Viscoelastic effects on the stability of thin-film parallel flow in lubrication applications

Document Type

Conference Proceeding

Publication Date

1-1-2000

Abstract

The analysis is concerned with the effect of fluid-elasticity on the stability of laminar parallel flow. The widely used multi-grade oils contain polymer additives that make them viscoelastic. These oils are widely used for high shear-rate laminar flow of hydrodynamic lubrication, where flow instability is undesirable because it significantly increases the viscous friction losses. A fluid model is applied where the stress-relaxation effect is considered in addition to the fluid viscosity. However, the normal stresses are disregarded. Extended Orr-Sommerfeld type analysis has been performed for elastic fluid films of lubrication. The conclusion is that the elasticity of the fluid has a destabilizing effect. For parallel flow, the transition to instability is at lower Reynolds number in comparison to Newtonian fluids.

Identifier

85119865603 (Scopus)

ISBN

[9780791819180]

Publication Title

ASME International Mechanical Engineering Congress and Exposition Proceedings Imece

External Full Text Location

https://doi.org/10.1115/IMECE2000-2707

First Page

49

Last Page

54

Volume

2000-AP

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