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

Abstract

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.

Experimental and numerical studies of positive texture effect on friction reduction of sliding contact under mixed lubrication

“…In some of recent studies, the authors analyzed the optimum texture shape for various mechanical tribo-systems under different operating scenarios. 22–28 Rahmani et al. 28 analyzed different bottom shapes of texture such as rectangular, equilateral and isosceles triangular and observed beneficial effects with rectangular textures.…”

“…Furthermore, Ji et al. 26 presented a hydrodynamic lubrication model to study the influence of orientation of elliptical textured bearing. They observed beneficial effects when elliptical dimples were placed parallel to the direction of sliding.…”

Comparison of the Influences of Surface Texture and Boundary Slip on Tribological Performances

“…The optimum texture to gain maximum load-carrying capacity is chevrontype shape with flat front for unidirectional sliding, and it consists of pairs of the trapezoid-like shapes for bidirectional sliding. The effects of the parameters of orientation ellipse dimple such as area density and textured fraction on the performances of hydrodynamic lubrication were analyzed by Ji et al [17]. Besides, Qiu et al investigated the influence of such texture parameters as shape and density on the friction coefficient and stiffness of gas-lubricated bearing, and the optimal geometry in terms of the maximum load-carrying capacity was also obtained [18].…”

Hydrodynamic effect of non-closed elliptical grooves of bi-directional rotation gas face seals

“…Elliptical texture is considered to have better tribological properties of friction reduction and wear resistance, whether in the cylinder/piston ring Khonsari, 2016a, 2016b;Wang et al, 2018a), mechanical seals or machine components (Rosenkranz et al, 2018). The hydrodynamic pressure generated by elliptical texture is stronger because of the converging structure in the direction of motion, resulting in higher load capacity (Ji et al, 2014;Shen and Khonsari, 2016a;Chen et al, 2019). In the gas face seals, elliptical texture as a type of symmetrical structure, presents obvious hydrodynamic effect because of its pumping effect on sealing fluid, and more than 20 per cent greater of the hydrodynamic effect at seal pressure of 0.9 MPa, which has been illustrated in theoretical analysis (Bai et al, 2010(Bai et al, , 2012Ding and Bai, 2017) and experimental investigation.…”