Influence of Surface Roughness on Non-Newtonian Thermohydrostatic Performance of a Hole-Entry Hybrid Journal Bearing

[+] Author and Article Information
T. Nagaraju

 P.E.S. College of Engineering, Mandya 571 401, India

Satish C. Sharma, S. C. Jain

Department of Mechanical & Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India

J. Tribol 129(3), 595-602 (Mar 10, 2007) (8 pages) doi:10.1115/1.2736451 History: Received March 10, 2006; Revised March 10, 2007

A general solution scheme to account the surface roughness and the cross-film viscosity variation of lubricant due to its non-Newtonian behavior and rise in fluid-film temperature for the analysis of fluid-film bearings is presented. The combined influence of surface roughness, non-Newtonian behavior of lubricant, and thermal effects on the performance of a hole-entry hybrid journal bearing system has been investigated. The surface roughness, especially stationary roughness (i.e., rough bearing and smooth journal) with a transverse pattern was found to partially compensate for the loss in load-carrying capacity due to the thermal and/or non-Newtonian behavior of lubricant effects. It limits 18.86% loss in load-carrying capacity due to the thermal effect to only 1.6% and 33.99% loss due to the combined influence of non-Newtonian lubricant and thermal effect to 16.76%.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Hole–entry journal bearing system

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Figure 2

Bearing geometry and surface profile

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Figure 3

Load-carrying capacity versus eccentricity ratio

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Figure 4

Circumferential midfilm temperature distribution at axial midplane (β=0.0)

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Figure 5

Circumferential fluid-film pressure distribution at the axial midplane (β=0.0)

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Figure 6

Load-carrying capacity versus surface roughness parameter (Λ)

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Figure 7

Load-carrying capacity versus restrictor design parameter

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Figure 8

Percentage change in load-carrying capacity (%F¯o) of smooth and rough bearings due to (a) thermal effect and (b) thermal and non-Newtonian effect



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