The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform

Yanhu Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Hydrodynamic Lubrication of textured infinitely long slider with cross-hatched texture
    Meccanica, 2019
    Co-Authors: Baodong Dong, Fu Hao, Wei Wang, Yanhu Zhang
    Abstract:

    An analytical model for the textured infinitely long slider is developed to study the influence of cross-hatched texture on Hydrodynamic Lubrication by considering the mass-conserving boundary condition. The three-dimensional morphology of the cross-hatched texture is characterized by a series of mathematical formulas. By using multigrid method and Gauss–Seidel iteration, the Hydrodynamic pressure distribution of textured surface can be obtained to analyze the influence of width, depth, spacing, cross-hatched angle and overlapping coefficient of the cross-hatched texture on the Hydrodynamic Lubrication. The results show that Hydrodynamic Lubrication can be generated between two parallel plane surfaces with cross-hatched texture. Moreover, the geometrical parameters of the cross-hatched texture have prominent effect on Hydrodynamic pressure distribution and load carrying capacity.

G.k. Lal - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of cold strip rolling under Hydrodynamic Lubrication
    Journal of Materials Processing Technology, 1996
    Co-Authors: S. Saxena, P.m. Dixit, G.k. Lal
    Abstract:

    Abstract A model is proposed for cold strip rolling under Hydrodynamic Lubrication which combines the finite-element analysis of the strip with the refined analysis of the lubricant film. The viscosity of the lubricant is assumed to depend on both the pressure and the strain rate, whilst the strip is modelled as rigid-perfectly plastic material. The thickness of the lubricant film is assumed to vary parabolically from inlet to exit. The effects of various process variables (the reduction, the roll-radius-to-strip-thickness ratio, the lubricant viscosity and the roll velocity) on the interfacial stresses, the roll force and torque and the film thickness are studied. It is shown that the interfacial normal stress remains generally uniform over the arc of contact and in no case develops a ‘friction-hill’. In the proposed model, the roll force remains virtually unaffected by both the lubricant viscosity and the roll velocity and thus remains insensitive to Lubrication. At high reduction or for a low value of the roll-radius-to-strip-thickness ratio, the film thickness becomes very small, requiring the use of high-viscosity lubricant or a large roll speed to maintain Hydrodynamic Lubrication.

Baodong Dong - One of the best experts on this subject based on the ideXlab platform.

  • Hydrodynamic Lubrication of textured infinitely long slider with cross-hatched texture
    Meccanica, 2019
    Co-Authors: Baodong Dong, Fu Hao, Wei Wang, Yanhu Zhang
    Abstract:

    An analytical model for the textured infinitely long slider is developed to study the influence of cross-hatched texture on Hydrodynamic Lubrication by considering the mass-conserving boundary condition. The three-dimensional morphology of the cross-hatched texture is characterized by a series of mathematical formulas. By using multigrid method and Gauss–Seidel iteration, the Hydrodynamic pressure distribution of textured surface can be obtained to analyze the influence of width, depth, spacing, cross-hatched angle and overlapping coefficient of the cross-hatched texture on the Hydrodynamic Lubrication. The results show that Hydrodynamic Lubrication can be generated between two parallel plane surfaces with cross-hatched texture. Moreover, the geometrical parameters of the cross-hatched texture have prominent effect on Hydrodynamic pressure distribution and load carrying capacity.

Fu Hao - One of the best experts on this subject based on the ideXlab platform.

  • Hydrodynamic Lubrication of textured infinitely long slider with cross-hatched texture
    Meccanica, 2019
    Co-Authors: Baodong Dong, Fu Hao, Wei Wang, Yanhu Zhang
    Abstract:

    An analytical model for the textured infinitely long slider is developed to study the influence of cross-hatched texture on Hydrodynamic Lubrication by considering the mass-conserving boundary condition. The three-dimensional morphology of the cross-hatched texture is characterized by a series of mathematical formulas. By using multigrid method and Gauss–Seidel iteration, the Hydrodynamic pressure distribution of textured surface can be obtained to analyze the influence of width, depth, spacing, cross-hatched angle and overlapping coefficient of the cross-hatched texture on the Hydrodynamic Lubrication. The results show that Hydrodynamic Lubrication can be generated between two parallel plane surfaces with cross-hatched texture. Moreover, the geometrical parameters of the cross-hatched texture have prominent effect on Hydrodynamic pressure distribution and load carrying capacity.

  • Influence of short grooves on Hydrodynamic Lubrication of textured infinitely long sliders
    Advances in Mechanical Engineering, 2018
    Co-Authors: Fu Hao, Shuchang Zhao, Xijun Hua
    Abstract:

    The influence of geometrical parameters of the short grooves on the Hydrodynamic Lubrication is studied in this article. Based on Reynolds equation and Jakobsson–Floberg–Olsson cavitation theory, an analytical model is developed to investigate the Hydrodynamic Lubrication of the short grooves. The study employs a multigrid method to calculate the distribution of Hydrodynamic pressure and the average pressure of textured surfaces. The results indicate that the interactions between neighboring short micro-grooves and the end effect on the Hydrodynamic pressure should be considered in the process of numerical simulation. There exist the optimum values of horizontal spacing and short micro-groove depth to maximize the Hydrodynamic pressure. The average film pressure decreases with the increase in the vertical spacing, but it increases alongside the short groove width. The increase rate of the average pressure declines gradually as the short groove length grows. Therefore, Hydrodynamic Lubrication performance ...

J M Khodadadi - One of the best experts on this subject based on the ideXlab platform.

  • the effect of nanoparticles on thin film elasto Hydrodynamic Lubrication
    Applied Physics Letters, 2013
    Co-Authors: Hamed Ghaednia, Hasan Babaei, Robert L Jackson, Michael J Bozack, J M Khodadadi
    Abstract:

    Carefully conducted friction tests of a nano-lubricant in the thin film elasto-Hydrodynamic Lubrication regime showed that the presence of nanoparticles reduces friction. By using surface analyses techniques and molecular dynamics simulations, we explored the effectiveness of different interactions in the system, namely the interactions between nanoparticles with the lubricant or surfaces. Based on the results, the friction reduction mechanism was found to be that the nanoparticles induce an obstructed flow (plug flow) in the thin film between lubricated surfaces. This reduces friction by forcing only a few layers of lubricant molecules to slide on each other.