Thermal-EHL analysis of slip/no-slip contact at high slide-to-roll ratio

Zhao, Yi; Wong, P.L.

doi:10.1016/j.triboint.2020.106617

Cited by 3 publications

(3 citation statements)

References 35 publications

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“…Xiao and Shi [33] numerically investigated the stiffness and damping of transient non-Newtonian thermal EHL point contact for crowned herringbone gears. Zhao and Wong [34] discussed thermal EHL analysis of slip/ no-slip contact at high slide-to-roll ratio and concluded that, the combined mechanism of boundary slip and thermal effects on film formation was revealed numerically. Awati and Kumar [35] discussed the piezo-viscous EHL line contact problem by using Newton-GMRES method with Daubechies D6 wavelet as preconditioner.…”

Section: Introductionmentioning

confidence: 99%

Newton-GMRES-Method for the Scritinization of electric double layer and surface roughness on EHL line contact problem

Awati

Obannavar

2023

JMES

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The electric double layer phenomenon exists on the solid interface under the water-liquid condition. The water molecules are ionized and adhered in the interface forming the sturn layer is a diffused layer in which molecules can move with the movement of bulk of molecules. Because of these two characteristics, the boundary layer of water molecules is called the electric double layer. The aim of present study is to explore the impact of two fraction surfaces of electric double layer (EDL) on a thin water lubricating film on an elastohydrodynamic lubrication (EHL) line contact problem with a sinusoidal surface roughness. The governing modified Reynolds and film thickness equations are based on mathematical model of electro-viscosity of asymmetrical electrical double layer is analyzed numerically. The viscosity-pressure relation of water and theoretical evaluation pertaining to the effect of electric double layer on film-thickness and pressure distribution of EHL with water film of line contact problem is discussed in detail. The effect of zeta potential on film thickness and pressure is determined using Newton’s-GMRES method with Daubechies D6 wavelet as a pre-conditioner. The results predict that, EDL has less impact on pressure distribution and significant impact on film thickness. The obtained results are compared with results of Dowson and Higginson which are comparable.

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Section: Introductionmentioning

confidence: 99%

Newton-GMRES-Method for the Scritinization of electric double layer and surface roughness on EHL line contact problem

Awati

Obannavar

2023

JMES

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“…Zhang et al [43] discussed the variations of oil film pressure, thickness and temperature rise in the contact zone of plate pin pair in silent chains numerically. In order to understand the interplay of boundary slip and heat Zhao and Wong [44] used the complete thermal EHL of a non-wetting/wetting contact under a high slide to roll ratios.…”

Section: Introductionmentioning

confidence: 99%

Multigrid method for the solution of thermal elastohydrodynamic lubrication point contact problem with surface asperities

Awati,

Obannavar,

Nanjaiah

2023

Mech. Eng. Advan.

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The paper presents, the numerical investigation of point contact thermal elasto-hydrodynamic lubrication (EHL) with surface asperities are analyzed. The effect of temperature and surface roughness on fluid film thickness is studied in detail. The governing equations comprises Reynolds, film thickness, load balance and energy equations with appropriate boundary conditions. The second order finite difference approximation is used to discretize the governing equations and the resultant nonlinear system of algebraic equations is solved using Multigrid V-cycle with full approximation scheme (FAS) technique. Multi level multi integration (MLMI) technique is employed to solve the film thickness equation. The obtained results are illustrated in the form of graphs and tables which are comparable with earlier findings. The film thickness profiles shows dimple near to the outlet region due to temperature-viscosity wedge mechanism. Isothermal minimum film thickness is higher than the thermal minimum film thickness. Minimum film thickness is much smaller due to slide to roll ratio is positive ascompared to negative, whereas the behavior of central film thickness is contrast as that of minimum film thickness.

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“…It not only improved the iterative speed of calculation, but also enhanced the calculation accuracy to some extent. Considering the influence of thermal effect on the lubrication characteristics of thermoelastic fluid in line contact, Zhao et al [16,17] established a thermoelastic fluid model, analyzed the change trend of oil film pressure and oil film thickness and studied the influence of thermal effect on the lubrication ability of the contact interface under harsh working conditions. Bai et al [18] established a EHL model and studied the influence of different oil-supply conditions on the lubrication characteristics of bearings.…”

Section: Introductionmentioning

confidence: 99%

Calculation and Lubrication Characteristics of Cylindrical Roller Bearing Oil Film with Consideration of Thermal Effects

Zhang

Guo

et al. 2022

Coatings

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Aiming at the problem of how the thermal characteristics of cylindrical roller bearings affect the lubrication characteristics of bearings under actual working conditions, the influence of parameters such as speed and load on the lubrication characteristics of cylindrical roller bearings under thermal effects is analyzed. The numerical calculation method combining the quasi-static model of cylindrical roller bearing and the thermal elastohydrodynamic lubrication model is adopted. The effects of rotational speed, load and thermal effect on the lubrication performance of the bearing and the lubrication state under certain oil supply conditions were analyzed via numerical model calculation. The oil film thickness was measured via an immersion ultrasonic method to verify the correctness of the model. The results show that the larger the bearing speed, the larger the central film thickness and the minimum film thickness. At the same time, the thermal effect on the film thickness is more obvious; the greater the load, the greater the maximum oil film pressure. The film thickness gradient in the inlet region is greatly reduced, but the thermal effect has no obvious effect on the overall film thickness. In addition, there is a critical value of effective lubrication film thickness for each set of operating parameters. When the actual film thickness is equal to the critical value, the bearing lubrication state is at its best; the numerical simulation results are compared with the experimental values. Under the calculation conditions, the maximum error at the measuring point is within 10%, which meets the error requirements and provides a theoretical basis for revealing the bearing lubrication mechanism.

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Thermal-EHL analysis of slip/no-slip contact at high slide-to-roll ratio

Cited by 3 publications

References 35 publications

Newton-GMRES-Method for the Scritinization of electric double layer and surface roughness on EHL line contact problem

Newton-GMRES-Method for the Scritinization of electric double layer and surface roughness on EHL line contact problem

Multigrid method for the solution of thermal elastohydrodynamic lubrication point contact problem with surface asperities

Calculation and Lubrication Characteristics of Cylindrical Roller Bearing Oil Film with Consideration of Thermal Effects

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