Surface roughness effect on couple stress fluid lubricated Porous pivoted slider bearings

This paper presents the theoretical study and analyzes the comparison of porous structures on the performance of a couple stress fluid based on rough slider bearing. The globular sphere model of Kozeny-Carman and Irmay’s capillary fissures model have been subjected to investigations. A more general form of surface roughness is mathematically modeled by a stochastic random variable with non-zero mean, variance and skewness. The stochastically averaged Reynolds type equation has been solved under suitable boundary conditions to obtain the pressure distribution in turn which gives the expression for the load carrying capacity, frictional force and coefficient of friction. The results are illustrated by graphical representations which show that the introduction of combined porous structure with couple stress fluid results in an enhanced load carrying capacity more in the case of Kozeny-Carman model as compared to Irmay’s model.

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Porous exponential slider bearings lubricated with MHD-couple stress fluid

Industrial Lubrication and Tribology ◽

10.1108/ilt-03-2017-0057 ◽

2018 ◽

Vol 70 (5) ◽

pp. 838-845 ◽

Cited By ~ 4

Author(s):

N.B. Naduvinamani ◽

Shridevi S. Hosmani

Keyword(s):

Couple Stress ◽

Numerical Solutions ◽

Transverse Magnetic ◽

Operating Conditions ◽

Couple Stress Fluid ◽

Content Type ◽

Electrically Conducting ◽

Slider Bearings ◽

Load Carrying ◽

First Time

Purpose The purpose of this study is to examine the magneto-hydrodynamic (MHD) effect on porous exponential slider bearings lubricated with couple stress fluid and to derive the modified Reynolds’s equation for non-Newtonian fluid under various operating conditions to obtain the optimum bearing parameters. Design/methodology/approach Based upon the MHD theory and Stokes theory for couple stress fluid, the governing equations relevant to the problem under consideration are derived. This paper analyzes the effect on porous exponential slider bearings with an electrically conducting fluid in the presence of a transverse magnetic field. Semi-numerical solutions are obtained and discussed. Findings It is found that there is an increase in the load carrying capacity, frictional force and decrease in the co-efficient of friction in porous bearings due to the presence of magnetic effects with couple stress fluid. Originality/value This study is relatively original and gives the MHD effect on porous exponential slider bearings lubricated with couple stress fluid. The author believes that the paper presents these results for the first time.

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Investigation of Couple Stress Fluid and Surface Roughness Effects in the Elastohydrodynamic Lubrication Problems using Wavelet-Based Decoupled Method

Lubricants ◽

10.3390/lubricants4010009 ◽

2016 ◽

Vol 4 (1) ◽

pp. 9

Author(s):

Siddu Shiralashetti ◽

Mounesha Kantli

Keyword(s):

Surface Roughness ◽

Couple Stress ◽

Elastohydrodynamic Lubrication ◽

Couple Stress Fluid ◽

Roughness Effects ◽

Decoupled Method

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Squeeze film behavior in porous transversely circular stepped plates with a couple stress fluid

Engineering Computations ◽

10.1108/ec-12-2014-0260 ◽

2016 ◽

Vol 33 (2) ◽

Cited By ~ 1

Author(s):

Santhana Krishnan Narayanan ◽

A Chamkha ◽

Sundarammal Kesavan

Keyword(s):

Surface Roughness ◽

Couple Stress ◽

Design Methodology ◽

Reynolds Equation ◽

Closed Form Solution ◽

Stochastic Theory ◽

Classical Case ◽

Form Solution ◽

Couple Stress Fluid ◽

Squeeze Film

Purpose The purpose of this work is to carry our a study of the effect of surface roughness on squeeze film behavior between two transversely circular stepped plates with couple stress lubricant when the upper circular stepped plate has porous facing which approaches the lower plate with uniform velocity. Design/methodology/approach The modified Stochastic Reynolds equation is derived for Christensen Stochastic theory for the rough surfaces. Closed form solution of the Stochastic Reynolds equation is obtained in terms of Fourier-Bessel series. Findings It is found that the effect of couple stress fluid and surface roughness is more pronounced compared to classical case. Originality/value The problem is original that it consider a couple stress fluid in this type of applications.

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