Hydrodynamic Lubrication of Conformal Contacting Surfaces With Parabolic Grooves

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Yonghong Fu ◽  
Jinghu Ji ◽  
Qinsheng Bi
Keyword(s):  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Orientation Angle ◽  
Groove Depth ◽  
Groove Width ◽  
Hydrodynamic Effect ◽  
Geometrical Parameters ◽  
Average Pressure ◽  
Minimum Film Thickness ◽  
Effect Of Surface

The effect of surface texturing in the form of parabolic grooves on the hydrodynamic lubrication properties is investigated in this paper. Numerical simulation of the pressure distribution of lubricant between a textured slider and a smooth, moving slider has been performed. The evaluation criterion of hydrodynamic effect of dimensionless average pressure is calculated and presented with the variation of minimum film thickness, groove width, groove depth, spacing and orientation angle. Optimum values of geometrical parameters such as the dimensionless groove depth, spacing and orientation angle are obtained which correspond to maximum average pressure. It is also noted that the average pressure increases monotonically with increasing groove width. The results show that the hydrodynamic effect can be improved by employing optimized surface texturing design.

Influence of Geometric Shapes on the Hydrodynamic Lubrication of a Partially Textured Slider With Micro-Grooves

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Jinghu Ji ◽  
Yonghong Fu ◽  
Qinsheng Bi
Keyword(s):  
Multigrid Method ◽  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Hydrodynamic Pressure ◽  
Groove Depth ◽  
Geometric Shape ◽  
Groove Width ◽  
Operating Parameters ◽  
Average Pressure ◽  
Area Density

The effect of partial surface texturing in the form of parabolic grooves, rectangular grooves, and triangular grooves on the hydrodynamic pressure is investigated in the present work. The dimensionless hydrodynamic pressure generated by the partial surface texturing is obtained by the multigrid method. The effect of the texturing parameters on the dimensionless average pressure is analyzed for a given set of operating parameters. The results indicate that the geometric shape, area density, groove depth, and orientation of the grooves have an obvious influence on the hydrodynamic pressure. However, the groove width has little effect on the dimensionless average pressure. The results of the present work demonstrate that surface texturing design is very important to generate additional hydrodynamic pressure according to the operating parameters of the mechanical components.

Effect of Elliptical Dimples on Hydrodynamic Lubrication

2015 ◽  
Vol 645-646 ◽  
pp. 474-479 ◽  
Author(s):  
Jing Hu Ji ◽  
Hao Wang ◽  
Yong Hong Fu
Keyword(s):  
Analytical Model ◽  
Inclination Angle ◽  
Hydrodynamic Lubrication ◽  
Grid Method ◽  
Hydrodynamic Pressure ◽  
Hydrodynamic Effect ◽  
Operating Parameters ◽  
Geometrical Parameters ◽  
Average Pressure ◽  
Lubrication Performance

This paper develops an analytical model to investigate the effect of elliptical dimples on hydrodynamic lubrication of surface contact. The hydrodynamic pressure generated by elliptical dimples is solved by the multi-grid method. The evaluation criterion of hydrodynamic effect of dimensionless average pressure is calculated and presented with the variation of elliptical dimple depth, area density, slender ratio and inclination angle. The results indicate that geometrical parameters of elliptical dimples have an obvious influence on the hydrodynamic pressure. The hydrodynamic lubrication performance can be ameliorated by optimizing the geometrical parameters of elliptical dimples according to the operating parameters of the mechanical components.

The influence of partially textured slider with orientation ellipse dimples on the behavior of hydrodynamic lubrication

2014 ◽  
Vol 66 (2) ◽  
pp. 161-167 ◽  
Author(s):  
Jinghu Ji ◽  
Yonghong Fu ◽  
Qinsheng Bi
Keyword(s):  
Pressure Distribution ◽  
Design Methodology ◽  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Grid Method ◽  
Hydrodynamic Effect ◽  
Operating Parameters ◽  
Average Pressure ◽  
Content Type ◽  
Proper Design

Purpose – The purpose of this paper is to investigate a partially textured slider of infinite width with orientation ellipse dimples in liquid application. Design/methodology/approach – In this paper, the pressure distribution of lubrication between a partially textured slider and a smooth sliding slider is calculated by the multi-grid method. For the same dimple area, the influence of the ellipse dimple with geometric parameters, and distribution and orientation on the hydrodynamic lubrication is evaluated in terms of the dimensionless average pressure for a given set of operating parameters. Findings – In the present work, the magnitude of the dimensionless average pressure seems proportional to the slender ratio. Consequently, the slender ratio may be chosen as large as possible based on fabrication techniques. The longer axes of ellipse dimples placed parallel to the direction of sliding always show the better hydrodynamic effect. Furthermore, the results show that the ellipse dimples can greatly improve hydrodynamic effect of partially surface textured slider of infinite width by proper design of these texturing parameters. Originality/value – This paper develops a partial surface texturing infinitely width slider with orientation ellipse dimples for improving hydrodynamic lubrication.

The effect of surface texturing in soft elasto-hydrodynamic lubrication

2009 ◽  
Vol 42 (2) ◽  
pp. 284-292 ◽  
Author(s):  
A. Shinkarenko ◽  
Y. Kligerman ◽  
I. Etsion
Keyword(s):  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Effect Of Surface

scholarly journals Hydrodynamic Lubrication of Partially Textured Gas Parallel Slider Bearings with Orientation Ellipse Dimples

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Fuxi Liu ◽  
Zhanlong Li ◽  
Chunjie Yang ◽  
Hongbao Wu ◽  
Huazhu Yin ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hydrodynamic Lubrication ◽  
Orientation Angle ◽  
Hydrodynamic Pressure ◽  
Geometric Parameters ◽  
Average Pressure ◽  
Sliding Speed ◽  
Slider Bearings ◽  
Lubrication Performance

The hydrodynamic lubrication performance of partially textured gas parallel slider bearings with orientation ellipse dimples is investigated in this paper. By using the multigrid finite element method, the pressure distribution between a partially textured slider and a smooth slider is obtained. The geometric parameters of the ellipse dimples are optimized to maximize the average pressure under a given sliding speed. The numerical results show that geometric parameters such as orientation angle, depth, slender ratio, and area density have an important impact on hydrodynamic pressure. Besides, the effect of textured fraction on hydrodynamic pressure is investigated under a given sliding speed. It is observed that the optimum textured fraction for maximizing the average pressure is dependent on the sliding speed.

On the Lubrication of Rough Rollers

1984 ◽  
Vol 106 (2) ◽  
pp. 211-217 ◽  
Author(s):  
J. Prakash
Keyword(s):  
Surface Roughness ◽  
Stochastic Model ◽  
Film Thickness ◽  
Hydrodynamic Lubrication ◽  
Roughness Parameter ◽  
Dimensionless Parameters ◽  
Surface Roughness Parameter ◽  
Cylinder Radius ◽  
Minimum Film Thickness ◽  
Effect Of Surface

Christensen’s stochastic model of hydrodynamic lubrication as extended to two sided roughness is used to study the effect of surface roughness in the analysis of lightly loaded rollers in combined rolling, sliding and normal motion. A detailed study of the above system in terms of dimensionless parameters, Q (involving the normal and entraining velocity, the minimum film thickness and the equivalent cylinder radius); the slide roll ratio and the surface roughness parameter is made for purely longitudinal and purely transverse surface roughness.

Numerical optimization of surface texture for improved tribological performance of journal bearing at varying operating conditions

2018 ◽  
Vol 70 (9) ◽  
pp. 1608-1618 ◽  
Author(s):  
Ali Usman ◽  
Cheol Woo Park
Keyword(s):  
Journal Bearing ◽  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Tribological Performance ◽  
Operating Conditions ◽  
Content Type ◽  
Load Carrying ◽  
Recent Developments ◽  
Effect Of Surface ◽  
Generalized Reynolds Equation

Purpose Journal bearings are used in numerous rotary machines. The load carrying capacity and friction of a bearing have been major concerns in design. Recent developments in surface texturing have showed potential outcomes to improve the tribological characteristics of mating surfaces. This study aims to investigate surface textures, which are transverse to the sliding direction, for frictional response of the journal bearing. Design/methodology/approach A hydrodynamic lubrication model is considered to evaluate the effect of surface texturing on the performance of a journal bearing at varying operating conditions. The two-dimensional generalized Reynolds equation, coupled with mass-conserving Elrod cavitation algorithm, is solved to evaluate texture-induced variations in tribological performance parameters. Findings Results have showed remarkable improvements in frictional response. Moreover, micro-textures on the journal surface alter the cavitation response and film-reformation in the hydrodynamic conjunction of the plain bearing. Originality/value Operating condition-based comprehensive exhaustive optimization of texture geometry is performed to generate widespread conclusion.

Effect of the Geometry of Groove on Connection Strength of the Hydraulically Expanded Tube-to-Tubesheet Joints of Heat Exchangers

2004 ◽  
Author(s):  
H. F. Wang ◽  
Z. F. Sang ◽  
G. E. O. Widera
Keyword(s):  
Heat Exchangers ◽  
Groove Depth ◽  
Groove Width ◽  
Geometrical Factor ◽  
Geometrical Parameters ◽  
Connection Strength ◽  
Average Residual ◽  
Calculation Results ◽  
Stress And Deformation ◽  
Axisymmetrical Model

The object of this paper is to investigate the effect of geometry of a groove on the connection strength of hydraulically expanded tube-to-tubesheet joints of heat exchangers. Seven-tube models with different groove width, depth, spacing and location were fabricated under the same expansion pressure by commercial hydraulic expanders. Then the corresponding pullout forces were gained by experimental means. In addition, the process of hydraulic expansion of tube-to-tubesheet joints was simulated using the nonlinear finite element method based on a 2-D axisymmetrical model. The residual stress and deformation of joints were determined, and the effect of geometrical parameters of the grooves on the connection strength of joints was studied in terms of the average residual contact pressure of the joints. The experimental and calculation results indicate that the most important geometrical factor for determining the connection strength is the groove width. Groove depth, spacing and location have a secondary effect. Optimum geometrical sizes of grooves are proposed based on maximum axial strength. These can provide a reference for the revision of design and manufacturing codes.

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