Reynolds Model versus JFO Theory in Steadily Loaded Journal Bearings

Xu, Wanjun; Zhao, Shanhui; Xu, Yan; Li, Kang

doi:10.3390/lubricants9110111

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…However, the diverging region was bound by cavitation, as the fluid failed to sustain the continuous pressure drop below atmospheric pressure. Considering this phenomenon, Reynolds boundary condition was implied in the load-carrying capacity calculation, whereby negative hydrodynamic pressure as a reference to the ambient pressure was taken as cavitation pressure and assigned as zero (Xu et al, 2021). Then lubrication film's load-carrying capacity (F y ) is calculated by the area integral of the pressure (p) distribution.…”

Section: Computing Parametersmentioning

confidence: 99%

Evaluation of tribological performance in contact pairs by implementing the biomimetic surface textures with lubricant flow using CFD techniques

Abhilash,

Ramkumar,

Vengadesan

2024

ILT

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Purpose This paper aims to investigate the tribological benefits of a biomimetic teardrop surface texture inspired by snakeskin compared to conventional surface textures with the help of geometrical and flow parameters using computational fluid dynamics techniques. Design/methodology/approach The lubricant is assumed to be Newtonian, and the flow is laminar with constant viscosity and isothermal property. The governing equations, continuity and Navier–Stokes equation, are discretised by the finite volume method, and cavitation modelling is included. The discretisation for the momentum equations is carried out using the second-order difference method for the SIMPLEC algorithm of pressure–velocity coupling. Findings The results indicate that biomimetic teardrop surface texturing performs better than conventional shapes surface textures in improving tribological performance. Furthermore, the parallel texture orientation along with the flow generates a high-pressure distribution relative to other orientations. Surface texture area density also highly influences the load-carrying capacity, which is optimum at 29%. Zigzag pattern arrangement performs better compared to linear pattern arrangement of texturing. Originality/value The paper proposes that this unique biomimetic teardrop shape can give better tribological performance than conventional shapes. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2024-0053/

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Section: Computing Parametersmentioning

confidence: 99%

Evaluation of tribological performance in contact pairs by implementing the biomimetic surface textures with lubricant flow using CFD techniques

Abhilash,

Ramkumar,

Vengadesan

2024

ILT

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“…studied the effects of inlet pressure and rotating speed on cavitation behaviors. Xu et al. (2021) analyzed the impact of cavitation on the performance of journal bearings and compared the Reynolds model with the Jakobsson–Floberg–Olsson (JFO) theory in predicting oil film reformation boundaries and performance parameters.…”

Section: Introductionmentioning

confidence: 99%

Analysis of turbulent cavitation effects on water-lubricated bearing in single screw compressors

Wang,

Wu,

Zhang

et al. 2024

ILT

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Purpose To guide the stable radius clearance choice of water-lubricated bearings for single screw compressors, this paper aims to analyze the effects of turbulence and cavitation on bearing performance under two conditions of specified external load and radius clearance. Design/methodology/approach A modified Reynolds equation considering turbulence and cavitation is adopted, based on the Jakobsson–Floberg–Olsson boundary condition, Ng–Pan model and turbulent factors. The equation is solved using the finite difference method and successive over-relaxation method to investigate the bearing performance. Findings The turbulent effect can increase the hydrodynamic pressure and cavitation. In addition, the turbulent effect can lead to an increase in the equilibrium radius clearance. The turbulent region exhibits a higher load capacity and cavitation rate. However, the increased cavitation negatively impacts the frictional coefficient and end flow rate. The impact of turbulence increases as the radius clearance decreases. As the rotating speed increases, the turbulence effect has a greater impact on the bearing characteristics. Originality/value The research can provide theoretical support for the design of water-lubricated journal bearings used in high-speed water-lubricated single screw compressors. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2024-0029/

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“…Arif et al [21] established the bearing lubrication analysis model considering Elrod cavitation conditions and optimized the texture and slip design to improve the bearing load capacity. Xu et al [22] established the non-mass conservation lubrication model and the mass conservation model of the journal bearing. The oil film pressure, the bearing load capacity, the attitude angle, friction coefficient, and oil leakage of two models were compared.…”

Section: Introductionmentioning

confidence: 99%

Effect of texture on hydrodynamic journal bearing performance under starvation lubrication

Li¹,

Niu²

2023

Surf. Topogr.: Metrol. Prop.

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The effect of texture on tribological properties of journal bearings operating under starvation lubrication conditions was studied in this paper. The P-θ model with mass conservation boundary conditions was used to accurately predict the oil film distribution in the full oil film/starvation region of the textured bearing; the model was solved numerically, using the finite volume method. Effects of various degrees of starvation lubrication on the tribological performance parameters, such as eccentricity, attitude angle, full film area, and friction coefficient, in textured bearings were discussed. The results have shown that the effect of texture on the bearing performance was affected by starvation lubrication conditions. Further, effect severity varied with starvation levels; however, the texturing still improved the working performance of the journal bearing in the case of weak starvation. Texturing increased the bearing load carrying capacity and reduced the friction coefficient, improving safety and preventing safety accidents due to oil supply problems.

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Reynolds Model versus JFO Theory in Steadily Loaded Journal Bearings

Cited by 8 publications

References 34 publications

Evaluation of tribological performance in contact pairs by implementing the biomimetic surface textures with lubricant flow using CFD techniques

Evaluation of tribological performance in contact pairs by implementing the biomimetic surface textures with lubricant flow using CFD techniques

Analysis of turbulent cavitation effects on water-lubricated bearing in single screw compressors

Effect of texture on hydrodynamic journal bearing performance under starvation lubrication

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