Micropolar fluid lubrication of one-dimensional journal bearings

Zaheeruddin, Kh.; Isa, Mohammad

doi:10.1016/0043-1648(78)90069-8

Cited by 47 publications

(24 citation statements)

References 5 publications

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“…The lubrication theory of micropolar fluids was first presented by Allen and Kline [15] by using the order of magnitude analysis for the simplification of governing equations to a system of coupled, linear, ordinary differential equations. The micropolar fluids theory has been used by several investigators for the study of different bearing systems such as journal bearings [16][17][18], slider bearings [19,20], squeeze film bearings [21][22][23][24][25], and porous bearings [26,27]. These studies revealed some of the advantages of micropolar fluids over the Newtonian lubricants, such as increased load-carrying capacity and delayed time of approach for squeeze film bearings.…”

Section: Introductionmentioning

confidence: 99%

On the squeeze film lubrication of rough short porous partial journal bearings with micropolar fluids

Naduvinamani

Santosh²,

Siddanagouda³

2009

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this article, a theoretical study of the effect of surface roughness on the squeeze film characteristics of short porous partial journal bearing lubricated with micropolar fluids is made. The modified averaged Reynolds equation accounting for the randomized surface roughness structure is mathematically derived. The Christensen stochastic theory of hydrodynamic lubrication of a rough surface is used to study the effect of two types of one-dimensional (1D) surface roughness on the squeeze film characteristics of a short porous partial journal bearing with micropolar fluid. It is assumed that the roughness asperity heights are small compared to the film thickness. It is observed that the transverse surface roughness pattern improves the squeeze film characteristics, whereas the squeeze film bearing performance is affected due to the presence of 1D longitudinal surface roughness. These effects are more pronounced for the micropolar fluids.

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Section: Introductionmentioning

confidence: 99%

On the squeeze film lubrication of rough short porous partial journal bearings with micropolar fluids

Naduvinamani

Santosh²,

Siddanagouda³

2009

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The oil flow Q oxi of the ith hydrostatic bearing pad in the x i direction is obtained by integrating equation (12)…”

Section: Recess Pressurementioning

confidence: 99%

Numerical analysis of a rigid rotor mounted on four-pad hydrostatic squeeze film damper lubricated with micropolar lubricant

Benariba

Bouzidane

Thomas

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present work deals with a numerical resolution of the modified Reynolds equation using micropolar lubrication theory to study the effects of coupling number and the characteristic length of the micropolar lubricant on the performance characteristics of hydrostatic squeeze film damper, which consists of four hydrostatic pads fed through four capillary restrictors. According to the results, the bearing operating with micropolar lubricant shows an increase in the value of pressure inside the recess. These results suggest that the influence of micropolar effect on the bearing performance is predominantly affected by the pressure ratio. Therefore, the bearing operator must judiciously choose an appropriate value of the pressure ratio in order to get an overall enhanced bearing performance.

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“…Prakash and Sinha [7] constructed the Reynolds equation for a hydrodynamic bearing with micropolar lubricant. A number of research works on micropolar lubrication in case of plain journal bearings [8][9][10][11][12][13][14][15][16][17] show beneficial effects of micropolar fluid over Newtonian fluid having higher load carrying ability and lower friction coefficient. Because of these advantages micropolar fluid has found common usages as lubricants, especially in the form of long-chain polymer additives with the Newtonian fluid in most of the engine oils [18].…”

Section: Introductionmentioning

confidence: 99%

Porous Hydrodynamic Journal Bearing Analysis Using Micropolar Fluid in Steady-State Condition

Baidya¹,

Das

2019

Tribology Online

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The objective of the present work is to study theoretically, the steady-state performance of finite hydrodynamic porous journal bearings under micropolar lubrication. The fluid pressure in porous matrix follows Darcy's equation. In the film zone, the modified Reynolds equation is developed considering micropolar lubrication theory. Both Darcy's and modified Reynolds equations are solved using finite difference technique with successive over-relaxation method to obtain the steady-state film pressure. The steady-state performance characteristics are evaluated in terms of non-dimensional load carrying ability, friction force and friction parameter of a finite journal bearing for different values of micropolarity viz, l m and N, and varying characteristics of porous bearing. The results show that the micropolar fluid is better than the Newtonian fluid when load carrying ability and friction parameters are concerned. The slip has a beneficial effect in terms of increase in load carrying ability and reduction in friction parameter approximately to 0.7, beyond which the advantage diminishes. l m exhibits an optimal value around 10.0. In case of industrial machinery and home appliances which uses the porous bearings and where the lubricant either gets contaminated with micro-elements or dust, mixing of additives will return better results.

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Micropolar fluid lubrication of one-dimensional journal bearings

Cited by 47 publications

References 5 publications

On the squeeze film lubrication of rough short porous partial journal bearings with micropolar fluids

On the squeeze film lubrication of rough short porous partial journal bearings with micropolar fluids

Numerical analysis of a rigid rotor mounted on four-pad hydrostatic squeeze film damper lubricated with micropolar lubricant

Porous Hydrodynamic Journal Bearing Analysis Using Micropolar Fluid in Steady-State Condition

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