Non-Newtonian and Thermal Effects in Journal Bearings

Derdouri, A.; Carreau, Pierre J.

doi:10.1080/10402008908981875

Cited by 12 publications

(4 citation statements)

References 21 publications

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“…Various studies related to the impact of non-Newtonian lubricant using finite difference and finite element methods (FEMs) as well as experimental analysis on the journal-bearing performance are covered in the literary works. [12][13][14][15][16][17][18][19][20][21][22][23][24] Rajalingham et al 12 studied the impact of linear and non-linear correlations of pseudo-plastic lubricants on the steady-state performance of journal bearing. They outlined that the correlation effect strongly affects the bearing performance at smaller aspect ratio and pseudoplasticity reduces the performance parameters except for the attitude angle.…”

Section: Introductionmentioning

confidence: 99%

“…17 The lubricant viscous property losses as a result of shear-thinning have not been compensated for by elastic properties of polymer-added lubricants even at high rotational speed as described by Derdouri and Carreau. 18 Linear and non-linear orbits for finite circular bearing after modifying the viscosity term in the governing equations using cubic shear law model to find the stability of such bearings in non-Newtonian lubrication regime have been obtained by Sinhasan and Goyal. 19 Malik et al 20 figured out the dynamic performance of journal bearing using cubic shear stress fluid model and have presumed that apparent viscosity is not dependent on the coordinates across the oil film by evaluating it at the average shear rate within the oil film.…”

Section: Introductionmentioning

confidence: 99%

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Performance of finite bearing under the combined influence of turbulent and non-Newtonian lubrication

Soni

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The current numerical investigation is used to predict the dynamic performance of finite bearing considering the combined influence of turbulence regime and non-Newtonian flow. With appropriate assumptions, the Navier–Stokes and continuity equation have been revised by the linear turbulence and non-Newtonian fluid model together. The clearance space of the finite bearing has been determined by the finite element method adopting Galerkin’s procedure and robust iteration technique. The cylindrical coordinate forms of momentum and continuity equations are used for the flow field of the finite bearing assuming the turbulent regime and non-Newtonian lubricant. Dynamic performance parameters of a finite bearing have been computed regarding direct and cross-coupled fluid-film coefficients, equivalent stiffness coefficient, whirl ratio, and critical mass at different eccentricity ratios for distinct values of Reynolds numbers preferably up to 13,300 and varied values of non-linear factor of the non-Newtonian fluid model. The obtained results revealed the performance enhancement in the combined regime as compared to pure turbulence and non-Newtonian flow conditions. The stability of finite bearing is significantly improved under the proposed severe flow regime.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of finite bearing under the combined influence of turbulent and non-Newtonian lubrication

Soni

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Of these Bartz and Wissusseck [5] found that, under their experimental conditions, the viscoelastic effects are negligible. Derdouri and Carreau [6] have shown that the viscosity loss due to shear thinning is not compensated for by the elastic properties of these polymer-added oils, even when the bearing is run at high rotational speeds. Hutton e t a l [ 7 ] , in their experimental analysis, have shown that journal hearings with an elastic lubricant carry more load than with an equiviscous inelastic lubricant.…”

mentioning

confidence: 99%

Thermodynamic lubrication of non-Newtonian journal bearings: theory and experiments

Sheeja¹,

Prabhu²

1992

J. Phys. D: Appl. Phys.

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The performance characteristics of a plain journal bearing are studied theoretically using a thermodynamic analysis of a bearing lubricated by a nonlinear (cubic) fluid model. Experimental investigations are carried out on a simple journal bearing test rig to study the performance of a full journal bearing with different types of non-Newtonian lubricants, including water-based fluid (WBF). Experiments include the measurement of eccentricity ratio, critical speed and stability limit. A comparative study of the bering performance is carried out by using two oils which have the same zero shear rate viscosity but different rheological behaviour. The results show that the bearing performance of non-Newtonian oil largely depends on the rheological behaviour of the oil. A comparative study of the theory and experiment is also attempted

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“…Making use of the zero-shear rate viscosity qo and the time constant X E , our objective is to derive simple correlations that could be used in the solution of the journal bearing problem in an attempt to understand whether the viscoelastic properties of a polymer-added oil enhance the load capacity and under what conditions (Derdouri, 1985;Derdouri and Carreau, 1988).…”

mentioning

confidence: 99%

Rheological properties of polymer‐added lubricating oils

Derdouri¹,

Aı̈t-Kadi²,

Carreau³

1988

Can J Chem Eng

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Rheological measurements of polyisobutylene solutions are presented. A mineral oil of low viscosity has been used as solvent. The combined effects of concentration, molecular weight and temperature were studied. It is found that the rheological data, when plotted as N1λE/(η‐ηs) versus λEγ fall on a master curve over several decades of the dimensionless shear rate, irrespective of temperature, polymer concentration and molecular weight. The findings of this work can be used to address the problem of hydrodynamic lubrication of a journal bearing using a viscoelastic lubricant.

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Non-Newtonian and Thermal Effects in Journal Bearings

Cited by 12 publications

References 21 publications

Performance of finite bearing under the combined influence of turbulent and non-Newtonian lubrication

Performance of finite bearing under the combined influence of turbulent and non-Newtonian lubrication

Thermodynamic lubrication of non-Newtonian journal bearings: theory and experiments

Rheological properties of polymer‐added lubricating oils

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