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Research Papers: Hydrodynamic Lubrication

Influence of Donut-Shaped Bump on the Hydrodynamic Lubrication of Textured Parallel Sliders

[+] Author and Article Information
Hao Fu, Yonghong Fu, Xijun Hua

School of Mechanical Engineering,
Jiangsu University,
301 Xuefu Road,
Zhenjiang 212013, Jiangsu, China

Jinghu Ji

School of Mechanical Engineering,
Jiangsu University,
301 Xuefu Road,
Zhenjiang 212013, Jiangsu, China
e-mails: andyjee@163.com;
jijinghu@ujs.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 31, 2017; final manuscript received December 20, 2017; published online February 23, 2018. Assoc. Editor: Stephen Boedo.

J. Tribol 140(4), 041706 (Feb 23, 2018) (9 pages) Paper No: TRIB-17-1304; doi: 10.1115/1.4039163 History: Received July 31, 2017; Revised December 20, 2017

The influence of donut-shaped bump texture on the hydrodynamic lubrication performance for parallel surfaces is presented in this paper. A mathematical equation has been applied to express the shape of three-dimensional donut-shaped bump texture. Numerical simulation of the pressure distribution of lubricant between a textured slider and a smooth, moving slider has been performed to analyze the geometrical parameters' influence on the hydrodynamic performance for textured surfaces. The numerical results show that the convex of the donut-shaped bump provides a microstep slider, which can form a convergent wedge and build up hydrodynamic pressure. Optimum values of horizontal spacing and bump height are obtained to maximize the hydrodynamic pressure. It is also noted that the average pressure increases monotonically with the increase of bump radius, but decreases with the increase of vertical spacing and dimple depth, respectively.

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Figures

Grahic Jump Location
Fig. 6

A donut-shaped bumps column of an infinitely long slider

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Fig. 5

Geometric features of the shaped-donut bump: (a) three-dimensional shape and (b) two-dimensional cross section shape

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Fig. 4

A laser surface textured surfaces with donut-shaped bumps

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Fig. 3

Cross section of a laser surface textured parallel sliders with donut-shaped bumps

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Fig. 2

Schematic diagram of laser textured composite-shaped texture [9]

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Fig. 1

Three general types of surface textures: (a) dent-shaped texture [6], (b) bump-shaped textures [7], and (c) composite-shape texture [9]

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Fig. 7

A multigrid V-cycle for M = 3

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Fig. 8

(a) The dimensionless film thickness distribution, (b) dimensionless film pressure distribution, (c) dimensionless film thickness and pressure along X-direction at Y = 0, and (d) contour plot of dimensionless film pressure (Nb = 1)

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Fig. 9

(a) The dimensionless film thickness distribution, (b) dimensionless film pressure distribution, (c) dimensionless film thickness and pressure along X-direction at Y = 0, and (d) contour plot of dimensionless film pressure (Nb = 5)

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Fig. 10

The effect of dimensionless horizontal spacing, Sx, on the dimensionless average pressure, Pav, for various values of number of donut-shaped bumps, Nb. The results are calculated for Rb = 4, Hb = 2.0625, Hp = 3, and Sy = 4.

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Fig. 11

The distributions of film thickness and pressure along X-axis in the bumps column at different values of horizontal spacing: (a) Sx = 2, (b) Sx = 40, (c) Sx = 80, and (d) Sx = 120

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Fig. 12

The effect of dimensionless horizontal spacing, Sx, on the dimensionless average pressure, Pav, for various values of dimensionless vertical spacing, Sy

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Fig. 13

The three-dimensional dimensionless film pressure distributions for the different values of dimensionless vertical spacing: (a) Sy = 0 and (b) Sy = 4

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Fig. 15

The effect of dimensionless horizontal spacing, Sx, on the dimensionless average pressure, Pav, for various values of dimensionless bump height, Hb. The results are calculated for Rb = 4, Hp = 4, Sy = 4, and Nb = 5.

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Fig. 16

The effect of dimensionless horizontal spacing, Sx, on the dimensionless average pressure, Pav, for various values of dimensionless dimple depth, Hp. The results are calculated for Rb = 4, Hb = 4, Sy = 4, and Nb = 5.

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Fig. 14

The effect of dimensionless horizontal spacing, Sx, on the dimensionless average pressure, Pav, for various values of dimensionless donut-shaped bump radius, Rb

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