Research on dynamic coupling characteristics of magnetic fluid and gas medium interface in sealing devices

doi:10.1063/5.0149545

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…The results indicate that the PR of the structure remains constant at a linear speed of 10 m s −1 . Zhenggui Li [24], numerically simulated the interface of a FS and changes in the interfacial shape and width were tested and verified using a FS device. The results showed that the PR decreased with an increase in seal clearance, and the FS interface generated a small leakage channel.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on pole teeth interlaced divergent ferrofluid seals with single magnetic source

Li,

Huang,

Lei

et al. 2024

Phys. Scr.

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For the improvement of pressure resistance in ferrofluid seal with a small gap, a structure of divergent ferrofluid seal (FS) with alternating pole teeth (PT) was proposed in this paper. Distribution of the magnetic field in the seal gap (SG) is analyzed by using the magnetic field finite element method, and the theoretical pressure resistance (PR) is calculated by using the step ferrofluid seal PR theory. Effect of the number of pole teeth and seal gap on its sealing PR were studied experimentally. The PR of the interlaced divergent FS is compared to the experimental findings of a conventional ferrofluid seal structure. The results show that the actual pressure value of the interlaced divergent FS is consistent with its theoretical pressure value well. Compared to the common ferrofluid seal, the interlaced divergent FS has better PR.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on pole teeth interlaced divergent ferrofluid seals with single magnetic source

Li,

Huang,

Lei

et al. 2024

Phys. Scr.

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Failure mechanism and pressure resistance investigation of divergent magnetic fluid seals with staggered pole teeth

et al. 2023

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This paper investigates the failure mechanism of a divergent magnetic fluid seal (MFS) with staggered pole teeth (SPT). By pole teeth, we mean the teeth machined on the inner ring surface of the pole pieces, which have a magnetic field gathering effect. A sealing apparatus capable of directly visualizing the surface deformation of the magnetic fluid film is developed, and the sealing mechanism is studied through experiments. The magnetic field distribution of the sealing apparatus is numerically analyzed to calculate its theoretical value, and this is compared against the experimental observations. The impacts of the eccentricity distance of the axial pole teeth and the addition of magnetic insulation materials on the pressure resistance of the MFS–SPT structure are investigated. The results show that, during the pressure loading process, the magnetic fluid moves to the low-pressure side. When the seal fails, micro-leakage and complete leakage occur successively in the MFS–SPT structure. There is good agreement between the experimental and theoretical pressure resistance of a divergent MFS–SPT. As the eccentricity distance of the axial pole teeth increases, the pressure resistance of the divergent MFS–SPT is enhanced. The sealing performance of the divergent MFS–SPT structure is improved when a magnetic insulation material is added to the grooves of the axial teeth.

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Effects of micron–nano composite iron particle powders on the tribological properties of magnetic fluids used for a nonlinear energy sink vibration absorber

Nie,

Gong,

et al. 2023

Physics of Fluids

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Low-frequency vibration control is a crucial challenge within the realm of fluid physics, and in this paper, a novel magnetic compound fluid (MCF) has been developed to produce a magnetic fluid nonlinear energy sink (MF-NES) with optimum energy consumption efficiency. The mixed doping of bi-dispersed nano-sized iron particles (NIPs) and micrometer-sized carbonyl iron particles (CIPs) can generate a load-bearing structure between the inertial mass and the MF-NES shell with a reduced friction coefficient. The effectiveness and sensitivity of the MF-NES mechanism is significantly enhanced, particularly in responding to low frequency vibrations. To predict and quantify the friction coefficient of the MF, a novel hybrid approach combining data handling and a genetic algorithm model was developed and rigorously validated through empirical data obtained from the experiments and demonstrated that the bi-dispersed NIPs/CIPs MCF had a notably lower friction coefficient, making it adept at responding to low-frequency and even ultra-low-frequency vibrations.

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Research on dynamic coupling characteristics of magnetic fluid and gas medium interface in sealing devices

Cited by 6 publications

References 31 publications

Numerical and experimental study on pole teeth interlaced divergent ferrofluid seals with single magnetic source

Numerical and experimental study on pole teeth interlaced divergent ferrofluid seals with single magnetic source

Failure mechanism and pressure resistance investigation of divergent magnetic fluid seals with staggered pole teeth

Effects of micron–nano composite iron particle powders on the tribological properties of magnetic fluids used for a nonlinear energy sink vibration absorber

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