NDLI: Comparison of Non-Newtonian Constitutive Laws in Hydrodynamic Lubrication

Content Provider	Springer Nature Link
Author	Boucherit, Hamid Lahmar, Mustapha Bou Saïd, Benyebka Tichy, John
Copyright Year	2010
Abstract	Present day commercial lubricants incorporate a range of additives of long-chain polymers. Such polymers are called Viscosity Index improvers and were originally introduced to limit the decrease of viscosity with temperature. However, in addition, these polymers cause the oil to exhibit non-Newtonian behavior. The most common, and probably the most important, non-Newtonian effect is the reduction of viscosity with shear rate, so-called shear thinning. In rheological terms this is called generalized Newtonian (purely viscous) behavior. In this study, several ‘true’ non-Newtonian models (as opposed to generalized Newtonian) are compared. There is some experimental evidence that such non-Newtonian effects are favorable to lubrication. The models studied include time-dependent effects—a linear and nonlinear viscoelastic Maxwell model; and they include the effect of particles within the fluid—the Finitely Extensible Nonlinear Elastic (FENE) dumbbell model, and the Stokes couple stress model. The Maxwell and FENE models show a small decrease in load capacity, while the Stokes model shows a significant increase.
Starting Page	49
Ending Page	57
Page Count	9
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	40
Issue Number	1
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2010-03-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lubrication Hydrodynamic Rheology Non-Newtonian Nanotechnology Physical Chemistry Theoretical and Applied Mechanics Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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