Ferrofluid rotary seal with replenishment system for sealing liquids

Wal, Karoen van der; Ostayen, Ron A.J. van; Lampaert, S.G.E.

doi:10.1016/j.triboint.2020.106372

Cited by 39 publications

(15 citation statements)

References 24 publications

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“…Magnetic liquid seals offer several advantages over traditional mechanical seals, including zero leakage [1,2], easy maintenance [3], no pollution, and high reliability [4,5], thereby attracting the attention of many researchers. Although the sealing of magnetic liquids against gases has significantly advanced [6], there are still several unsolved problems related to sealing liquids [7]. He et al proposed problems of incompatibility between the magnetic and sealed liquids, and issues of liquid-liquid stability when magnetic liquid is used to seal liquids [8].…”

Section: Introductionmentioning

confidence: 99%

“…He et al proposed problems of incompatibility between the magnetic and sealed liquids, and issues of liquid-liquid stability when magnetic liquid is used to seal liquids [8]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…5] ; all of these have attracted the attention of many researchers. The sealing of magnetic liquids against gases has advanced significantly [6] , but many problems related to sealing liquids remain worth studying [7] . Kamiyama proposed problems of incompatibility between the magnetic and sealed liquids, as well as issues of liquid-liquid stability when the magnetic liquid is used to seal liquids [8] .…”

Section: Introductionmentioning

confidence: 99%

“…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] .…”

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 recent years, magnetic nanoliquids (known as ferrofluids) have received striking attention from fluid dynamic research community owing to their widespread applications in the miscellaneous discipline that involves the field of medicine (biomaterial components for wound treatment, ammonia detection, and drug delivery targeting, especially in tumor and cancer treatment), electrical and electronic equipments (high-power electric switches, personal computer hard circles, heat controlling operators in the electric engine, Hi-Fi speakers, rotating seals, display devices, recording devices), dampers in automobiles, cleansing, and recovering oil, optical actuators of high sensitivity, magneto-resistive devices, and so on. [9][10][11][12][13][14][15][16] The colloidal composition of ferrofluids has been accomplished by scattering superparamagnetic nanocomposites (magnetite, cobalt ferrite, manganese-zinc ferrite, nickel-zinc ferrite) within nonmagnetic customary heat exchange fluids (water, oil, sodium alginate, ethylene glycol), which at the end exposes fluid features with magnetic properties. [17][18][19] In these functional fluids (ferrofluids), the magnetic field plays a tremendous role in controlling the flow and augmenting heat transport features.…”

Section: Introductionmentioning

confidence: 99%

Radiative CNT‐based hybrid magneto‐nanoliquid flow over an extending curved surface with slippage and convective heating

Ali¹,

Jana

Das

2020

Heat Trans

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This study concentrates on the hydrothermal prominence of a mixed convective flow of a hybrid nanoliquid over a convectively heated extending curved surface under the influence of a uniform transverse magnetic field. Two types of carbon nanotubes (CNTs), namely single‐walled carbon nanotubes (SWCNTs) and multi‐walled carbon nanotubes (MWCNTs), and magnetite nanoparticles are dispersed in the host liquid (water) to simulate the hybrid nanoliquid flow model. First‐ and second‐order velocity slip conditions and nonlinear radiative heat flux are incorporated in this model. First, the system of governing partial differential equations is changed into nonlinear ordinary differential equations through the utilization of appropriate transformations and computed numerically via MATLAB built‐in function bvp4c based on the three‐stage Lobatto IIIA technique. The consequences of physical and geometrical parameters pertinent to this analysis on the dimensionless physical quantities of interest are deliberated using requisite graphs and tables. Our simulation communicates that the first‐order velocity slip parameter decreases the velocity profile, whereas the second‐order velocity slip parameter is found to be augmented. The suspension of CNTs in the magnetite nanoliquid improves the local surface drag force but diminishes the local heat flux. Moreover, it is examined that SWCNTs have greater impacts than MWCNTs.

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Ferrofluid rotary seal with replenishment system for sealing liquids

Cited by 39 publications

References 24 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

Radiative CNT‐based hybrid magneto‐nanoliquid flow over an extending curved surface with slippage and convective heating

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