Hydrodynamic lubrication of finite porous bearings

Murti, P. R. K.

doi:10.1016/0043-1648(72)90447-4

Cited by 24 publications

(9 citation statements)

References 3 publications

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“…Rhodes and Rouleau 11 examined the performance of a narrow porous bearing with sealed ends using the Darcy equation. Murti [12][13][14] used the preceding results to analyze long porous bearings and then extended the problem to short, finite porous bearings. Tichy 15 proposed a lubrication model sliding on the thin film on a porous layer using the Darcy equation combined with the Reynolds equation.…”

Section: Introductionmentioning

confidence: 99%

Lubrication characteristics of a textured porous sliding bearing

Lee

Jang

Wang

et al. 2015

Advances in Mechanical Engineering

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This study investigates the lubrication characteristics of a textured bearing sliding on a porous layer. To properly implement the porous layer effect in the bearing, the Brinkman-extended-Darcy model is employed, which results in a modified Reynolds equation. This equation is then evaluated to examine the effects of the porous layer's material and geometric properties on the lubrication characteristics through the use of (semi-)analytic and numerical approaches. The cavitation effect is reflected in the numerical treatment of the model equation, and an adaptive finite difference scheme is employed to efficiently model the bearing system with finite dimples that may be far smaller than the overall bearing dimensions. Along with the variation trends of the bearing performance with respect to the material and geometric properties of the porous layer, the pattern effects of textured surfaces on the bearing performance indices (load capacity and equivalent friction coefficient) are also thoroughly investigated. Here, the pattern comprised a set of regularly spaced identical dimples either in semi-spherical or semi-ellipsoidal shape, and the effects of size and orientation of the dimples are comprehensively explored to separately identify their influence on the bearing performance indices.

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Section: Introductionmentioning

confidence: 99%

Lubrication characteristics of a textured porous sliding bearing

Lee

Jang

Wang

et al. 2015

Advances in Mechanical Engineering

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“…Porous journal bearings found its application in different industrial machineries like generators, water-pumps, sewing-machines and in home appliances like vacuum-cleaners, hair-driers, shaving-machines etc. Several researchers have presented studies on porous journal bearings [20][21][22][23], in which they considered Darcy's law with certain Japanese Society of Tribologists (http://www.tribology.jp/)…”

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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“…Self lubricating porous journal bearings are broadly utilized in modern applications in view of their long existence with no outer supply of lubricants. A broad investigation of porous journal bearings has been made amid the most recent couple of decades, Cameron [3], Roulean [4], Wu [5], Bhatt [6] and Murthi [7][8]. Such experiments were performed with Newtonian lubricants.…”

Section: Introductionmentioning

confidence: 99%

Performance Characteristics of a Long Porous Partial Journal Bearing using Couple Stress Fluid

Nisha*,

Govindarajan

2019

IJRTE

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After effects of studies led on a long porous partial journal bearing for couple stress fluid are thus displayed. Performance characteristics presently determined incorporate the time-height relationship, Fluid film force, Flow rate, frictional force alongside the coefficient of friction. Plan/Technique/Approach -The paper shows a solution for the squeeze film lubrication of a thick, porous, with couple stress fluid model. It is determined that the changed Reynolds condition inferred the fluid film pressures. The modified state of Reynolds equation is analytically solved and closed form expressions are shown for the time-height, the flow rate and friction force with frictional coefficient numerically with the given starting condition using MATLAB programming, the first non-linear equation in the time-height relationship is resolved. The effects on the squeeze film characteristics of couple stresses and permeability are discussed. Findings – It can be seen that the couple stress parameter enhances the bearing characteristics. The bearing performance can be improved with the increase of couple stress parameter ( l  ), eccentricity ratio (ϵ), permeability parameter (ψ). Additional study may be performed using the couple stress fluid model, including the magnetic effect with heat and mass transfer. This model can be used to compare further with other models such as micropolar fluid, rabinowitsch fluid and for comparative study, which models are the most suitable for improving bearing system performance.

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Hydrodynamic lubrication of finite porous bearings

Cited by 24 publications

References 3 publications

Lubrication characteristics of a textured porous sliding bearing

Lubrication characteristics of a textured porous sliding bearing

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

Performance Characteristics of a Long Porous Partial Journal Bearing using Couple Stress Fluid

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