Journal bearings operating with non-newtonian lubricant films

Safar, Z.S.

doi:10.1016/0043-1648(79)90220-5

Cited by 46 publications

(19 citation statements)

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“…If the oil flow is lower than that certain amount the oil flow becomes shorter and x* decreases. Thus the pressure boundary conditions become and p = 0 at x = p = dp/dx = Q at x-x* (16) The condition dp/dx = 0 determines the continuity of the pressure gradient at x = x* and, the pressure as well as the pressure gradient become zero at and after x = x*. These are the usual cavitation boundary conditions.…”

Section: Pressure Boundary Conditionsmentioning

confidence: 93%

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Lubrication of a Cylinder on a Plane With a Non-Newtonian Fluid Considering Cavitation

Sinha

Singh

1982

Journal of Lubrication Technology

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This paper presents a theoretical analysis of lubrication of rolling contact bearings considering cavitation with a non-Newtonian lubricant, obeying the power law model. Piezo-viscous and deformation effects are neglected. The analysis reveals, that as the flow behavior index increases, the load capacity increases and the point of cavitation as well as the point of maximum pressure is shifted towards the center of contact. It is also indicated that the present analysis may be considered as providing an approximation to human joint lubrication problem.

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Section: Pressure Boundary Conditionsmentioning

confidence: 93%

“…Many researchers [1,9,16] have derived the modified Reynolds equation for power law fluid, without specifying the domain for which it exists. The modified Reynolds equation, as will be evident from the present analysis, must be given separately for the regions of positive and negative pressure gradient.…”

Section: Introductionmentioning

confidence: 99%

Lubrication of a Cylinder on a Plane With a Non-Newtonian Fluid Considering Cavitation

Sinha

Singh

1982

Journal of Lubrication Technology

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“…The non-Newtonian lubricants are encountered in various processes of lubrication. During the four last decades, the interest to lubrication problems using non-Newtonian fluids behaviour became extensive [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Journal Bearings Lubrication Aspect Analysis Using Non-Newtonian Fluids

Nessil

Larbi

Belhaneche

et al. 2013

Advances in Tribology

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The aim of this work is related to an analysis of journal bearings lubrication using non-Newtonian fluids which are described by a power-law model. The performance characteristics of the journal bearings are determined for various values of the non-Newtonian power-law index " " which is equal to: 0.9, 1, and 1.1. Obtained numerical results show that for the dilatant fluids (> 1), the load-carrying capacity, the pressure, the temperature, and the frictional force increased while for the pseudo-plastic fluids (< 1) they decreased. The influence of the thermal effects on these characteristics is important at higher values of the flow behavior index ". " Obtained results are compared to those obtained by others. Good agreement is observed between the different results.

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“…Wada and Hayashi (4)- (6) and Swami, Prabhu and Rao (7)- (9) have solved the modified Reynolds equation for a cubic shear stress law and have studied the performance characteristics for finite width bearings. Safar (10) has assumed a polynomial expansion for velocity for the derivation of a modified Reynolds equation and has obtained the load carrying capacity for different eccentricity ratios using a power law for the non-Newtonian flow. Rajalingham et al (11) have used the Reiner-Philippoff model to obtain a modified form of Reynolds equation and have studied the static performance characteristics for finite width bearings.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method

Tayal

Sinhasan

Singh

1981

Journal of Mechanical Engineering Science

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Additives are used to improve the performance of commercial lubricants. These lubricants behave like non-Newtonian fluids (shear thinning or shear thickening). The effect of the nonlinear behaviour on the performance characteristics of finite width journal bearings is investigated using the Prandtl model. The finite element method, using Galerkin's technique, has been used to solve the Navier-Stokes equations in cylindrical coordinates, representing the flow-field in the clearance space of a bearing using Newtonian fluids, and the non-Newtonian effect is introduced by modifying the viscosity term for the model in each iteration. Theresultsapplicable to shearthinning (pseudoplastic) and shear-thickening (dilatant) lubricants are compared with the established results for Newtonian lubricants.'

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Journal bearings operating with non-newtonian lubricant films

Cited by 46 publications

References 1 publication

Lubrication of a Cylinder on a Plane With a Non-Newtonian Fluid Considering Cavitation

Lubrication of a Cylinder on a Plane With a Non-Newtonian Fluid Considering Cavitation

Journal Bearings Lubrication Aspect Analysis Using Non-Newtonian Fluids

Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method

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