Applicable Equation Study of Lubrication Calculation of Surface Texture Based on CFD Analysis

Ma, Chenbo

doi:10.3901/jme.2011.15.095

Cited by 6 publications

(6 citation statements)

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“…The total actual contact area and normal load of two rough surfaces can be represented as [24][25][26][27]…”

Section: A Normal Load and Contact Area Of Solid Contact Partmentioning

confidence: 99%

Tangential Contact Stiffness Model of Solid-Liquid Interface Under Mixed Lubrication

Peng,

Ban,

Gao

et al. 2024

IEEE Access

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In order to analyze and predict the performance of mechanical structure and system, the tangential contact of solid-liquid interface under normal and tangential loads is studied, and the tangential stiffness model of rough surfaces is established by analyzing various contact states of the asperity under normal elastic-plastic deformation and tangential stick-slip.Based on the contact model of closed oil pits based on the influence of rough surfaces, on the basis of fully considering the influence of gradual application of load on the number of closed oil pit, and then changing the load distribution of solid-liquid interface, a liquid tangential stiffness model is established. The tangential stiffness of solidliquid interface is obtained by two parts in parallel. Through simulation and experimental analysis, the effects of normal load, deformation and lubricant viscosity on the tangential stiffness of solid-liquid interface are revealed, and the tangential stiffness with or without lubricating medium is compared and analyzed. The results show that the tangential stiffness of solid-liquid interface and solid-solid interface increases nonlinearly with the increase of normal load and deformation. Due to the contribution of liquid stiffness, the tangential stiffness of solid-liquid interface is always slightly higher than that of solid-solid interface. The greater the viscosity of the lubricating medium, the greater the tangential stiffness of the solid-liquid interface. At low load, liquid contact is dominant, and the tangential stiffness of solid-liquid interface is low. Under moderate and heavy loads, the solid contact is dominant, and the tangential stiffness of the solid-liquid interface increases rapidly. Therefore, the tangential contact stiffness of the solid-liquid interface in mixed lubrication can be effectively improved by increasing the normal load and increasing the viscosity of the lubricating medium.

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“…The total actual contact area and normal load of two rough surfaces can be represented as [24][25][26][27]…”

Section: A Normal Load and Contact Area Of Solid Contact Partmentioning

confidence: 99%

Tangential Contact Stiffness Model of Solid-Liquid Interface Under Mixed Lubrication

Peng,

Ban,

Gao

et al. 2024

IEEE Access

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“…Some prefer the Reynolds equation due to its good conformity between theoretical analysis and experimental tests [30][31][32], whereas others recommend the more accurate N-S equation [33][34][35] due to consideration of the fluid inertial term. By referring to the study of the application scope of the Reynolds equation in surface texture theoretical modeling [36], it has been shown that the influence of the inertia term can be ignored when the clearance ratio L/h ≥ 46 (h is the film thickness, and L is the typical length of friction pair), in which case the Reynolds equation can replace the N-S equation for The friction simulation results in Figure 2b show that the maximum stress values of the triangle texture are the largest (the values of the upper and bottom sliders are 21.29 MPa and 30.9 MPa, respectively), whereas the values of the diamond, ellipse, and hexagon textures are relatively smaller. The results of the upper and bottom sliders are given 60% and 40% weights, respectively, for comprehensive evaluation.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Some prefer the Reynolds equation due to its good conformity between theoretical analysis and experimental tests [30][31][32], whereas others recommend the more accurate N-S equation [33][34][35] due to consideration of the fluid inertial term. By referring to the study of the application scope of the Reynolds equation in surface texture theoretical modeling [36], it has been shown that the influence of the inertia term can be ignored when the clearance ratio L/h ≥ 46 (h is the film thickness, and L is the typical length of friction pair), in which case the Reynolds equation can replace the N-S equation for numerical analysis, but with consideration of the effect of the cavitation phenomenon on pressure distribution.…”

Section: Mathematical Modelmentioning

confidence: 99%

Effects of Snake-Bioinspired Surface Texture on the Finger-Sealing Performance under Varied Working Conditions

et al. 2022

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The tribological performance of the friction pair between the rotor and finger feet is a crucial index affecting the service life of finger seals. In recent years, the surface texture has attracted a considerable number of researchers owing to its extraordinary potential in improving antifriction and wear resistance. This paper, inspired by snakeskins, introduces three texture forms (e.g., diamond, ellipse, and hexagon) into the rotor. The effects on finger-sealing performance are analyzed by considering finger seals’ varied working conditions. First, a numerical model of textured finger seals under hydrodynamic lubrication is established based on the Reynolds equation. Then, the sealing performance analysis of textured finger seals is performed considering varied working conditions given rotation speed, pressure difference, seal clearance, and working temperature. The numerical results show that: (1) the textured domain produces a noticeable hydrodynamic pressure effect and cavitation, which effectively improves the bearing capacity of the fluid film; (2) the higher the rotation speed or the lower the inlet/outlet pressure difference, the stronger the dynamic pressure effect of textured finger seals and the better the antifriction and wear resistance; (3) for good antifriction and wear resistance of a textured finger seal, the seal clearance should be as shallow as possible (≤10 μm), and the working temperature should be as low as possible (≤120 °C); and (4) the ellipse texture has a higher average dimensionless pressure and a lower friction coefficient, which is superior to diamond and hexagon ones in terms of friction and wear performance.

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“…The results show that the k-e RNG model is more accurate to predict flow fields involving large flow separation. Ma et al 32 find that the turbulence occurs around the asperities, which leads to the declination of load-bearing capacity; this means that the physical parameters of lubricant change quickly and significantly with time and position. Therefore, the RNG k-e turbulent model, proposed by Launder and Spalding, 33 is adopted in the simulation because it is applicable for calculation of turbulent flow especially when the streamlines are bent largely due to the surface texture.…”

Section: Numerical Simulationmentioning

confidence: 99%

Influence of surface roughness on the friction property of textured surface

Zhou

Zhu

Zhang

et al. 2015

Advances in Mechanical Engineering

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In contrast with dimple textures, surface roughness is a texture at the micro-scale, essentially which will influence the load-bearing capacity of lubricant film. The numerical simulation was carried out to investigate the influence of surface roughness on friction property of textured surface. The lubricant film pressure was obtained using the method of computational fluid dynamics according to geometric model of round dimple, and the renormalization-group k-e turbulent model was adopted in the computation. The numerical simulation results suggest that there is an optimum dimensionless surface roughness, and near this value, the maximum load-bearing capacity can be achieved. The load-bearing capacity is determined by the surface texture, the surface roughness, and the interaction between them. To get information of friction coefficient, the experiments were conducted. This experiment was used to evaluate the simulation. The experimental results show that for the frequency of 4 and 6 Hz, friction coefficient decreases at first and then increases with decreasing surface roughness, which indicates that there exists the optimum region of surface roughness leading to the best friction reduction effect, and it becomes larger when area fractions increase from 2% to 10%. The experimental results agree well with the simulation results.

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Applicable Equation Study of Lubrication Calculation of Surface Texture Based on CFD Analysis

Cited by 6 publications

References 0 publications

Tangential Contact Stiffness Model of Solid-Liquid Interface Under Mixed Lubrication

Tangential Contact Stiffness Model of Solid-Liquid Interface Under Mixed Lubrication

Effects of Snake-Bioinspired Surface Texture on the Finger-Sealing Performance under Varied Working Conditions

Influence of surface roughness on the friction property of textured surface

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