Combined experimental and multiphase computational fluid dynamics analysis of surface textured journal bearings in mixed regime of lubrication

Abstract

This paper investigates the effect of surface texturing in a partial pad journal bearing through a series of controlled experiments at operating conditions, promoting mixed or boundary regimes of lubrication. Improvements to load carrying capacity are observed under certain operating conditions. A comprehensive À Á 2 ; Δ ij , Kronecker delta; ε, Eccentricity ratio; η, Lubricant dynamic viscosity; θ, Circumferential direction in bearing; λ, Stribeck oil film parameter; μ, Pressure coefficient for boundary shear strength of asperities or coefficient of friction; ν, Poisson ratio; ξ, Number of asperity peaks per unit contact area; ρ, Lubricant density; σ, Standard deviation of surface roughness; ς, Pressure coefficient for boundary shear strength of asperities; τ, Shear stress; τ 0 , Eyring shear stress; φ, Journal's attitude angle; ϕ 1,2 , Probability density function (PDF) of a surface height distribution; ϕ * , Convolution of PDF of counterface surfaces; ω, Angular velocity ------------------------------------------------------------------This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Effects of double parabolic profiles with groove textures on the hydrodynamic lubrication performance of journal bearing under steady operating conditions

“…Gu et al [16] presented a mixed lubrication model to analyze the performance of the journal bearing with groove textures operating from mixed to hydrodynamic lubrication regime, and the influences of fluid piezoviscosity and non-Newtonian behaviors are also taken into consideration. Morris et al [17] investigated the effects of textured surface in a partial pad journal bearing by experiments. Their results showed the effective load bearing region is extended due to micro-hydrodynamic effect, which can improve the load carrying capacity.…”

Combined Influence of Noncondensable Gas Mass Fraction and Mathematical Model on Cavitation Performance of Bearing

“…Fu et al [2] used the mass conserving cavitation model to simulate the cavitation regions, the results of the model are validated by the experimental data from the literature. Morris et al [3] showed that improved conditions with a textured journal, delaying the effect of lubricant rupture, thus extending the effective region of bearing load. Poddar et al [4] got a clearer picture of the film by filming the moment of the film, using vibration and sound technology to monitor the formation of cavitation.…”

Multiphase Computational Fluid Dynamics Analysis of Hydrodynamic Journal Bearing Under the Combined Influence of Texture and Slip

“…Starting from the pioneering study of Hamilton et al [1], the positive influences of surface texturing have been highlighted in lubricated contact. Recent experimental results in this area [2][3][4] revealed that significant amelioration in lubrication performance can be obtained by surface texturing. According to Morris et al [2], promoting the micro-hydrodynamic effect could delay the influence of lubricant rupture and consequently the effective load bearing region could be extended.…”

“…Recent experimental results in this area [2][3][4] revealed that significant amelioration in lubrication performance can be obtained by surface texturing. According to Morris et al [2], promoting the micro-hydrodynamic effect could delay the influence of lubricant rupture and consequently the effective load bearing region could be extended. By introducing the texture pattern on the whole of the bearing shell circumference, substantial friction reduction (approximately 18%) was achieved when compared to the smooth (untextured) reference as reported by Vlădescu et al [3].…”