Hydrodynamic bearing lubricated with magnetic fluids

Urreta, Harkaitz; Leicht, Zoltan; Sanchez, Aitor; Agirre, Amaia; Kuzhir, Pavel; Magnac, G.

doi:10.1088/1742-6596/149/1/012113

Cited by 41 publications

(46 citation statements)

References 1 publication

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“…1f]. So, beyond the third critical stress, 3 , the chain length is no more fixed but decreases progressively with increasing stress (or strain). We find that, at the same shear rate, the hydrodynamic force required to detach a chain from the wall is about four times the force required to destroy a free chain.…”

Section: Theorymentioning

confidence: 99%

“…So, the magnetic and mechanical properties of these fluids can be efficiently controlled by external magnetic fields and this makes them attractive for several industrial applications. Controlled stiffness dampers and magnetorheological finishing of optical surfaces have been successfully commercialized during the last decade and the other magnetorheological smart devices, such as controlled hydrodynamic bearings, are being developed [3]. The improvement of the real time control of these devices and the increase of the controllability range of their control parameters (flow rate, stiffness) are still important issues.…”

Section: Introductionmentioning

confidence: 99%

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Non-linear viscoelastic response of magnetic fiber suspensions in oscillatory shear

Kuzhir

Gómez‐Ramírez

López–López

et al. 2011

Journal of Non-Newtonian Fluid Mechanics

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International audienceThis paper reports the first study on the large amplitude oscillatory shear flow for magnetic fiber suspensions subject to a magnetic field perpendicular to the flow. The suspensions used in our experiments consisted of cobalt microfibers of the average length of 37 µm and diameter of 4.9 µm, dispersed in a silicon oil. Rheological measurements have been carried out at imposed stress using a controlled stress magnetorheometer. The stress dependence of the shear moduli presented a staircase-like decrease with, at least, two viscoelastic quasi-plateaus corresponding to the onset of microscopic- and macroscopic scale rearrangement of the suspension structure, respectively. The frequency behavior of the shear moduli followed a power-law trend at low frequencies and the storage modulus showed a high-frequency plateau, typical for Maxwell behavior. Our simple single relaxation time model fitted reasonably well the rheological data. To explain a relatively high viscous response of the fiber suspension, we supposed a coexistence of percolating and pivoting aggregates. Our simulations revealed that the former became unstable beyond some critical stress and broke in their middle part. At high stresses, the free aggregates were progressively destroyed by shear forces that contributed to a drastic decrease of the moduli. We have also measured and predicted the output strain waveforms and stress-strain hysteresis loops. With the growing stress, the shape of the stress-strain loops changed progressively from near-ellipsoidal one to the rounded-end rectangular one due to a progressive transition from a linear viscoelastic to a viscoplastic Bingham-like behavior

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-linear viscoelastic response of magnetic fiber suspensions in oscillatory shear

Kuzhir

Gómez‐Ramírez

López–López

et al. 2011

Journal of Non-Newtonian Fluid Mechanics

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“…In Bo¨lter (1999), Guldbakke et al (2009), Guldbakke and Hesselbach (2006) and Abel-Keilhack (2002, 2003), a theoretical background was presented for this bearing concept, but no exact solution for calculating the load capacity of the bearing was provided. Similar work is done in Urreta et al (2009) that demonstrates the difference in using an FF and an MR fluid in a journal bearing. It showed that the internal pressure generated in an FF subjected to a magnetic field is not strong enough to be relevant for use as an active lubricant in most journal bearing applications.…”

Section: Introductionmentioning

confidence: 66%

Load and stiffness of a hydrostatic bearing lubricated with a Bingham plastic fluid

Lampaert

Ostayen

2019

Journal of Intelligent Material Systems and Structures

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Using a smart fluid, for example, magnetorheological or electrorheological, in a hydrostatic bearing gives the possibility to actively change the bearing properties during operation. This work presents an analytical model to predict the load and stiffness of a planar hydrostatic bearing lubricated with a Bingham plastic fluid. The model is validated with the use of a numerical model that uses the Bingham–Papanastasiou regularization to achieve convergence. The model gives insight into the size of the operational range of the bearing and the load characteristic.

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“…97 The main advantages of these bearings over conventional bearings were introduced, such as extremely low nonrepetitive run-out, good damping and quietness of operation, maintenance free service and high reliability. 90 Urreta et al 98 set up a test bench for plain journal bearings lubricated with FFs and magnetorheological fluids (MR). Theoretical analysis was carried out with numerical solutions of Reynolds equation, based on apparent viscosity modulation for FFs and Bingham model for MR.…”

Section: Bearing Lubrication Testsmentioning

confidence: 99%

Ferrofluids lubrication: a status report

Huang

Wang

2015

Lubrication Science

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Ferrofluids (FFs) are stable colloidal suspensions composed of single‐domain magnetic nanoparticles dispersed in a carrier liquid. And it is an intelligent material, exhibiting normal liquid behaviour coupled with superparamagnetic properties. Since the properties and the location of these fluids can easily be influenced by a magnetic field, FFs have recently attracted many scientific, industrial and commercial applications. Lubrication is one of the most important applications for FFs, and the advantage of FFs as lubricant, over the conventional ones, is that the former can be retained at the desired location with moderate magnetic fields. The main focus of this paper is to present a comprehensive review on FFs lubrication theories based on the three flow models of Neuringer–Rosensweig, Shliomis and Jenkins. Besides, a few experimental studies on FFs lubrication are discussed briefly. Copyright © 2015 John Wiley & Sons, Ltd.

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Hydrodynamic bearing lubricated with magnetic fluids

Cited by 41 publications

References 1 publication

Non-linear viscoelastic response of magnetic fiber suspensions in oscillatory shear

Non-linear viscoelastic response of magnetic fiber suspensions in oscillatory shear

Load and stiffness of a hydrostatic bearing lubricated with a Bingham plastic fluid

Ferrofluids lubrication: a status report

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