Tightness testing of rotary ferromagnetic fluid seal working in water environment

Szczęch, Marcin; Horak, Wojciech

doi:10.1108/ilt-02-2015-0014

Cited by 30 publications

(10 citation statements)

References 11 publications

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“…Van der Wal et al reported that when the sealing and magnetic liquid interfaces are unstable, the liquids emulsify, leading to seal failure [7]. Szczech and Horak noted that different speeds of two liquids cause Kelvin-Helmholtz (KH) instability at the two-phase interface, which also caused seal failure [9]. Qian proposed an approximate treatment method for liquid interface stability analysis and reported that interface instability is the main cause of seal failure [10].…”

Section: Introductionmentioning

confidence: 99%

Turbulence Intensity Characteristics of a Magnetoliquid Seal Interface in a Liquid Environment

Wang

et al. 2021

Coatings

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In a liquid environment, the turbulence intensity of the interfacial layer between the magnetic and sealing medium fluids in magnetic liquid seals directly affects the layer stability. Reducing the maximum turbulence intensity of the fluid interface layer effectively improves the stability of the magnetic fluid rotary seal. In this study, we simulated magnetic fluid sealing devices with different structures in liquid environments using the FLUENT software. The simulation results were verified through experimental analyses of the turbulence intensity at the sealing interface. The maximum turbulence intensity of the liquid interface layer increased with increasing shaft speed. At the same speed, the turbulence intensity was maximized at the shaft interface before gradually decreasing in a multistage linear pattern along the radial direction. A magnetic liquid seal with an optimized structure (OS) in the liquid environment was designed based on these results. The maximum turbulence intensity of the liquid interface layer in the OS was independent of the rotation speed and was more than 20% lower than that that in the traditional structure. These results provide a reference for designing magnetic liquid sealing devices.

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Section: Introductionmentioning

confidence: 99%

Turbulence Intensity Characteristics of a Magnetoliquid Seal Interface in a Liquid Environment

Wang

et al. 2021

Coatings

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“…reported that when sealing and magnetic liquid interfaces are unstable, the liquids emulsify, leading to seal failure [7] . Szczech and Horak noted that speed differences between the two liquids caused Kelvin-CHINESE JOURNAL OF MECHANICAL ENGINEERING •4• Helmholtz (KH) instability at the two-phase interface, which also led to seal failure [9] . Qian proposed an approximate treatment method for liquid interface stability analysis and reported that interface instability is the main cause of seal failure [10] .…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulence intensity of fluid medium interface layer on magnetic liquid seal in liquid environment

Cheng

et al. 2021

Preprint

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In a liquid environment, the instability of the interface layer of the rotating fluid medium is one of the main causes for the failure of magnetic liquid seals. The turbulence intensity of the interfacial layer between the magnetic and the sealing medium fluids in magnetic liquid seals directly affects the layer stability. Reducing the maximum turbulence intensity is an effective way to improve the stability of the magnetic fluid rotating seal. In this study, we simulated magnetic fluid sealing devices with different structures in liquid environments using FLUENT software. The simulation results are verified through experimental analyses and the turbulence intensity at the sealing interface is analyzed. We simulated the magnetic circuit using Maxwell software, and compared the difference between the optimized and traditional structures. The results show that the maximum turbulence intensity of the liquid interface layer increases with the increasing shaft speed. At the same speed, the turbulence intensity is maximized at the shaft interface before gradually decreasing in a multistage linear pattern along the radial direction. The turbulence intensity at the interface of the spindle is relatively large, which seriously affects the stability of the interface. Based on these results, the optimized structure (OS) of the magnetic liquid seal in the liquid environment is designed. The maximum turbulence intensity of the liquid interface layer in the OS is more than 20% lower than that in the traditional structure (TS), and it is independent of the rotation speed. The optimized and the traditional structures have the same magnetic induction intensity distribution at the sealing clearance. The maximum magnetic induction intensity of the OS is 6.25% higher than that of the traditional one. These results provide a reference for designing magnetic liquid sealing devices.

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“…In contrast to ordinary sealing, magnetofluid sealing has many strength points such as no wear, no leakage, no contamination, and lasting service life [2]. erefore, magnetofluid seals are widely used in dynamic seals, isolation seal, and environmental seal [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Circuit Design and Magnetic Field Finite Element Analysis of Converging Stepped Magnetofluid Seal with Small Clearance

Yang

Zhang

2020

Advances in Materials Science and Engineering

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The stepped magnetofluid seal is an effective method for improving the pressure ability of ordinary magnetofluid seals (OMS) with large clearance. At present, the research on stepped magnetofluid seal with less than 0.4 mm small clearance has not been carried out yet. The equivalent magnetic circuit design of converging stepped magnetofluid seal (CSMS) with small clearance has been carried out and verified by magnetic field finite element method based on the CSMS theory and magnetic circuit theory. The effects of the width of the axial seal position, the height of the radial seal position, the number of the pole tooth in the axial seal position, and the number of the pole tooth in the radial seal position on the theoretical pressure ability of the CSMS are investigated by numerical simulation. The calculation results are analyzed and discussed. The results show that the magnetic flux leakage at the junction of the permanent magnet and pole piece causes the higher pressure ability of the CSMS structure designed by the equivalent magnetic circuit method than that calculated by the magnetic field finite element method. When the width of the axial seal position is greater than the height of the radial seal position and the number of pole teeth in the axial seal position is less than the number of pole teeth in the radial seal position, the CSMS has the best effect. Compared with OMS with small clearance, CSMS has greater advantages.

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Tightness testing of rotary ferromagnetic fluid seal working in water environment

Cited by 30 publications

References 11 publications

Turbulence Intensity Characteristics of a Magnetoliquid Seal Interface in a Liquid Environment

Turbulence Intensity Characteristics of a Magnetoliquid Seal Interface in a Liquid Environment

Effect of turbulence intensity of fluid medium interface layer on magnetic liquid seal in liquid environment

Magnetic Circuit Design and Magnetic Field Finite Element Analysis of Converging Stepped Magnetofluid Seal with Small Clearance

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