Abstract
The steady state performance analysis of short circular journal bearing is conducted using the viscosity correction model under thin film lubrication conditions. The thickness of adsorbed molecular layers is the most critical factor in studying thin film lubrication, and is the most essential parameter that distinguishes thin film from thick film lubrication analysis. The interaction between the lubricant and the surface within a very narrow gap has been considered. The general Reynolds equation has been derived for calculating thin film lubrication parameters affecting the performance of short circular journal bearing. Investigation for the load carrying capacity, friction force, torque, and power loss for the short circular journal bearing under the consideration of adsorbed layer thickness (2δ) has been carried out. The analysis is carried out for the short bearing approximation (L/D=0.5) using Gumbel’s boundary condition. It has been found that the steady state performance parameters are comparatively higher for short circular journal bearing under the consideration of adsorbed layer thickness than for plain circular journal bearing. The load carrying capability of adsorbed layer thickness considered bearing is observed to be high for the specified operating conditions. This work could promote the understanding and research for the mechanism of the nanoscale thin film lubrication.
Highlights
During the past few decades hydrodynamic journal bearings have received great attention from practical and analytical engineers
The rapid growth of journal bearing technology is mainly due to its wide range of engineering applications such as precision machine tools, high speed aircraft, nuclear reactors, and textile spindles
The influence of the adsorbed layer thickness in the thin film lubrication to the lubricant viscosity is considered here, and assuming that two surfaces have the same adsorption characteristics (δ1 = δ2), the equivalent viscosity correction model is introduced in the analysis of plain circular journal bearing
Summary
During the past few decades hydrodynamic journal bearings have received great attention from practical and analytical engineers. An important technical specification of a lubricant, is an important parameter for fluid lubrication analysis. When performing the analysis for a general bearing with fluid lubrication, the viscosity is usually kept constant [2]. One key feature of lubricant is its viscosity distribution in the bearing. Investigation of steady state behavior of a short journal bearing under thin film lubrication condition is necessary. This paper describes the behavior of a plain circular profiled journal bearing under the thin lubrication regime. In this paper the short circular journal bearing has been analyzed analytically taking consideration of the effect of adsorbed layer thickness (2δ) on the various performance parameters at steady state condition
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