Calculated load capacity of non-newtonian lubricants in finite width journal bearings

Swamy, S.T.N.; Prabhu, B.S.; Rao, B.V.A.

doi:10.1016/0043-1648(75)90162-3

Cited by 44 publications

(9 citation statements)

References 8 publications

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“…0 p represents the pressure distribution of the non-Newtonian medium without considering the effect of the extrusion and the first normal stress function. 1 p indicates the pressure distribution considering the effect of extrusion, while 2 p shows the pressure distribution considering the normal stress function. As the movement of the oil film in normal direction caused by the radial motion of the axle center, the pressure of the oil film increase obviously under the effect of the first normal stress function.…”

Section: Effect Of the First Normal Stress Functionmentioning

confidence: 99%

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Calculated journal bearing lubrication of non-Newtonian medium with surface roughness effects

Chen

Wang

et al. 2006

Front. Mech. Eng. China

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To analyze the effects of non-Newtonian lubricants and surface roughness in journal bearing lubrication, a modified Reynolds equation is derived. In the equation, differential viscosity and the first normal stress function are defined to specify the rheological properties of non-Newtonian medium. Flow factors are used to specify the effect of surface roughness. The modified Reynolds equation is numerically calculated using super over relaxation method. Numerical results of the lubrication show that the differential viscosity is the principal non-Newtonian property affecting the lubrication, it is determined by the material parameters of the lubricant and is affected by the shearing rate. Under its effect, the load capacity of non-Newtonian lubricants is not always higher or lower than that of Newtonian lubricants'. The effect of the first normal stress difference increases under the conditions of dynamic loading. Surface roughness shows an obvious effect on load capacity when it is greater than one-tenth of the film thickness, and the surface with longitudinal pattern affects the load capacity most. However, surface roughness has less effect on lubrication results than lubricants' non-Newtonian property.

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Section: Effect Of the First Normal Stress Functionmentioning

confidence: 99%

“…The researches [1,2] on bearing lubrications show that macromolecule additive can increase the viscosity and load capacity of the basic oil and improve the lubrication result. This kind of lubricant has non-Newtonian characteristics.…”

Section: Introductionmentioning

confidence: 99%

Calculated journal bearing lubrication of non-Newtonian medium with surface roughness effects

Chen

Wang

et al. 2006

Front. Mech. Eng. China

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“…It is a one-parameter model and has been commonly used for lubrication problems [18][19][20][21]. The constitutive equation for the cubic shear law is described in non-dimensional form as…”

Section: The Non-newtonian Modelmentioning

confidence: 99%

Analysis of thermal effects in capillary compensated hole-entry hybrid journal bearings lubricated with a non-Newtonian lubricant

Garg

Kumar

2009

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present work describes the performance characteristics of the capillary compensated symmetric and asymmetric hole-entry hybrid journal bearing systems considering the combined influence of the temperature rise and the non-Newtonian behaviour of the lubricant. The required governing equations have been solved using the finite-element method and a suitable iterative technique. The non-Newtonian lubricant has been assumed to follow the cubic shear stress law. The thermohydrostatic rheological performance of symmetric and asymmetric hole-entry hybrid journal bearing configurations is studied. The computed results show that the variation of viscosity due to the temperature rise and the non-Newtonian behaviour of the lubricant affects the performance of the hole-entry hybrid journal bearing system quite significantly.

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“…Equation (6) in the nondimensional form is T = A sin-1 (?Ill) (7) p is taken as the second invariant of shear strain rate and the expression for p is taken as (16) r (equation 7) is the corresponding equivalent shear stress.…”

Section: Non-newtonian Modelmentioning

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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Calculated load capacity of non-newtonian lubricants in finite width journal bearings

Cited by 44 publications

References 8 publications

Calculated journal bearing lubrication of non-Newtonian medium with surface roughness effects

Calculated journal bearing lubrication of non-Newtonian medium with surface roughness effects

Analysis of thermal effects in capillary compensated hole-entry hybrid journal bearings lubricated with a non-Newtonian lubricant

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

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