Comparison of the Lubrication Performances of Water-Lubricated and Oil-Lubricated Plain Journal Bearings

Zhang, Xiu Li; Yin, Zhong Wei; Jiang, Dan; Gao, Geng

doi:10.4028/www.scientific.net/amm.711.27

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…The journal-bearing geometry used to simulate fluid flow in this study was adopted from Zhang et al (2014). The Frontiers in Mechanical Engineering frontiersin.org variation case also adopted the angular geometry from Yu Chen et al ( 2017) by adding multistep to the validation geometry.…”

Section: Methodsmentioning

confidence: 99%

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Investigation of the influence of turbulence to tribological performance on smooth and multistep journal bearing with hydrodynamics simulation

et al. 2022

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A bearing is an element that maintains the relative motion between two components in industrial machines, while a journal bearing is often used to maintain the shaft constantly rotating on its axis. Generally, an increase in journal bearings’ performance is essential for industrial development. An increase in engine speed affects the distribution of pressure, temperature, and acoustics. Scientists have proposed various methods to analyze pressure distribution, load-bearing capacity, acoustic power, friction force, cavitation, and elastic phenomena to improve journal bearings’ tribological performance. Therefore, this study aimed to discuss the differences in the flow type modeling between smooth and multistep journal bearings. The results indicated that tribological performance increased significantly in turbulent flow in smooth and multistep journal bearings. The simulation results showed a difference between k-epsilon turbulent flow modeling and k-omega flow modeling.

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Section: Methodsmentioning

confidence: 99%

“…Validation was conducted to perform simulations with the same geometry and boundary conditions as Zhang et al (2014). Future studies should conduct validation with less than 10% error by changing the flow type and multistep additions to the geometry during variation.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the influence of turbulence to tribological performance on smooth and multistep journal bearing with hydrodynamics simulation

et al. 2022

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“…Due to the large specific heat capacity and low viscosity of water, the temperature rise in the water-lubricated TPTBs is so low (Zhang et al, 2015;Litwin, 2015) that an isothermal model is implemented in this study. The extended Reynolds equation as equation ( 5) is implemented using a central differencing scheme on a grid of 41 Â 41 nodes.…”

Section: Boundary Conditions and Solution Proceduresmentioning

confidence: 99%

Investigation of slip/no-slip surface for two-dimensional large tilting pad thrust bearing

Song

Guo

Liu

et al. 2017

ILT

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Purpose This paper aims to present the slip/no-slip design in two-dimensional water-lubricated tilting pad thrust bearings (TPTBs) considering the turbulence effect and shifting of pressure centers. Design/methodology/approach A numerical model is established to analyze the slip condition and the effect of turbulence according to a Reynolds number defined in terms of the slip condition. Simulations are carried out for eccentrically and centrally pivoted bearings and the influence of different slip parameters is discussed. Findings A considerable enhancement in load capacity, as well as a reduction in friction, can be achieved by heterogeneous slip/no-slip surface designs for lubricated sliding contacts, especially for near parallel pad configurations. The optimized design largely depends on the pivot position. The load capacity increases by 174 per cent for eccentrically pivoted bearings and 159 per cent for centrally pivoted bearings for a suitable design. When slip zone locates at the middle of the radial direction or close to the inner edge, the performance of the TPTB is better. Research limitations/implications The simplification of slip effect on the turbulence (definition of Reynolds number) can only describe the trend of the increasing turbulence due to slip condition. The accurate turbulence expression considering the boundary slip needs further explorations. Originality/value The shifting of pressure center due to the slip/no-slip design for TPTBs is investigated in this study. The turbulence effect and influence of slip parameters is discussed for large water-lubricated bearings.

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“…They are used in shipbuilding and industrial equipment for the advantages of environmental friendliness, low cost, and low friction coefficient [1,2]. It is a new tendency that oil-lubricated bearings are being replaced by water-lubricated ones [3,4]. Due to the fact that physical parameters have great differences among water, seawater and lubricating oil, the lubrication performances such as load carrying capacity and temperature rise of water or seawater-lubricated bearings are much more different than those of oil lubricated bearings.…”

Section: Introductionmentioning

confidence: 99%

“…1 The researches for water-lubricated journal bearing is mainly about tribological behavior of bearing material [5,6] and experimental researches of bearing performance [7]- [9]. In our previous work [3], the corresponding relationship of diameter of oil-lubricated and water-lubricated journal bearings was analyzed at a constant load of 3920N. However, the influence of elastic deformation, eccentricity ratio, different bearing diameters and length-diameter ratio were not considered in previous work.…”

Section: Introductionmentioning

confidence: 99%

Study on the performance of journal bearings in different lubricants by CFD and FSI method with thermal effect and cavitation

Wang

Zhong³

et al. 2018

MATEC Web Conf.

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This paper used a new transient computational fluid dynamics and fluid–structure interaction method to investigate the journal bearing performance with the effect of thermal and cavitation, to reveal the performance of journal bearing in different lubricants and to provide substitution references for bearings in different lubricants. Considering thermal effect, elastic deformation and cavitation, a detailed discussion was conducted to show the performance of plain journal bearings lubricated by water, seawater, and lubricating oil by computational fluid dynamics (CFD) and fluid structure interaction (FSI) method. And the results in this work are compared with the published results. The variation of dimensionless load carrying capacity, maximum film pressure and temperature with eccentricity ratio are presented, which can provide reference for the design of bearings. Furthermore, a diagram is presented for journal bearings with different diameter, length-diameter ratio and lubricants, which can be used as a reference for the equivalent substitutions of bearings. The present research provides references as to the design of bearings and the substitutions of bearings by different lubricants.

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Comparison of the Lubrication Performances of Water-Lubricated and Oil-Lubricated Plain Journal Bearings

Cited by 10 publications

References 8 publications

Investigation of the influence of turbulence to tribological performance on smooth and multistep journal bearing with hydrodynamics simulation

Investigation of the influence of turbulence to tribological performance on smooth and multistep journal bearing with hydrodynamics simulation

Investigation of slip/no-slip surface for two-dimensional large tilting pad thrust bearing

Study on the performance of journal bearings in different lubricants by CFD and FSI method with thermal effect and cavitation

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