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Performance evaluation of a single pad Externally adjustable fluid film bearing

Shenoy, Satish B (2008) Performance evaluation of a single pad Externally adjustable fluid film bearing. Phd. Thesis thesis, Manipal Institute of Technology, MIT, Manipal.

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Abstract

The serious appreciation of hydrodynamics in lubrication started at the end of the 9th centurywhen Beauchamp Tower, an engineer, noticed that the oil was pressurized by meas yetunknown mechanism. Tower then measured the oil pressure and found that it couldseparate the sliding surfaces by a hydraulic force [1]. At the time of Beauchamp Tower's discovery Osbome Reynolds and other theoreticians were working on a hydrodynamictheory of lubrication. By a most fortunate coincidence, Tower's detailed data was available to provide experimental confirmation of hydrodynamic lubrication almostat the exact time when Reynolds needed it. The result of this was a theory of hydrodynamiclubrication published in the Proceedings of the Royal Society by Reynolds in 1886 [2]. Reynolds provided the first analytical proof that a viscous liquid can physically separate two sliding surfaces by hydrodynamic pressure resulting in low frictionand theoretically zero wear. Reynolds' theory explains the mechanism of lubrication through the generation of a viscousliquid film between the moving surfaces. The condition is that the surfaces must move, relatively to each other, with sufficient velocity to generate such a film. All hydrodynamiclubrication can be expressed mathematically in the form of an equation which was originally derived by Reynolds and is commonly known throughout the literatureas the 'Reynolds equation'. There are several ways of deriving this equation. It is a simplification of the Navier-Stokes momentum and continuity equation. It IS, however, more often derived by considering the equilibrium of an element of liquid ~ectedto viscous shear and applying the continuity of flow principle.re are two conditions for the occurrence of hydrodynamic lubrication: 1. Two surfaces must move relatively to each other with sufficient velocity for a load carrying lubricating film to be generated and,2. Surfaces must be inclined at some angle to each other, i.e. convergent wedge. There are two exceptions to this last rule: hydrodynamic pressure can be generated betweenparallel stepped surfaces or the surfaces can move towards each other.

Item Type: Thesis (Phd. Thesis)
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 06 Jan 2015 09:13
Last Modified: 06 Jan 2015 09:13
URI: http://eprints.manipal.edu/id/eprint/141415

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