Detail publikace
Utváření mazacích filmů u nenewtonovských maziv
LIU, Y. WANG, G.J. KŘUPKA, I. HARTL, M. BAIR, S.
Český název
Utváření mazacích filmů u nenewtonovských maziv
Anglický název
The Shear-Thinning Elastohydrodynamic Film Thickness of a Two-Component Mixture
Typ
článek v časopise - ostatní, Jost
Jazyk
en
Originální abstrakt
Lubricant base oils are often blends of different molecular weight cuts to arrive at a specified ambient pressure viscosity and, to improve the temperature-viscosity behavior or to simply increase the viscosity, viscosity-modifying polymer additives are often added to the base oil. This paper investigates the effect of mixture rheology on EHL film thickness using EHL contact measurements and a full numerical analysis for three synthetic lubricants including two single-component lubricants PAO650, and PAO100 and a mixture of these. The pressure and shear dependences of the viscosity of these lubricants were measured with high-pressure viscometers; viscosities were not adjusted to fit experiment. The point contact film thicknesses for these lubricants in pure rolling were measured using a thin-film colorimetric interferometry apparatus. Numerical simulations based on the measured rheology show very good agreement with the measurements of film thickness while the Newtonian prediction is up to twice the measurement. These results validate the use of realistic shear-thinning and pressure-viscosity models which originate from viscosity measurements. It is conceivable that simulation may provide a means to "engineer" lubricants with the optimum balance of film-thickness and friction though intelligent mixing of components.
Český abstrakt
Článek shrnuje výsledky teoretického řešení a experimentálního studia problematiky utváření mazacích filmů při užití nenewtonovských maziv.
Anglický abstrakt
Lubricant base oils are often blends of different molecular weight cuts to arrive at a specified ambient pressure viscosity and, to improve the temperature-viscosity behavior or to simply increase the viscosity, viscosity-modifying polymer additives are often added to the base oil. This paper investigates the effect of mixture rheology on EHL film thickness using EHL contact measurements and a full numerical analysis for three synthetic lubricants including two single-component lubricants PAO650, and PAO100 and a mixture of these. The pressure and shear dependences of the viscosity of these lubricants were measured with high-pressure viscometers; viscosities were not adjusted to fit experiment. The point contact film thicknesses for these lubricants in pure rolling were measured using a thin-film colorimetric interferometry apparatus. Numerical simulations based on the measured rheology show very good agreement with the measurements of film thickness while the Newtonian prediction is up to twice the measurement. These results validate the use of realistic shear-thinning and pressure-viscosity models which originate from viscosity measurements. It is conceivable that simulation may provide a means to "engineer" lubricants with the optimum balance of film-thickness and friction though intelligent mixing of components.
Klíčová slova česky
EHL; reologie; tloušťka mazacího filmu
Klíčová slova anglicky
EHL; elastohydrodynamics; rheology; film thickness; shear-thinning; non-Newtonian; viscosity
Rok RIV
2008
Vydáno
17.04.2008
Nakladatel
ASME
Místo
USA
ISSN
0742-4787
Časopis
ASME Transaction, Journal of Tribology
Ročník
130
Číslo
2
Strany od–do
021502-1–021502-7
Počet stran
7
BIBTEX
@article{BUT44742,
author="Ivan {Křupka} and Martin {Hartl},
title="The Shear-Thinning Elastohydrodynamic Film Thickness of a Two-Component Mixture",
journal="ASME Transaction, Journal of Tribology",
year="2008",
volume="130",
number="2",
month="April",
pages="021502-1--021502-7",
publisher="ASME ",
address="USA",
issn="0742-4787"
}