MRF-pho have superior tribological property and sedimentation stability, MRF-ord have higher shear yield stress, MRF-red have better comprehensive properties.

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A multi-particle sedimentation stability investigation of magnetorheological fluid using the DEM

Cited by 3 publications

References 33 publications

Study on sedimentation stability of silicone oil-based magnetorheological fluids with fumed silica as additive

Study on sedimentation stability of silicone oil-based magnetorheological fluids with fumed silica as additive

Sensing method on magnetorheological fluid concentration and in-situ settlement monitoring based on wire wound inductor

Tribological and rheological properties of magnetorheological fluids: a comparative study of different carbonyl iron powders

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