Detail publikace
Kvantitativní tloušťka elastohydrodynamického mazacího filmu u mechanicky degradovaných olejů
BAIR, S. ŠPERKA, P. KŘUPKA, I. HARTL, M.
Český název
Kvantitativní tloušťka elastohydrodynamického mazacího filmu u mechanicky degradovaných olejů
Anglický název
Quantitative elastohydrodynamic film thickness of mechanically degraded oil
Typ
článek v časopise - ostatní, Jost
Jazyk
en
Originální abstrakt
The low-shear viscosities of new oil and used (degraded) oil were measured to moderately high pressure. Shear-thinning flow curves were generated over a range of shear stress important to EHL film forming. Mechanical shear degradation only affected the viscosity at low shear stress while the viscosity at high stress remained unchanged. A recently published film thickness equation for double-Newtonian shear-thinning, employing the measured rheology, predicts the surprising result that thickness of the EHL film was not changed by the degradation although the low-shear viscosities were reduced substantially. Colorimetric measurements of the film thicknesses validate the predictions. Concern over the permanent loss in viscosity due to degradation may be misplaced when addressing EHL films.
Český abstrakt
Článek shrnuje srovnání vypočítaných a naměřených hodnot tloušťky mazacího filmu v kontaltu u mechanicky degradovaných olejů. V článku je ukázána možnost dostatečně přesné predikce na základě realistických reologických modelů.
Anglický abstrakt
The low-shear viscosities of new oil and used (degraded) oil were measured to moderately high pressure. Shear-thinning flow curves were generated over a range of shear stress important to EHL film forming. Mechanical shear degradation only affected the viscosity at low shear stress while the viscosity at high stress remained unchanged. A recently published film thickness equation for double-Newtonian shear-thinning, employing the measured rheology, predicts the surprising result that thickness of the EHL film was not changed by the degradation although the low-shear viscosities were reduced substantially. Colorimetric measurements of the film thicknesses validate the predictions. Concern over the permanent loss in viscosity due to degradation may be misplaced when addressing EHL films.
Klíčová slova česky
zlepšovač viskozity; vysokotlaká reologie; tloušťka EHD filmu; mechanická smyková degradace
Klíčová slova anglicky
Viscosity modifier; High pressure rheology; EHL film thickness; Mechanical shear degradation
Rok RIV
2013
Vydáno
19.02.2013
Nakladatel
Elsevier
Místo
EU
ISSN
0301-679X
Ročník
65
Číslo
8
Strany od–do
33–38
Počet stran
6
BIBTEX
@article{BUT103166,
author="Petr {Šperka} and Ivan {Křupka} and Martin {Hartl},
title="Quantitative elastohydrodynamic film thickness of mechanically degraded oil",
year="2013",
volume="65",
number="8",
month="February",
pages="33--38",
publisher="Elsevier",
address="EU",
issn="0301-679X"
}