Double-Layered Porous Rayleigh Step Slider Bearings Lubricated with Couplestress Fluids

Naduvinamani, N. B.; Ganachari, Rakesh

doi:10.17485/ijst/v15i28.33

Cited by 5 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effects of the Hartmann number as well as couple-stress parameter improve the frictional force, load capacity, and coefficient of friction as observed by Hiremath et al [11]. The two layered porous step slider bearings, developed by Naduvinamani and Ganachari [12], have a work load of higher level and with a capacity to wear of a lower level than single layered porous bearings. Rahmani et al [13] were able to optimize the load capacity, force developed through interaction of surface, friction coefficient, and flow rate of lubricant of a Rayleigh step bearing.…”

Section: Introductionmentioning

confidence: 84%

Effect of MHD and Surface Roughness on Porous Step-Slider Bearing Lubricated with Couple-Stress Fluid

Anthony¹,

Elamparithi²

2023

IJHT

View full text Add to dashboard Cite

To examine the performance of the rough-porous Rayleigh step slider bearing lubricated with couple stress fluid considering the effect of MHD forms the crux of this article. The bearing surface roughness is assumed to be longitudinal as well as transversal. The expression for longitudinal and transversal roughness are derived by using the stochastic random variable. The modified Darcy's law is used to derive the pressure in the porous region, The space between the slider filled with couple stress fluid. The stochastic Reynolds equation is derived applying the Christensen's stochastic approach. Following this the expression for load carrying capacity, fictional force and coefficient of friction are derived. It is observed that work load and frictional force increases when compared with plate without roughness and porous and decreases for coefficient of friction.

show abstract

Section: Introductionmentioning

confidence: 84%

Effect of MHD and Surface Roughness on Porous Step-Slider Bearing Lubricated with Couple-Stress Fluid

Anthony¹,

Elamparithi²

2023

IJHT

View full text Add to dashboard Cite

show abstract

“…When mechanical operation is under harsh conditions, the oil will transform into a non-Newtonian fluid due to factors such as temperature, and its viscosity will change with the applied shear force or strain rate [28]. Currently, many studies have shown that non-Newtonian fluid lubricants can effectively improve oil film bearing capacity and reduce contact friction [29][30][31]. Zhu et al [32] developed a comprehensive Reynolds equation for rough journal bearing under pseudoplastic lubricant flow.…”

Section: Introductionmentioning

confidence: 99%

Study on the mixed lubrication of rough planar extrusion considering surface texture

Su,

Shao,

Tang

et al. 2024

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

Surface texture plays a crucial role in fluid dynamic lubrication. The non-Newtonian thermal elastohydrodynamic lubrication problem involving rough surfaces with texture has not been investigated to date. In this paper, a model for non-Newtonian thermal elastohydrodynamic lubrication incorporating rough surfaces and texture morphology is developed, focusing on the problem of mixed lubrication in planar extrusion with texture. The model builds upon the Reynolds equation with flow factor introduced. It considers the effects of rough surface texture, thermal effects, and non-Newtonian effects. The Reynolds equation is numerically solved using the Semi-System method to calculate the oil film pressure in full film region and contact pressure in dry contact area. The DC-FFT algorithm is employed to calculate surface elastic deformation. Comparing the calculated friction coefficient of the present model with the measured values in literature experiments, the average error is only 6.94%. Furthermore, the study investigates the effects of texture, temperature, and non-Newtonian on interfacial lubrication performance under mixed lubrication conditions. It’s found that compared to untextured surface, the average film thickness of textured surface increased by a maximum of 10.8%, and the friction coefficient decreased by a maximum of 67.4%; Compared to Newtonian fluids, shear thinning fluids reduce temperature by 0.18%, and shear thickening fluids are more conducive to improving mixed lubrication performance. A stepped pit texture is designed based on the dynamic pressure mechanism of the texture, indicating that the circular stepped pit texture has the best load-bearing capacity improvement.

show abstract

“…Similarly, Srinivasan's [17] investigation revealed that the double layer had the effect of augmenting load capacity and frictional drag while simultaneously decreasing the coefficient of friction. Comparing single and double layer porous step slider bearing with couple stress fluid, Naduvinamani and Ganachari [18] found the double porous layer to possess a superior load carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Double Porous Layer on Rough Step Slider Bearing Lubricated with Couple Stress Fluid

Anthony,

Elamparithi

2023

MMEP

View full text Add to dashboard Cite

An investigation into how a double porous layer at the base impacts the performance of a Rayleigh step slider bearing lubricated with couple stress fluid is presented. The bearing is considered to be rough in nature. The modified Darcy's law is used to express the fluid pressure in the porous regions. To estimate the effect of surface roughness of the bearing the random variables pertaining to roughness parameters are analysed applying the Christen'S stochastic model. Applying Stokes' micro-continuum theory for couple stress yields an estimation of pressure via a modified Reynolds equation. Integrating over the bearing length the estimated film pressure, the load carrying capacity or lifting force, frictional force and coefficient of friction are incorporated into the study. A comparison to a single porous layer underscores the superior efficiency offered by the double porous layer. The study further elucidates the most favourable inlet film height and the optimal bearing length that facilitate maximum load carrying capacity. It is evident that the inlet film thickness can be reached the maximum up to 1.8 to 2 to obtain the maximum load carrying capacity of the bearing. The present study is compared with the existent results and that is more efficient for the current bearing model.

show abstract

Double-Layered Porous Rayleigh Step Slider Bearings Lubricated with Couplestress Fluids

Cited by 5 publications

References 20 publications

Effect of MHD and Surface Roughness on Porous Step-Slider Bearing Lubricated with Couple-Stress Fluid

Effect of MHD and Surface Roughness on Porous Step-Slider Bearing Lubricated with Couple-Stress Fluid

Study on the mixed lubrication of rough planar extrusion considering surface texture

Effect of Double Porous Layer on Rough Step Slider Bearing Lubricated with Couple Stress Fluid

Contact Info

Product

Resources

About