The effect of energy accumulation and boundary slip on laminar flow between rotating plates

Wu, Zhenpeng; Zeng, Liangcai; Chen, Keying; Wu, Shiqian

doi:10.1063/1.5020322

Cited by 3 publications

(4 citation statements)

References 32 publications

(43 reference statements)

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“…The above mathematical model is solved by the relaxation iteration method in the MATLAB environment (Wu et al, 2017). Referring to the range of typical lubricating film thickness of hydrodynamic pressure lubrication (Wen and Huang, 2012), and the dynamic viscosity of 46 anti-wear hydraulic oil at 20°C measured by the test (Wu et al, 2018).…”

Section: Analysis Resultsmentioning

confidence: 99%

Study on curved surface design of sliding pair based on stepped topography model

Nguyen

Zeng

2019

ILT

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Purpose The stepped topography of the friction pairs mainly causes the fluid film thickness to change in the direction of motion. In this region, there have very few topographical design methods for continuous or non-linear distribution of the fluid film. The purpose of this study is to analyze the effect of the curved surface on the performance of the liquid film. Design/methodology/approach First, a numerical simulation is used to solve the optimal bearing capacity and friction coefficient of the liquid film under the condition of the minimum film thickness. Then, the curved surface described by the sinusoidal curve equation is applied in the transitional region of maximum and minimum film thickness. The bearing capacity and the friction coefficient of the liquid film are respectively simulated and compared in the same condition of the minimum film thickness. Findings The research results show that the liquid film using the curved surface transition model, the optimal bearing capacity is significantly increased by 32 per cent while the optimal friction coefficient is clearly reduced by 38 per cent in comparison with using stepped surface model. Originality/value The friction pair with curved transition enables better lubrication performance of the liquid film and better adaptability under unstable conditions.

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Section: Analysis Resultsmentioning

confidence: 99%

Study on curved surface design of sliding pair based on stepped topography model

Nguyen

Zeng

2019

ILT

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“…The time, the range of the typical lubrication film thickness of the dynamic fluid lubrication, the viscosity of No. 46 anti-wear hydraulic oil and the range of the boundary slip length are equal to the values measured by many experiments and are summarized in (Wu et al , 2018; Srinivasan et al , 2015). Table I shows the selected simulation parameters.…”

Section: Simulation Solutionmentioning

confidence: 98%

Optimization of hydrodynamic lubrication performance based on a heterogeneous slip/no-slip surface

Ding

Zeng

et al. 2019

ILT

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Purpose This paper aims to use the method of curve splicing to combine the slip zone and the no-slip zone to further improve the lubrication performance of the liquid film. The combination of the slip zone and the no-slip zone of an existing heterogeneous surface is still a single line stitching method so that a very large residual space at the surface of the friction pairs remains present, necessitating further improvement of the joining scheme between the slip zone and the no-slip zone in heterogeneous surfaces. Design/methodology/approach A set of discrete sinusoids is used as the splicing track for both the slip zone and the no-slip zone, the starting point and amplitude of the curve are introduced as the simulation variables and the effects of these variables on the bearing capacity and friction coefficient of the liquid film are comprehensively analyzed. Findings The results show that the method of selecting the sinusoidal curve as the slip zone and the no-slip zone trajectory, which is based on the existing method of linear stitching, can further enhance the bearing capacity and reduce the friction coefficient of the liquid film. Originality/value This method can further enhance the bearing capacity and reduce the friction coefficient of the liquid film.

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“…The numbers of meshes m × n are taken as 62 × 62, thus, the numbers of nodes are 63 × 63. Based on the parameters of the thrust bearing model, 8 the dynamic viscosity of 46 anti-wear hydraulic oil at 40°C measured by the test in Ref., 18 and the range of slip lengths obtained from many experiments in Refs., 19,20 the simulation parameters of the model are listed in Table 1.…”

Section: Linear Stitching and Curvilinear Stitchingmentioning

confidence: 99%

“…Thus, the friction resistance can be obtained by integrating the shear stress on the surface with the expression of shear stress described in equations ( 16)− (17). Then, the friction coefficient can be obtained by the ratio of friction resistance to bearing capacity, as shown in equations (18).…”

Section: Boundary Condition and Outputmentioning

confidence: 99%

An optimal method of distribution of the slip zone on thrust bearing surfaces

Nguyen

Dong

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Research to achieve a reasonable distribution of the slip zone of the sliding pair for better improvement of the hydrodynamic pressure of the liquid film is an intractable topic. To solve this issue, this paper takes the thrust bearing as the research object, and proposes to use the position number of the grid nodes at the boundary line between the slip and no-slip zone in each radial zone of the inclined pad to be variables. The variables are then defined as chromosomes in an adaptive genetic algorithm (AGA) and used to optimize the bearing capacity of the tilting pad. The results show that the optimal method of the AGA, which has good stability and repeatability, remarkably improves the distribution of the slip zone on the surface of the inclined pad. Therefore, the bearing capacity of the liquid film is significantly improved. Particularly, by using the optimization, the boundary line between the slip/no-slip zone is a composite form of a part of an arc and a part of the whisker. When the liquid flow through the heterogeneous slip/on-slip surfaces is used by this composite splicing method, the liquid pressure is upgraded in two steps. This is more conducive to increasing the pressure on multiple areas on the surface of the tilting pad, thereby achieving higher bearing capacity.

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The effect of energy accumulation and boundary slip on laminar flow between rotating plates

Cited by 3 publications

References 32 publications

Study on curved surface design of sliding pair based on stepped topography model

Study on curved surface design of sliding pair based on stepped topography model

Optimization of hydrodynamic lubrication performance based on a heterogeneous slip/no-slip surface

An optimal method of distribution of the slip zone on thrust bearing surfaces

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