In-plane friction behaviour of a ferrofluid bearing

Lampaert, S.G.E.; Fellinger, B.J.; Spronck, Jo W.; Ostayen, Ron A.J. van

doi:10.1016/j.precisioneng.2018.05.013

Cited by 17 publications

(13 citation statements)

References 12 publications

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“…Moreover, the low convergence ratio further improves the performance. In general, use of FF lubricant leads to various added advantages of inclined slider-bearing performances such as long life, silent operation, high precision, reduction of wear, self-sealing ability to various mechanical, electromechanical, and others devices (refer [4,15,16]).…”

Section: Discussionmentioning

confidence: 99%

Ferro‐elastohydrodynamic lubrication of inclined slider‐bearing

Shah

2022

Z Angew Math Mech

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In practice, due to bearing load there is a generation of pressure in the lubricant film, which leads elastic deformation on the bounding surfaces and causes variation in the film thickness. As film thickness plays an important role in performance of the slider-bearing designs; an attempt has been made to study numerical simulation of elastic deformation effect in one-dimensional inclined slider-bearing with ferrofluid (FF) lubricant. The modified Reynolds equation is derived using ferrohydrodynamic theory by Shliomis with transverse uniformly strong magnetic field, and continuity equation. Using this equation dimensionless load-carrying capacity ( W) is studied for different parameters. The results show the better performance of W for lower convergence ratio and higher effective viscosity. However, elastic deformation has no effect on W. Some comparisons are also made with the previous literature.

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Section: Discussionmentioning

confidence: 99%

Ferro‐elastohydrodynamic lubrication of inclined slider‐bearing

Shah

2022

Z Angew Math Mech

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“…Ferrofluids (FFs) 1 are stable colloidal magnetic suspension of single domain ferromagnetic nanoparticles suspended in an appropriate carrier liquid, where particles are coated with surfactant to prevent its agglomeration. Mainly, three different types of FF models are discussed by different authors 2–6 : Neuringer–Rosensweig (NR), Shliomis and Jenkins. NR 1 proposed system of FF equations, where main feature is the consideration of the magnetic body force

(M • ∇) H

when an external magnetic field H is applied.…”

Section: Introductionmentioning

confidence: 99%

“…The results also show that Jenkins viscosity parameter decreases load capacity and increases friction factor at high eccentricity ratios. Lampaert et al 4 studied in‐plane friction behaviour of a FF bearing and shown that bearings can be demonstrated as precision positioning systems. They have provided a basic model to predict the friction behaviour of a bearing design.…”

Section: Introductionmentioning

confidence: 99%

Lubrication impact of ferrofluid on cylinder‐plate system: A comparative study using two flow models

Shah

2023

Lubrication Science

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Squeeze-film characteristics between a long cylinder and an infinite flat plate system are analysed. Ferrofluid (FF) lubricant controlled by transverse uniformly strong magnetic field is used for reducing wear and prolonging life of the system. The modified combined Reynolds equation is derived using two different FF flow models (Shliomis and Jenkins), and continuity equation. The expression for dimensionless film-pressure, load-carrying capacity and squeeze time are derived and calculated numerically for different control parameters.The results show significant improvement in the performance of the system when smaller value of minimum film thickness is chosen. Moreover, the phenomenon can be simulated by both the models equally with proper choice of the parameters.

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“…While the field of hydrodynamic lubrication has been studied extensively over the years, with or without magnetic force involvement, the nonlinear nature of the physics governing such systems caused prior efforts to avoid explicit dynamic solutions of the lubrication-layer thickness evolution over time. Therefore, these efforts usually set the lubrication layer as constant ( 60 , 61 ), or consider time not as an independent variable, but, rather, as an input parameter, setting eccentricity and rate of change as constant ( 62 , 63 ), resulting in a static problem governed by an elliptical equation. Others use planar configurations ( 61 , 64 ), focus on experimental and numerical examination ( 61 , 64 , 65 ), or a combination of the above.…”

Section: Introductionmentioning

confidence: 99%

Magnetohydrodynamic levitation for high-performance flexible pumps

Matia

Shepherd

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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We use magnetohydrodynamic levitation as a means to create a soft, elastomeric, solenoid-driven pump (ESP). We present a theoretical framework and fabrication of a pump designed to address the unique challenges of soft robotics, maintaining pumping performance under deformation. Using a permanent magnet as a piston and ferrofluid as a liquid seal, we model and construct a deformable displacement pump. The magnet is driven back and forth along the length of a flexible core tube by a series of solenoids made of thin conductive wire. The magnet piston is kept concentric within the tube by Maxwell stresses within the ferrofluid and magnetohydrodynamic levitation, as viscous lift pressure is created due to its forward velocity. The centering of the magnet reduces shear stresses during pumping and improves efficiency. We provide a predictive model and capture the transient nonlinear dynamics of the magnet during operation, leading to a parametric performance curve characterizing the ESP, enabling goal-driven design. In our experimental validation, we report a shut-off pressure of 2 to 8 kPa and run-out flow rate of 50 to 320 mL⋅min −1 , while subject to deformation of its own length scale, drawing a total of 0.17 W. This performance leads to the highest reported duty point (i.e., pressure and flow rate provided under load) for a pump that operates under deformation of its own length scale. We then integrate the pump into an elastomeric chassis and squeeze it through a tortuous pathway while providing continuous fluid pressure and flow rate; the vehicle then emerges at the other end and propels itself swimming.

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In-plane friction behaviour of a ferrofluid bearing

Cited by 17 publications

References 12 publications

Ferro‐elastohydrodynamic lubrication of inclined slider‐bearing

Ferro‐elastohydrodynamic lubrication of inclined slider‐bearing

Lubrication impact of ferrofluid on cylinder‐plate system: A comparative study using two flow models

Magnetohydrodynamic levitation for high-performance flexible pumps

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