A parametric study on bubbly lubrication of high-speed journal bearings

Chun, Sang Myung

doi:10.1016/s0301-679x(01)00072-x

Cited by 25 publications

(12 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, simulation shows a great discrepancy between the results from the two models. Another thermohydrodynamic model for oil aeration turbulent lubrication was developed based on the viscosity and density model by Nikolajsen [3,4] , and the conclusion was that bubbles will increase the oil viscosity, while dramatically improve the load capacity and peak pressure of the oil film [4][5][6] . On the contrary, a conclusion given in Refs [7,8] indicates that the load capacity of the oil film will decrease with the amount of the bubble.…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, a conclusion given in Refs [7,8] indicates that the load capacity of the oil film will decrease with the amount of the bubble. The density model for oil aeration lubrication was developed based on one-dimensional Reynolds' equation without considering the thermal effect of the oil aeration lubricant [3][4][5][6][7][8][9] . In addition, the generalized Reynolds equation based on theflowcontinuity of the mixture and the viscosity of pure oil was developed to study the oil aeration turbulent lubrication [10] .…”

Section: Introductionmentioning

confidence: 99%

“…Diaz and San Andre´s present the theoretical models and experimental results about natural air entrainment in an open-ended squeeze film journal bearing [12,13] . However, for the models mentioned above, the equivalent viscosity formula and equivalent density formula of the mixed fluid used in the model are phenomenological formulas, lead to the conflicting results [3,4,7,8] . Moreover, comparing with single-phase flow, the two-phase flow has a phase interface between the two-phases, and the momentum and energy transfer occur at the interfacetwo-phase.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Thermohydrodynamic Coupling Model of Oil Aeration Turbulent Lubrication for Journal Bearing With Interface Effect

Lin

Jiang

Hua

et al. 2015

Journal of Tribology

View full text Add to dashboard Cite

Oil aeration lubricant in high-speed journal bearing is composed mixture of continuous phase liquid and discrete phase bubbles. This work establishes a thermohydrodynamic coupling model for this lubrication condition. The generalized Reynolds equation is derived by the continuity equation, Navier-Stokes equation, law of wall turbulence model and bubble volume distribution function, and then a thermohydrodynamic (THD) oil aeration turbulent lubrication model is established by coupling the generalized Reynolds equation, energy equation, force equilibrium equation of bubble and population balance equations (PBE). The coupled-equations are solved numerically to obtain the pressure distribution under oil aeration lubrication state, the equilibrium distribution of bubble volume, the turbulent velocity distribution, the bubble velocity distribution, and the temperature rise.The results show that the load capacity of a bearing with oil aeration lubrication model is higher than that of the same bearing with a pure oil lubrication model, and heat dissipation performance of the bearing under the oil aeration lubrication state is superior. A c c e p t e d M a n u s c r i p t N o t C o p y e d i t e dDownloaded From: http://ebooks.asmedigitalcollection.asme.org/ on 06/15/2015 Terms of Use: http://asme.org/terms 2

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Thermohydrodynamic Coupling Model of Oil Aeration Turbulent Lubrication for Journal Bearing With Interface Effect

Lin

Jiang

Hua

et al. 2015

Journal of Tribology

View full text Add to dashboard Cite

show abstract

“…El-Butch (2001) investigated on the influence of bubbly oil on the performance of tilting pad journal bearings under rotating unbalance load. A parametric study on bubbly lubrication of high speed journal bearings has been done by Chun (2002). He has examined the influence of aerated oil on high speed journal bearings by classical thermo hydrodynamic lubrication theory coupled with analytical models for viscosity and density of the air-oil mixture.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of externally pressurised step bearing including centrifugal inertia effect for a bubbly lubricant

Gautam¹,

Quamar²,

Ghosh³

2011

Int. J. Eng. Sci. Tech

View full text Add to dashboard Cite

A numerical study has been done for externally pressurized circular step thrust bearing lubricated with incompressible fluid with finely dispersed air bubbles taking into consideration the variation in lubricant physical properties due to temperature and pressure variation in the fluid film. Effect of misalignment / tilt and coning on cavitations region has also been investigated. The air bubbles are seen to improve the pressure distribution. It also reduces cavitations domain that occurs because of the centrifugal inertia force. Load carrying capacity is seen to improve but both mass flow rate and frictional power consumed decrease. Overall, the presence of air bubble improves the performance of the bearing. It is seen that tilt and coning reduces the cavitations region.

show abstract

“…The oil film's performance in fluid lubrication technology directly affects the reliability of operation, life, and economic indicators [1]. Currently, the effects of viscosity change, surface roughness, and temperature on lubrication have been studied through experiments and numerical simulation methods [2][3][4][5][6][7][8][9][10]. In the studies, the oils were always considered as Newtonian fluid.…”

Section: Introductionmentioning

confidence: 99%

Rheological behavior’s effect on the work performance of oil film

et al. 2011

View full text Add to dashboard Cite

A 3D model of hydrostatic turntable's oil chamber is established to investigate the lubricants performance with different rheological properties by using FLUENT software and the finite volume method. Newtonian oil and non-Newtonian oil's performance under varied speeds are compared on the large size hydrostatic turntable system considering the temperatureviscosity relationship and pressure-viscosity relationship. The results show that the property of non-Newtonian fluid viscosity influenced by shear rate largely affects the lubricants performance for most oil added polymer additives. Lubricants cannot simply be regarded as Newtonian fluid. The shear thickening non-Newtonian fluid has a better work property. The results are important to design a large size and high-speed hydrostatic support system, choose lubricant oils, and investigate oil film's work properties.

show abstract

A parametric study on bubbly lubrication of high-speed journal bearings

Cited by 25 publications

References 12 publications

A Thermohydrodynamic Coupling Model of Oil Aeration Turbulent Lubrication for Journal Bearing With Interface Effect

A Thermohydrodynamic Coupling Model of Oil Aeration Turbulent Lubrication for Journal Bearing With Interface Effect

Thermal analysis of externally pressurised step bearing including centrifugal inertia effect for a bubbly lubricant

Rheological behavior’s effect on the work performance of oil film

Contact Info

Product

Resources

About