Effect of non-Newtonian magneto-elastohydrodynamic on performance characteristics of slider-bearings

Mouda, Mouhcine; Nabhani, Mohamed; Khlifi, Mohamed El

doi:10.1108/ilt-11-2018-0416

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…The x-axis is oriented in the counter-clockwise circumferential direction, the y -axis is oriented toward the journal and coincides with the centerline which is inclined by an angle φ (attitude angle) to the load direction, and the z -axis is taken normal to both x - and y -axes. The laminar viscous motion of an electrically conducting non-Newtonian couple stress lubricant with an imposed magnetic field is described by the equations (Fathima et al , 2015; Naduvinamani et al , 2017; Rao et al , 2019; Mouda et al , 2019): where…”

Section: Governing Equationsmentioning

confidence: 99%

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Non-Newtonian couple stress lubrication of MHD elastic journal bearings

Kardoudi

Nabhani

Khlifi

2022

ILT

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Purpose This paper aims to present a numerical model to examine the finite magneto-hydrodynamic (MHD) journal bearings performances including both non-Newtonian couple stress and bearing deformation impacts. Design/methodology/approach Based upon the MHD and Stokes theories, a novel expression of modified Reynolds equation including bearing deformation is obtained. The bearing elastic deformation impact is predicted by means of the Winkler model. Using the numerical differentiation approach, the film pressure is iteratively solved. Different bearing characteristics are then numerically calculated. The validity of the proposed model was verified by comparing with some particular cases from literature. Findings From the numerical presented results, it is demonstrated that the conducting couple stress lubricant with an applied radial magnetic field results in an induced electric current density and thus significantly improves the performances of elastic journal bearings. Particularly, the load-carrying capacity is increased, whereas a reduction in friction factor is observed. Originality/value This numerical model is original, which combines both non-Newtonian couple stress and bearing deformation impacts on finite MHD journal bearings performances. It provides useful information in designing MHD journal bearings, given the lack of experimental studies.

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Section: Governing Equationsmentioning

confidence: 99%

“…(Yamasaki and Shioda, 1977;Rosa et al, 1991;Jang and Lee, 2000). MHD bearings significantly rises load-carrying capacity comparing to conventional bearings (Maki et al, 1966;Fathima et al, 2015;Naduvinamani et al, 2017;Rao et al, 2019;Mouda et al, 2019;Hanumagowda et al, 2020).…”

Section: Introductionmentioning

confidence: 97%

Non-Newtonian couple stress lubrication of MHD elastic journal bearings

Kardoudi

Nabhani

Khlifi

2022

ILT

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“…Substituting Eqns (18) and (19) into Eqn (20) gives us (, ) xy θ and it obeys the following differential equation:…”

Section: Formulationmentioning

confidence: 99%

“…Long term stability and faster rate of heat transfer 1,2 of FFs have fascinated the researchers dealing with the problems of various geometries like slider planer motion 3 table, rotating disk [4][5][6] , circular disks 7,8 helical pipes 9 , etc. Ferro fluid lubrication 10 plays an imperative role to enhance the heat transfer rate and the lifting force in thrust bearings [11][12][13] , journal bearings [14][15][16][17] , conical bearings 18 , inclined slider bearings 19,20 , exponential slider bearings 21 , ball bearings 22 and textured rolling bearing 23 .…”

mentioning

confidence: 99%

Hematite Suspension based Absorbent Pad Inclined Slider Influenced by Slip and Squeeze Velocity with Altering Film Ratio

Ram

Kumar

2021

Def. Sc. J.

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The effects of various entities like slip and squeeze velocities, inlet-outlet film ratio, and the material parameter have been fairly explored in a hematite suspension based absorbent (porous) pad inclined slider. Mathematical expressions for pressure, load capacity (lifting force), friction, friction coefficient, and position of centre of pressure (COP) in terms of the above physical parameters have been acquired. Jenkins model has been employed as a mathematical set of governing equations. It has been found that an increase in the squeeze velocity has enhanced the load capacity and diminished the friction coefficient whereas the escalating values of slip velocity and material properties have reversed the trends. Besides, the optimum value of the inlet-outlet film ratio for maximum load capacity has reduced with a rise in the squeeze velocity. Improvement in material parameters shifted the position of COP slightly towards the inlet while an enhancement in the squeeze velocity and film ratio shifted the same slightly towards the outlet. The results acquired in the present paper will be helpful in designing and modifying the various types of fluid dynamic slider bearings.

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“…Many studies found that the use of MHD Newtonian lubricants blended with long-chain additives enhance the characteristics of bearings, such as Naduvinamani and Hosmani (2018) and Mouda et al (2019) using the couple stress fluid theory developed by Stokes (1966). The combined effects of MHD and couple stress are most used in large industrial applications, for example, these types of bearings are of interest in the construction of high-frequency transducers.…”

Section: Introductionmentioning

confidence: 99%

Surface roughness effects on non-Newtonian MHD non-parallel squeeze film bearing

Mouda

Nabhani

Khlifi

2020

ILT

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Purpose The purpose of this paper is to examine the effect of surface roughness on the magneto-hydrodynamic (MHD) non-parallel squeeze film lubrication using non-Newtonian lubricant. Design/methodology/approach Based on the MHD thin film lubrication theory and the Stokes theory and homogenization method, the homogenized MHD Reynolds equation is derived considering the squeezing effect. Findings It is found that the obtained results indicate that the interaction among non-Newtonian, MHD and surface roughness influences is significant. Originality/value This study is original which compares the dimensionless load capacity and dimensionless response time among transverse, longitudinal and, for the first time, anisotropic surface roughness types under magneto-hydrodynamic non-Newtonian non-parallel squeeze film lubrication. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0071/

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Effect of non-Newtonian magneto-elastohydrodynamic on performance characteristics of slider-bearings

Cited by 8 publications

References 23 publications

Non-Newtonian couple stress lubrication of MHD elastic journal bearings

Non-Newtonian couple stress lubrication of MHD elastic journal bearings

Hematite Suspension based Absorbent Pad Inclined Slider Influenced by Slip and Squeeze Velocity with Altering Film Ratio

Surface roughness effects on non-Newtonian MHD non-parallel squeeze film bearing

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