Numerical algorithm for analyzing the magnetic fluid seals

Park, Gwan Soo; Kim, Dong-Hun; Hahn, Song–Yop; Lee, Ki-Sik

doi:10.1109/20.312656

Cited by 19 publications

(1 citation statement)

References 4 publications

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“…The solution of a diffusion equation of ferrite particles in a magnetic field could theoretically explain the experimental results. Park et al [114] adopted iterative computation in numerical algorithm to obtain the boundary surface configurations of MFSs. Bonvouloir [115] found that the ratio of magnetic force to centrifugal force, a dimensionless number, was not a good predictor of high-speed seal failure.…”

Section: Magnetic Fluid Rotary Sealingmentioning

confidence: 99%

Theory analyses and applications of magnetic fluids in sealing

et al. 2023

Friction

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Magnetic fluids are the suspensions composed of magnetic nanoparticles, surfactants, and non-magnetic carrier liquids. Magnetic fluids are widely used in various fields, especially in sealing, because of their excellent features, including rapid magnetic response, flexible flow ability, tunable magneto-viscous effect, and reliable self-repairing capability. Here, we provide an in-depth, comprehensive insight into the theoretical analyses and diverse applications of magnetic fluids in sealing from three categories: static sealing, rotary sealing, and reciprocating sealing. We summarize the magnetic fluid sealing mechanisms and the development of magnetic fluid seals from 1960s to the present, particularly focusing on the recent progress of magnetic fluid seals. Although magnetic fluid sealing technology has been commercialized and industrialized, many difficulties still exist in its applications. At the end of the review, the present challenges and future prospects in the progress of magnetic fluid seals are also outlined.

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Section: Magnetic Fluid Rotary Sealingmentioning

confidence: 99%

Theory analyses and applications of magnetic fluids in sealing

et al. 2023

Friction

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A study of the torque characteristics of small disk brake using magnetic fluid

Bae

Park

2011

J Mech Sci Technol

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A magnetic fluid simultaneously has hydrodynamic and electromagnetic properties because its characteristics depend on whether a magnetic field is applied or not. The studies conducted so far on actuators that use a magnetic fluid are insufficient. A magnetic fluid has an added advantage in that it can be applied to small or micro systems because of its nanoscale particle size. Therefore, this research investigated the braking characteristics of a small disk brake that used a magnetic fluid. First, magnetostatic analysis of the magnetic field produced by a permanent magnet was conducted, and then, the pressure distribution in the magnetic acted upon by the magnetic body force from the permanent magnet was analyzed using the governing equations of a magnetic fluid. So, in this research, the torque characteristic of small disk brake by a magnetic body force was studied through the relation between the magnetic field intensity and rotational disk velocity. In addition, the torque characteristics of the brake due to a magnetization of the magnetic fluid were confirmed experimentally.

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Seals Based on Magnetic Fluids for High Precision Spindles of Machine Tools

Urreta¹,

Aguirre²,

Kuzhir

et al. 2018

Int. J. Precis. Eng. Manuf.

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The research work reported in this paper is focused on the use of magnetic fluids as active elements in seals for improving sealing capacity and minimizing friction torque, with application to the spindles of high precision machine tools. The prototype design was optimized following numerical computation of the magnetic field in the rings of the seal. Two magnetic fluids were analysed for their use in the seals: a ferrofluid and magnetorheological fluid. The sealing capacity of the MRF based seals was higher than 45kPa per ring, but the friction of the seal in the bearing was 8 N•m, too large for the use in precision spindles of machine tools. The ferrofluid seal achieved sealing capacity around 9kPa per ring, good enough to be used in the spindles of machine tools, with a friction 0.25 N•m. The feasibility of using ferrofluids for developing high performance seals for high precision spindles and the validity of the simulation models has been demonstrated experimentally.

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Numerical algorithm for analyzing the magnetic fluid seals

Cited by 19 publications

References 4 publications

Theory analyses and applications of magnetic fluids in sealing

Theory analyses and applications of magnetic fluids in sealing

A study of the torque characteristics of small disk brake using magnetic fluid

Seals Based on Magnetic Fluids for High Precision Spindles of Machine Tools

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