Effect of Magnetohydrodynamic Couple Stresses on Dynamic Characteristics of Exponential Slider Bearing

Naduvinamani, N. B.; Siddangouda, A.; Siddharam, P.

doi:10.24874/ti.2017.39.01.04

Cited by 5 publications

(3 citation statements)

References 16 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: 98%

Non-Newtonian couple stress lubrication of MHD elastic journal bearings

Kardoudi

Nabhani

Khlifi

2022

ILT

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“…However, in the evolution of modern engineering, the role of non-Newtonian squeeze-flow is vital. Numerous scholars have analysed the squeezing flow problem with various non-Newtonian fluid models [19][20][21][22][23][24][25]. Amongst of these non-Newtonian models, couple stress fluid model proposed by Stoke's [26] has been given considerable attention by various investigators in field of fluid mechanics.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetite nanoparticles on couple stress fluid between two parallel squeezing and expanding surfaces

2020

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This article investigates the analysis of hydromagnetic flow of a couple stress fluid through two parallel squeezing surfaces where magnetite nanoparticles are suspended in it. Here ethylene glycol is considered as the base fluid. The dissipations due to magnetic field, viscous and couple stress fluid are considered in the energy equation. The modelled governing differential equations are transformed into dimensionless form of nonlinear coupled ordinary differential equations with the aid of similarity transformations. A shooting method with Runge-Kutta 4th order is utilized to solve the system of reduced flow field equations. The influence of various parameters on the velocity (axial and radial) components and temperature are studied for squeezing and expanding cases for distinct physical parameter through graphs. The results indicate that the axial velocity and temperature show increasing trend for augmenti values of couple stress fluid parameter. Further, radial velocity and temperature also depict augmenting trend for all increasing values of Hartmann number.

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