Numerical analysis of journal bearings lubricated with micropolar fluids including thermal and cavitating effects

Wang, Xiaoli; Zhu, Konglin

doi:10.1016/j.triboint.2005.01.028

Cited by 83 publications

(96 citation statements)

References 17 publications

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“…Figure 6 shows the cross-section through the 3D pressure distribution in the central plane of the bearing, where pressure tappings were made by Dowson et al [26]. The experimental measurements are shown, as well as the numerical predictions made by Wang and Zhu [53], which are based on Elrod's cavitation model [17] and those from the current CFD analysis. The area under all the pressure distributions, being the lubricant reaction remains the same.…”

Section: Model Validationmentioning

confidence: 92%

“…A two-stage validation process is undertaken. Firstly, the model predictions are compared with the experimental measurements reported by Dowson et al [26], which have been used for the same purpose by other research workers, including Tucker and Keogh [25], and Wang and Zhu [53]. Dowson et al [26] measured the lubricant pressure distribution in a restricted grooved journal bearing (Fig.…”

Section: Model Validationmentioning

confidence: 99%

“…All the pressure distributions commence from the supplied inlet pressure of (not an imposed boundary condition) for the lubricant film rupture point. The different exit boundary conditions, as well as the embodied assumption of a constant pressure gradient into the depth of the lubricant film with a constant dynamic viscosity through its thickness made by Wang and Zhu [53] yield slightly different pressure profiles. Clearly, lack of artificially imposed assumptions with the CFD analysis yields results which conform more closely to the experimental measurements.…”

Section: Model Validationmentioning

confidence: 99%

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Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

et al. 2015

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The paper presents a mixed thermo-hydrodynamic analysis of elliptic bore bearings using combined solution of Navier-Stokes, continuity and energy equations for multi-phase flow conditions. A vapour transport equation is also included to ensure continuity of flow in the cavitation region for the multiple phases as well as Rayleigh-Plesset to take into account the growth and collapse of cavitation bubbles. This approach removes the need to impose artificial outlet boundary conditions in the form of various cavitation algorithms which are often employed to deal with lubricant film rupture and reformation. The predictions show closer conformance to experimental measurements than have hitherto been reported in the literature. The validated model is then used for the prediction of frictional power losses in big end bearings of modern engines under realistic urban driving conditions. In particular, the effect of cylinder deactivation (CDA) upon engine bearing efficiency is studied. It is shown that bigend bearings losses contribute to an increase in the brake specific fuel consumption with application of CDA contrary to the gains made in fuel pumping losses to the cylinders. The study concludes that implications arising from application of new technologies such as CDA should also include their effect on tribological performance.

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Section: Model Validationmentioning

confidence: 92%

Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

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Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

et al. 2015

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“…Elrod method regards that the lubrication is compressible fluid, gets the relation of density and pressure, and controls that the full oil film region is 1 and cavitation region is 0 by switch function [3,4].…”

Section: The Generalize Reynolds Equation Withmentioning

confidence: 99%

“…Félix et al [2] analyzed the effect of surface roughness in hydrodynamic bearings using the finite differences discretization techniques and multigrid methods. Wang et al [3,4] computed the characteristics of journal bearings lubricated with micropolar fluids considering cavitating effects. Shinde et al [5] investigated the performance characteristics of conical shape hydrodynamic journal bearing with partial texturing, and results showed that bearing surface with partial texturing along 900-1800 region resulted in 42.08 % enhancement in maximum fluid film pressure compared with smooth surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spiral Angle on the Performance of Spiral Oil Wedge Sleeve Bearing

Wang

Zeng

Zhang

2018

International Journal of Rotating Machinery

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Spiral angel is an important structure parameter of spiral oil wedge sleeve bearing, which produces greater impact on bearing performance. Based on JFO boundary condition, the generalized Reynolds equations considering four slip conditions are established. Using the concept of partial derivatives, stiffness and damping coefficients of sleeve bearing are calculated. The results show that carrying capacity and friction drag of oil film decrease, temperature rise decreases first and then increases, and end leakage rate, stiffness, and damping coefficients generally increase first and then decrease with the increase of spiral angle. The carrying capacity, friction drag, temperature rise, stiffness, and damping coefficients are smaller and the end leakage rate is higher considering wall slip and JFO condition compared with reckoning with no slip and Reynolds boundary condition.

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Performance analysis of flexible multirecess hydrostatic journal bearing operating with micropolar lubricant

Verma¹,

Kumar²,

Gupta³

2012

Lubrication Science

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This paper presents the analytical study of the effect of the bearing shell flexibility on the performance of multirecess hydrostatic journal bearing system operating with micropolar lubricant. The modified Reynolds equation for the flow of micropolar lubricant through constant flow valve‐compensated hydrostatic journal bearing has been solved by finite element technique based on Galerkins method, and the resulting elastic deformation in the bearing shell due to fluid‐film pressure has been determined iteratively, in which the deformation coefficient accounts for the bearing shell flexibility. The computed results suggest that the influence of the micropolar effect on bearing performance characteristics is significantly affected by the bearing shell flexibility. Copyright © 2012 John Wiley & Sons, Ltd.

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Numerical analysis of journal bearings lubricated with micropolar fluids including thermal and cavitating effects

Cited by 83 publications

References 17 publications

Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

Influence of Spiral Angle on the Performance of Spiral Oil Wedge Sleeve Bearing

Performance analysis of flexible multirecess hydrostatic journal bearing operating with micropolar lubricant

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