New Designs of Centrifugal Magnetic Fluid Seals for Rotating Shafts in Marine Technology

Matuszewski, Leszek

doi:10.2478/pomr-2019-0023

Cited by 13 publications

(8 citation statements)

References 42 publications

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“…Thus, the high interdisciplinary characteristics of magnetic fluids have brought experimental physicists, chemists, theoretical physicists, and applied mathematicians together. The magnetic fluids do constitute a rich source of application in hard disk scaling, 4 revolving X‐ray tubes for engineering applications, 5 revolving shafts sealing, 6 repair of retinal detachment in eye surgery, heat controlling in loudspeakers, 7 contrast agent in magnetic resonance imaging, 8 magnetic drug targeting, 9,10 and so forth.…”

Section: Introductionmentioning

confidence: 99%

Spectral simulation to investigate the effects of nanoparticle diameter and nanolayer on the ferrofluid flow over a slippery rotating disk in the presence of low oscillating magnetic field

Acharya

2021

Heat Trans

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This article explores the impacts of the solid–liquid interfacial layer and nanoparticle diameter on the unsteady ferrous‐water nanoliquid flow over a spinning disk. The existence of velocity slip is presumed on the disk. Additionally, the low oscillating magnetic field effect is included to extract the hydrothermal consequences of the problem. Shliomis theory has been presented to verbalize the foremost equations of the mentioned flow problem. The similarity transformation renders the dimensionless equations. Spectral quasilinearization technique along with the residual error profile is presented to resolve the converted equations. An adequate number of pictures and tables are portrayed to improve the parametric study of the problem. Several streamlines, isotherms, contour plots, and three‐dimensional figures are presented to disclose the hydrothermal integrity of the nanofluidic transport. Effective magnetization parameter produces 4.67% skin frictional increment. Heat transport declines for nanoparticle diameter but is enhanced for nanolayer conductivity ratio. The presence of an oscillating magnetic field always promotes heat transference as compared with the absence of the oscillating field. The nanolayer conductivity ratio conveys the highest 8.69% heat transport rate, whereas the magnetization factor provides the lowest, 1.79%. It has novel applications in magnetic drug targeting, hard disk scaling, magnetic resonance imaging, spin coating, lubrication, and so forth.

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Section: Introductionmentioning

confidence: 99%

Spectral simulation to investigate the effects of nanoparticle diameter and nanolayer on the ferrofluid flow over a slippery rotating disk in the presence of low oscillating magnetic field

Acharya

2021

Heat Trans

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“…In the pre-sliding stage, it can be assumed that θ ≈ 0, θ ≈ 0, z ≈ 0. So, according to (11), it can be concluded that…”

Section: Dynamic Parameter Identification Of Lugre Modelmentioning

confidence: 99%

“…In the past, many methods including filling felt oil rings or extruding U-shaped sealing rings in labyrinth structures were used [8], [9], [10], but both these examples cannot achieve a complete state of airtightness and water tightness. Moreover, they bring great friction interference torque to the servo control system, seriously affecting the low-speed stability and speed control accuracy of the detection system [11], which further affects the tracking accuracy of the target, and reduces the damage effect of the system's jammer or laser on the target.…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Seal Friction Torque Compensation for a Low-Slow-Small UAV Tracking System

Zhuqiu

2023

IEEE Access

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To ensure reliable and accurate operation in a complex field environment for Low-Slow-Small unmanned aerial vehicle (LSS-UAV) tracking systems, a dynamic seal shafting structure consisting of a labyrinthine structure and a magnetic fluid seal ring is designed to protect important equipment, such as the infrared sensor, visible CCD and the laser rangefinder from erosion and oxidation by the external environment. A friction torque model is established for the system's dynamic seal structure to ensure tracking accuracy of the system. The simulation results show that the closed-loop speed accuracy of the system is improved by nearly 10 fold after adding friction torque compensation. The actual test results show that including friction torque compensation can effectively reduce the start-up delay and speed fluctuation error, and the speed fluctuation error is reduced by more than 80% compared to that without friction torque compensation. The tracking accuracy of the dynamic LSS-UAV is reduced from 56.44 µrad to 14.86 µrad after adding friction torque compensation, which meets the requirement of smooth and accurate tracking for LSS-UAV tracking systems, and verifies the effectiveness and accuracy of compensation for the dynamic seal friction torque.

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“…Fan et al (2021) designed an FF seal for an aerospace air cylinder and solved the problem of leakage and service life. However, the performance of FF seals is restricted by their limited pressure capability per stage and intolerance of high temperature (Matuszewski, 2019). MRFs are composed of soft ferromagnetic or paramagnetic particles (about 1-10 μm) dispersed in a carrier fluid.…”

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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New Designs of Centrifugal Magnetic Fluid Seals for Rotating Shafts in Marine Technology

Cited by 13 publications

References 42 publications

Spectral simulation to investigate the effects of nanoparticle diameter and nanolayer on the ferrofluid flow over a slippery rotating disk in the presence of low oscillating magnetic field

Spectral simulation to investigate the effects of nanoparticle diameter and nanolayer on the ferrofluid flow over a slippery rotating disk in the presence of low oscillating magnetic field

Research on Dynamic Seal Friction Torque Compensation for a Low-Slow-Small UAV Tracking System

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

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