Lubricant Rheological Behavior Effect Analysis on the Performance of
                        Finite Porous Self- Lubricating Journal Bearings

Malki, Maamar; Larbi, Salah; Boubendir, S.; Bennacer, Rachid

doi:10.29252/jafm.11.06.28883

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…This is because the power law model accurately characterizes the dilatant and pseudo plastic fluids which characterizes the shear thickening and shear thinning of lubricants respectively which are both non-Newtonian, [8,9]. The power law model is mostly preferred because of its mathematical simplicity and it gives a realistic variation of temperature unlike the other models, [10].…”

Section: Nomenclaturesmentioning

confidence: 99%

Power Law Fluid Model for Thermal Elastohydrodynamic Lubrication

Karimi

Gathungu

2021

JAMCS

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The aim of this paper is to analyse thermal elastohydrodynamic lubrication (TEHL) line contact of rolling a bearing using a non-Newtonian uid that is described by the power law model. The performance characteristics of the rolling bearing are determined for various index for dilatant, Newtonian and pseudo plastic uids. The one-dimensional Reynolds and energy equations are both modied to incorporate the non-Newtonian nature of the lubricant. The coupled system of governing equations are discretized using the finite difference method and solved simultaneously. The results show that the pressure, film thickness and temperature for dilatant uids increased with increase in the ow index as compared to pseudo plastic uids. The in uence of thermal effects on pressure and lm thickness is more significant compared with that under isothermal elastohydrodynamic lubrication especially on the case of dilatant uids. The viscosity of the lubricant increases with increase in pressure and reduces with increment in temperature. The surface roughness in the bearing surface increases the lm thickness of the lubricant. The uid pressure, film thickness and temperature increases with increase in the bearing speed. To truly re ect the characteristics of EHL models, thermal effects should be considered.

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Section: Nomenclaturesmentioning

confidence: 99%

Power Law Fluid Model for Thermal Elastohydrodynamic Lubrication

Karimi

Gathungu

2021

JAMCS

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“…In order to improve the behavior of journal bearings with elastic bearing liner, it is necessary to use innovative oils with high lubricating power, which allows optimizing the performance of the mechanism and consequently the increase of its service life. This is why the Newtonian hypothesis is not always satisfactory for many lubricating fluids [12,14].…”

Section: Introductionmentioning

confidence: 99%

“…Additives are used in these lubricants to improve the performance of lubrication. Among these models we can cite : the couple stress model [15,16], the micropolar fluid model [17,18], the power law model [3,12], and Rabinowitsch model [19,20].…”

Section: Introductionmentioning

confidence: 99%

Elastic Deformation Effects on Self-Lubricating Journal Bearings Using Pseudo-Plastic Lubricants

Malki¹,

Larbi

Boubendir

et al. 2021

Tribology Online

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In this study, we have analyzed the effect of elastic deformations on the static characteristics of finite self-lubricating journal bearings. This analysis takes into account the rheological lubricant behavior which obeys to Rabinowitsch law. The governing equations considering both the fluid flow in the porous bush and the fluid film lubricant are based on Rabinowitsch fluid model and solved numerically using the finite difference method. The static performances of the porous journal bearings have been investigated for various parameters such as the elastic deformation parameter, the nonlinear factor which characterizes the pseudo-plastic fluid, the eccentricity ratio and the bush permeability. Obtained results demonstrated that the pseudo-plastic lubricant decreases the characteristics of the porous journal bearings compared to the Newtonian fluid lubricant. This reduction is more pronounced where the effect of both elasticity and permeability of the bush have been considered.

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“…Whereas, an oil leakage and a lower load capacity compared with solid journal bearings are disadvantages. To improve its tribological properties, a considerable number of studies concerning the lubrication mechanism of oil-impregnated journal bearings have been conducted [5][6][7][8][9]. The basic model of fluid flow over a permeable block have proposed by Beavers and Joseph [10].…”

Section: Introductionmentioning

confidence: 99%

“…Based on their researches, several 3D numerical studies have reported recently. Malki et al simulated the effect of permeability to porous journal bearings [6]. They presented that when the permeability increases, the maximum pressure and the load capacity decrease, and the attitude angle increase.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties and Oil Flow Observation of Porous Sintered Metal with Dimple Texturing by Block-on-Disk Friction Tester

et al. 2019

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Presence of micrometer-scale textures on a surface can modify the friction properties of that surface. In this study, we investigated the fundamental tribological properties of Cu-Sn porous sintered metal with the rounded rectangle dimple texturing under hydrodynamic lubrications. The results of block-on-disk tribological tests and in-situ oil flow observations revealed that the presence of dimple texturing on the sliding surface increases the friction coefficient of porous specimens. From the visualization of oil effused regions on porous surfaces, it was observed that the position of the maximum peak of oil film pressure distribution is shifted toward the outlet direction of oil flow as a result of dimple texturing. In case of porous sintered metal, addition of dimple texturing enhanced the absorbance of lubricating oil into the interconnected pores and caused a reduction in the oil film thickness.

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Lubricant Rheological Behavior Effect Analysis on the Performance of Finite Porous Self- Lubricating Journal Bearings

Cited by 8 publications

References 27 publications

Power Law Fluid Model for Thermal Elastohydrodynamic Lubrication

Power Law Fluid Model for Thermal Elastohydrodynamic Lubrication

Elastic Deformation Effects on Self-Lubricating Journal Bearings Using Pseudo-Plastic Lubricants

Tribological Properties and Oil Flow Observation of Porous Sintered Metal with Dimple Texturing by Block-on-Disk Friction Tester

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