scholarly journals Influence of Surface Texture on the Performance of Hydrodynamic Journal Bearing Operating under Turbulent Regime

2021 ◽  
Vol 16 (2) ◽  
pp. 99-112
Author(s):  
RK Awasthi ◽  
Jagjit Singh Maan
Keyword(s):  
Surface Texture ◽  
Journal Bearing ◽  
Turbulent Regime ◽  
Hydrodynamic Journal Bearing

Investigation the combined effects of wear and turbulent on the performance of hydrodynamic journal bearing operating with couple stress fluids

2019 ◽  
Vol 10 (6) ◽  
pp. 825-837
Author(s):  
Mushrek A. Mahdi ◽  
Ahmed Waleed Hussein
Keyword(s):  
Couple Stress ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Performance Characteristics ◽  
Turbulent Regime ◽  
Hydrodynamic Bearings ◽  
Content Type ◽  
Hydrodynamic Journal Bearing ◽  
Local Reynolds Number ◽  
Couple Stress Fluids

Purpose The purpose of this paper is to investigate the combined effect of wear and turbulence on the performance of a hydrodynamic journal bearing operating under Newtonian and couple stress fluids (CSF). Design/methodology/approach The analysis consists of a modified Reynolds equation of incompressible thin viscous films, and the film thickness model taking into account the wear effect. The governing equation was solved numerically using the finite difference approach. Findings The effect of both the wear parameter and the local Reynolds number on the performance characteristics of bearing has been presented and discussed. The obtained results observed that the characteristics of the intact and worn bearing in turbulent and laminar have been enhanced due to the non-Newtonian fluid (CSF) effect. Also, the results display that bearing worn and the turbulent regime cannot be neglected in calculating the performance characteristics of the bearing lubricated with Newtonian and non-Newtonian fluids. The results achieved from this study, specify that the bearing characteristics are significantly affected by these effects. Originality/value The paper investigates the behavior of hydrodynamic bearings considering different aspects simultaneously is interesting, and the application meets the current needs of improvement in modeling hydrodynamic bearings under different conditions.

Influence of Surface Texture on Lubrication Performance of Hydrodynamic Journal Bearing

2011 ◽  
Vol 120 ◽  
pp. 426-431 ◽  
Author(s):  
Su Hua Wang ◽  
Xin Yue Wu ◽  
Jian Hua Zheng
Keyword(s):  
Friction Coefficient ◽  
Surface Texture ◽  
Journal Bearing ◽  
Axial Direction ◽  
Diameter Ratio ◽  
Small Width ◽  
Lubrication Performance ◽  
Load Carrying ◽  
Hydrodynamic Journal Bearing ◽  
Inlet Zone

A finite-difference numerical model is used to study the influence of surface texture on lubrication performance of hydrodynamic journal bearing. Reynolds equation is adopted to calculate the bearing load carrying capacity, friction force and friction coefficient under different width-diameter ratio, different eccentricity ratio and different texture location. Results show that partial texture along the circumferential direction on the bearing with small width-diameter ratio will increase bearing performance appreciably. Partial texture along the axial direction will decrease friction coefficient effectively, especially at the film inlet zone or the position of film pressure trending to zero.

Enhancement of steady state performance of hydrodynamic journal bearing using chevron-shaped surface texture

2019 ◽  
Vol 233 (12) ◽  
pp. 1833-1843 ◽  
Author(s):  
Sanjay Sharma ◽  
Gourav Jamwal ◽  
Rajeev K Awasthi
Keyword(s):  
Steady State ◽  
Surface Texture ◽  
Journal Bearing ◽  
Performance Enhancement ◽  
Surface Texturing ◽  
Design Parameters ◽  
Enhancement Ratio ◽  
Shaped Surface ◽  
Hydrodynamic Journal Bearing ◽  
Steady State Performance

In the present study, the optimum design parameters of chevron-shaped surface texture have been determined for the steady state performance enhancement of a hydrodynamic journal bearing. The fluid flow governing Reynolds equation has been solved using the finite element method, assuming iso-viscous and Newtonian fluid to obtain the static performance characteristics of textured hydrodynamic journal bearing. Different texture depths, areas and distributions have been numerically simulated and a set of optimum texture parameters has been determined based on the maximum performance enhancement ratio. The numerically obtained results indicate that surface texturing can improve bearing performance if the textured region is placed in the pressure build-up region. Moreover, surface texturing is the most effective at bearing performance enhancement when the bearing operates at lower eccentricity ratios. The performance enhancement ratio, which is the ratio of load-carrying capacity to coefficient of friction is found to be maximum at texture depth of 0.4, k = 0.3, textured zone located in the increasing pressure region and eccentricity ratio of 0.2.

Static and dynamic analysis of hydrodynamic journal bearing operating under nano lubricants

2009 ◽  
Vol 2 (1/2/3/4/5/6) ◽  
pp. 251 ◽  
Author(s):  
K. Prabhakaran Nair ◽  
Mohammed Shabbir Ahmed ◽  
Saed Thamer Al qahtani
Keyword(s):  
Dynamic Analysis ◽  
Journal Bearing ◽  
Static And Dynamic Analysis ◽  
Hydrodynamic Journal Bearing
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