Effect of texture location on performance characteristics of two-lobe hydrodynamic journal bearing under turbulent regime

2021 ◽  
Author(s):  
Jagjit Singh Maan ◽  
R.K. Awasthi
Keyword(s):  
Journal Bearing ◽  
Performance Characteristics ◽  
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 dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

2020 ◽  
Vol 234 (9) ◽  
pp. 1500-1513
Author(s):  
Niranjan Singh ◽  
RK Awasthi
Keyword(s):  
Reynolds Equation ◽  
Journal Bearing ◽  
Dynamic Performance ◽  
Performance Characteristics ◽  
Eccentricity Ratio ◽  
Bearing Surface ◽  
Surface Textures ◽  
Hydrodynamic Journal Bearing ◽  
Theoretical Results ◽  
Bearing System

This paper concerns with theoretical investigation to predict the influence of cylindrical textures on the static and dynamic performance characteristics of hydrodynamic journal bearing system and the performance is compared with smooth surface bearing. The Reynolds equation governing the fluid–film between the journal and the bearing surface is solved numerically with the assistance of finite element method and the performance characteristics are evaluated as a function of eccentricity ratio, dimple depth and its location. In this study, four journal bearing configurations viz: smooth (non-textured), full-textured, partially textured-I, and partially textured-II are considered for the evaluation of theoretical results. The simulated results indicate that the influence of surface textures is more significant when the textures were created in upstream zone of 126°–286° and dimple aspect ratio nearly 1.0.

Combined effects of turbulence and elastic deformation on the performance of a journal bearing lubricated with a couple stress fluid

2018 ◽  
Vol 232 (12) ◽  
pp. 1597-1603 ◽  
Author(s):  
Boualem Chetti
Keyword(s):  
Elastic Deformation ◽  
Couple Stress ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Numerical Study ◽  
Performance Characteristics ◽  
Couple Stress Fluid ◽  
Turbulent Regime ◽  
Load Carrying ◽  
Modified Reynolds Equation

This paper presents a numerical study of the effect of turbulence and elastic deformation on the performance of a journal bearing operating with couple stress fluids, following Constantinescu’s turbulent lubrication theory. The modified Reynolds equation is derived taking into consideration the effect of turbulence and couple stresses. The modified Reynolds equation is solved using finite difference method. The results in terms of the load-carrying capacity, the attitude angle, friction coefficient and the side leakage are reported for various values of the couple stress parameter, the elastic coefficient, and Reynolds number. According to the obtained results, the couple stress fluid improves the performance characteristics of the rigid and deformed journal bearing in laminar and turbulent regimes. The results also show that bearing deformation and the turbulent regime cannot be neglected in calculating the performance characteristics of journal bearings lubricated with a Newtonian and a couple stress fluid.

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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