Leakage-free Rotating Seal Systems with Magnetic Nanofluids and Magnetic Composite Fluids Designed for Various Applications

Borbáth, Tünde; Bica, D.; Potencz, I.; Borbáth, Istvan; Boros, Tibor; Vékás, L.

doi:10.5293/ijfms.2011.4.1.067

Cited by 24 publications

(8 citation statements)

References 7 publications

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“…The design of a magnetic sealing is based on an axial sealing gap in which the corresponding magnetic fluid is exposed to the field of a PM. Further design and material constrains are explained in detail in Borbath et al (2011). Nevertheless, the combination of FFs for sealing and MRFs for torque transmission in the same shear gap seems not to be applicable.…”

Section: Introductionmentioning

confidence: 99%

Smart sealing for magnetorheological fluid actuators

Hegger

Maas

2018

Journal of Intelligent Material Systems and Structures

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In automotive and industrial environments, magnetorheological fluid–based applications such as clutches and brakes are gaining continuously more attention. However, one of the serious challenges for their application are drag losses at high shear rates. While viscous losses of the magnetorheological fluid can be eliminated by a magnetorheological fluid movement control based on partially filled shear gaps, commonly utilized sealings also cause drag losses based on dry friction. To overcome these challenges, in this contribution, a novel design of sealings for magnetorheological fluid–based actuators is introduced eliminating the adverse drag losses. The intended sealing is based on the magnetorheological fluid itself, positioned in a sealing gap and exposed to a well-defined magnetic stray field of a permanent magnet to prevent any leakage. To eliminate drag torques, a superimposed functional principle with the magnetorheological fluid movement control is utilized. An analytical and a simulation-based modeling approach is proposed describing the torque behavior of the magnetorheological fluid sealing. In experimental investigations, the drag torque-free operation is proven by showing a lossless operation above a defined rotational speed.

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Section: Introductionmentioning

confidence: 99%

Smart sealing for magnetorheological fluid actuators

Hegger

Maas

2018

Journal of Intelligent Material Systems and Structures

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“…However, it was until 1995 that Chol tried to use nanofluids as working agents in heat transfer. [2] Since then, nanofluids have attracted wide attention from industrial cooling [3], nuclear power generation [4], automotive [5,6], fuel cell [7], drug delivery [8], cancer therapy [9], detergency [10], dynamic sealing [11] etc. Especially, some nanofluids with specific particles such as magnetic nanofluids, mainly known as ferrofluid, contain strong and unique properties, which may have wider usage in industry for being sensitive to external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement of dynamic concentration of nanofluid in laminar flow

Hong

Liu

Yan

et al. 2017

Experimental Thermal and Fluid Science

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Nanofluid is thought to have a potential enhancement in heat transfer behaviour of fluid. The nanoparticle concentration in nanofluid is one of the most important factors that affect the nanofluid behaviour. The static concentration was applied in the researches under flowing condition. In this paper, Nuclear Magnetic Resonance (NMR) scanning was applied to study the dynamic concentration of nanofluid flow in pipe. The experiments were carried out with ferrofluid under different concentration and temperature. A new parameter T2 * was introduced in the study. Experiments were carried out to obtain the T2 * of nanofluid in the pipe. An empirical equation based on T2 * and temperature was proposed to calculate the concentration of nanoparticles. Then, experiments were carried out with flowing ferrofluid in pipe. The dynamic concentration was calculated with the empirical equation. It has a highest concentration near the pipe wall. The concentration decreases from the wall to the pipe centre.Furthermore, the experiment result also gives out a chance to investigate the mechanism of nanoparticle movement in laminar flow with the concentration gradient along radius.

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“…As it is known, there is a strong connection between the microstructural properties of the magnetic fluids and their macroscopic behavior, which qualifies them to be used in various technical applications [11], magnetofluidic devices such as rotating seals [12,13], bearings [14], sensors, and transducers [15,16], or even in thermal applications [17]. A proper design of a magnetofluidic device implies detailed data on various properties of magnetic fluids, including the static magnetic ones, studied by applying the demagnetizing field correction.…”

Section: Introductionmentioning

confidence: 99%

Study of Static Magnetic Properties of Transformer Oil Based Magnetic Fluids for Various Technical Applications Using Demagnetizing Field Correction

Marinică

2017

Journal of Nanomaterials

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Static magnetization data of eight transformer oil based magnetic fluid samples, with saturation magnetization ranging in a large interval from 9 kA/m to 90 kA/m, have been subjected to the demagnetizing field correction. Using the tabulated demagnetization factors and the differential magnetic susceptibility of the samples, the values of the radial magnetometric demagnetization factor were obtained in the particular case of VSM880 magnetometer. It was found that the demagnetizing field correction keeps the saturation magnetization values unchanged, but instead the initial magnetic susceptibility of the magnetic fluid samples varies widely. The mean magnetic diameter, obtained through magnetogranulometry from the measured data, is higher than that obtained from the corrected ones and the variation rate increases with the magnetic particle volume fraction growth.

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Leakage-free Rotating Seal Systems with Magnetic Nanofluids and Magnetic Composite Fluids Designed for Various Applications

Cited by 24 publications

References 7 publications

Smart sealing for magnetorheological fluid actuators

Smart sealing for magnetorheological fluid actuators

Experimental measurement of dynamic concentration of nanofluid in laminar flow

Study of Static Magnetic Properties of Transformer Oil Based Magnetic Fluids for Various Technical Applications Using Demagnetizing Field Correction

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