A magnetorheological fluid shaft seal with low friction torque

Kubík, Michal; Pavlíček, D; Macháček, Ondřej; Strecker, Zbyněk; Roupec, Jakub

doi:10.1088/1361-665x/ab0834

Cited by 48 publications

(16 citation statements)

References 24 publications

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“…A novel radial MR valve was described by Hu et al 177 In their design the magnetic flux was guided into the annular gap maximizing the effective area and providing larger pressure drops and response times if compared to classical radial MR valves. Also recently, Kubik et al 178 constructed a MRF shaft seal with very low friction torque under a pinch mode of operation. A lower friction torque than standard MRFs and a higher burst pressure than any ferrofluid were obtained.…”

Section: Review Soft Mattermentioning

confidence: 99%

Magnetorheology: a review

2020

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Section: Review Soft Mattermentioning

confidence: 99%

Magnetorheology: a review

2020

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“…The gap of the MRF seal usually ranges from 0.1 to 0.3 mm (Kubík et al , 2019). As the MRF in the gap is covered by both the rotating and stationary ring (Cheng et al , 2019), it is extremely difficult to measure the temperature of the MRF in the gap directly by means of experiments on this environment.…”

Section: End Face Sealsmentioning

confidence: 99%

Temperature rise of magnetorheological fluid sealing film in a spiral grooved mechanical

Zhang

Zhou

Meng

2022

ILT

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Purpose In the magnetorheological fluid (MRF) sealing, a large amount of friction heat is generated in the fluid film with micron thickness due to the viscosity dissipation, which leads to seal failure and MRF deterioration. The purpose of this study is to investigate the mechanism of temperature rise of MRF film under the action of the three-field coupling of the flow field, temperature field and magnetic field. Design/methodology/approach The fluid film was simplified as a Couette flow in this work to simulate the temperature change in the sealing fluid film under different working conditions. The corresponding experiment for test the temperature rise was also carried out, and the temperature of the characteristic point of the stationary ring was measured to validate the model. Findings The results show that the temperature rise is mainly affected by the rotational speed, magnetic field strength and fluid film thickness. The magnetic field enhances the convective heat transfer in the MRF film. The thinner the fluid film, the more frictional heat generated. The MRF film reaches its maximum temperature at the contact with the end face of rotating ring due to frictional heat. Originality/value A method for temperature rise analysis of MRF fluid sealing films based on Couette flow is established. It is helpful for the study of liquid film frictional heat in MRF seals.

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“…The volumetric loss of gear pumps was reduced without greater friction or higher manufacturing precision. But the stability and the friction torque of MRF seals have always been a concern in applications (Kubík et al, 2019). MPs have been recently adopted in magnetic seals.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of magnetic seals by ferrofluids, magnetorheological fluids and magnetic powders

2022

Front. Mater.

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Magnetic seals as a class of non-contact sealing technology have been a research focus. In these seals, magnetic materials, usually ferrofluids or magnetorheological fluids are attracted in sealing gaps as sealing medium. Recently, a novel sealing method using nano-micron sized magnetic powders has been raised up as well. However, the working performance of these magnetic seals has not been studied thoroughly and comparatively yet. Here, we provide a comparative study of magnetic seals by ferrofluid, magnetorheological fluid and magnetic powder theoretically and experimentally. The formulas of pressure capability are derived based on their different properties. A modified empirical formula of magnetic powder seals is proposed, taking the frictional effect into consideration. The magnetic field distribution is calculated by the finite element method. Finally, a test bench for static magnetic seals is established. The pressure capability and leakage rate of three materials are measured by sealing experiments. The differences in mechanism of pressure transfer and the ability of self-recovery are discussed. This research summarizes the characteristics of different magnetic seals, and provides a guidance for sealing medium selection and structure design.

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A magnetorheological fluid shaft seal with low friction torque

Cited by 48 publications

References 24 publications

Magnetorheology: a review

Magnetorheology: a review

Temperature rise of magnetorheological fluid sealing film in a spiral grooved mechanical

A comparative study of magnetic seals by ferrofluids, magnetorheological fluids and magnetic powders

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