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Influence of non‐Newtonian behavior of lubricant on performance of hole‐entry hybrid journal bearings employing constant flow valve restrictors

Influence of non‐Newtonian behavior of lubricant on performance of hole‐entry hybrid journal... Purpose – This paper aims to describe the theoretical study concerning the effect of non‐linear behavior of the lubricant on the performance of symmetric constant flow valve compensated hole‐entry hybrid journal bearing. The bearing performance characteristics have been computed for various values of non‐linearity factor, land width ratio, aspect ratio and external load. Design/methodology/approach – The analysis considers the generalized Reynolds equation governing the flow of lubricant having variable viscosity in the clearance space and equation of flow of lubricant through constant flow valve restrictor. The non‐Newtonian lubricant is assumed to follow the cubic shear stress law. Findings – The study indicates that for generation of accurate bearing characteristics data, the inclusion of non‐linear effects of lubricant in the analysis is essential. Originality/value – The performance characteristics in terms of minimum fluid‐film thickness, fluid‐film stiffness and damping coefficients, critical mass and threshold speed for a wide range of values of the non‐linearity factor and external load are presented. The results presented are expected to be quite useful to bearing designers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

Influence of non‐Newtonian behavior of lubricant on performance of hole‐entry hybrid journal bearings employing constant flow valve restrictors

Industrial Lubrication and Tribology , Volume 63 (5): 14 – Aug 16, 2011

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References (21)

Publisher
Emerald Publishing
Copyright
Copyright © 2011 Emerald Group Publishing Limited. All rights reserved.
ISSN
0036-8792
DOI
10.1108/00368791111154995
Publisher site
See Article on Publisher Site

Abstract

Purpose – This paper aims to describe the theoretical study concerning the effect of non‐linear behavior of the lubricant on the performance of symmetric constant flow valve compensated hole‐entry hybrid journal bearing. The bearing performance characteristics have been computed for various values of non‐linearity factor, land width ratio, aspect ratio and external load. Design/methodology/approach – The analysis considers the generalized Reynolds equation governing the flow of lubricant having variable viscosity in the clearance space and equation of flow of lubricant through constant flow valve restrictor. The non‐Newtonian lubricant is assumed to follow the cubic shear stress law. Findings – The study indicates that for generation of accurate bearing characteristics data, the inclusion of non‐linear effects of lubricant in the analysis is essential. Originality/value – The performance characteristics in terms of minimum fluid‐film thickness, fluid‐film stiffness and damping coefficients, critical mass and threshold speed for a wide range of values of the non‐linearity factor and external load are presented. The results presented are expected to be quite useful to bearing designers.

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Aug 16, 2011

Keywords: Constant flow valve restrictor; Hybrid journal bearing; Non‐Newtonian; Bearings; Lubrication; Data analysis

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