One-dimensional porous journal bearings lubricated with micropolar fluid

Isa, Mohammad; Zaheeruddin, Kh.

doi:10.1016/0043-1648(80)90054-x

Cited by 18 publications

(16 citation statements)

References 8 publications

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“…The development of the three-dimensional Reynolds equation for micropolar fluid-lubricated bearing from the balance equations of micropolar fluid was shown by Singh et al [10], and they also solved the same using conventional assumptions to compute the frictional drag, shear stress, flow flux and frictional torque. Isa et al [11] analysed the porous journal bearing with one dimension under the micropolar lubrication and found the increase in the capacity to carry load and decrease in the coefficient of friction due to the presence of contaminated substrates in the micropolar lubricant. On the other hand, they also showed, with respect to the permeability of porous bearing, the coefficient of friction increases and load capacity decreases as the porosity increases and vice versa.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of single-layered porous short journal bearing under the lubrication of micropolar fluid

Bhattacharjee

Chakraborti

Choudhuri

2019

J Braz. Soc. Mech. Sci. Eng.

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The imperative characteristics of micropolar (non-Newtonian) fluid-lubricated short single-layered porous journal bearing are analysed theoretically by an iterative method. With the presence of very few available data for micropolar lubrication, the results acquired in the present study are compared with previously published results using the conventional lubricant and found to be in the perfect covenant. The modified Reynolds equation in case of micropolar fluid is derived and solved numerically to investigate bearing characteristics and to show the comparison with published results in the form of design charts. The results established that the micropolar fluid significantly improves lubricating conditions and load capacity as compared with the corresponding Newtonian case. It has been observed that micropolar fluid-lubricated porous journal bearing gives high load-carrying capacity than other conventional lubricants.

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Section: Introductionmentioning

confidence: 99%

Theoretical analysis of single-layered porous short journal bearing under the lubrication of micropolar fluid

Bhattacharjee

Chakraborti

Choudhuri

2019

J Braz. Soc. Mech. Sci. Eng.

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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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“…The generalized Reynolds equation derived by Isa et al. 25 governed the pressure distribution within a porous journal bearing lubricated with a micropolar fluid and solved for an infinitely long and short porous journal bearings. It was predicted that the enhancement in the load capacity as the concentration of additives increase in the lubricant, and it decreased with the alteration in the size of the substructure.…”

Section: Introductionmentioning

confidence: 99%

Steady-state performance of elliptical contact lubricated with micropolar fluids

Dewangan

Sarangi

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this work, the numerical investigation is done for the steady-state performance of elliptical contacts lubricated with micropolar fluids. The Eringen’s micro-continuum theory is applied to deduce the modified Reynolds equation for micropolar fluids. The modified Reynolds equation is discretized by the finite difference technique and evaluated by a multigrid technique for finding the steady-state pressure distribution; simultaneously, the elasticity equation is solved with the multilevel multi-integration method. The numerical solution is achieved under isothermal conditions and considering the exponential variation of viscosity with pressure. The effect of micropolar parameters, i.e. nondimensional characteristics length defines the molecular length of the blended additives, and coupling number measures the coupling between the angular and linear momentum of molecules, and operating parameters are studied. Owing to the analysis, the pronounced effect of the micropolar parameters on the elastohydrodynamic lubrication of elliptical contacts is observed and which cannot be avoided. Lubricants added with solid additives and coupling between linear and angular momentum improved the overall film thickness and pressure and enhanced the load-carrying capacity. Also, a nominal rise in the traction coefficient is noticed, but this increase in the traction coefficient is quite less when compared to Newtonian fluids.

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One-dimensional porous journal bearings lubricated with micropolar fluid

Cited by 18 publications

References 8 publications

Theoretical analysis of single-layered porous short journal bearing under the lubrication of micropolar fluid

Theoretical analysis of single-layered porous short journal bearing under the lubrication of micropolar fluid

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

Steady-state performance of elliptical contact lubricated with micropolar fluids

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