Detail publikačního výsledku

Quantitative elastohydrodynamic film thickness of mechanically degraded oil

BAIR, S.; ŠPERKA, P.; KŘUPKA, I.; HARTL, M.

Originální název

Quantitative elastohydrodynamic film thickness of mechanically degraded oil

Anglický název

Quantitative elastohydrodynamic film thickness of mechanically degraded oil

Druh

Článek recenzovaný mimo WoS a Scopus

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.

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

Viscosity modifier; High pressure rheology; EHL film thickness; Mechanical shear degradation

Klíčová slova v angličtině

Viscosity modifier; High pressure rheology; EHL film thickness; Mechanical shear degradation

Autoři

BAIR, S.; ŠPERKA, P.; KŘUPKA, I.; HARTL, M.

Rok RIV

2014

Vydáno

19.02.2013

Nakladatel

Elsevier

Místo

EU

ISSN

0301-679X

Periodikum

Tribology International

Svazek

65

Číslo

8

Stát

Spojené království Velké Británie a Severního Irska

Strany od

33

Strany do

38

Strany počet

6

BibTex

@article{BUT103166,
  author="BAIR, S. and ŠPERKA, P. and KŘUPKA, I. and HARTL, M.",
  title="Quantitative elastohydrodynamic film thickness of mechanically degraded oil",
  journal="Tribology International",
  year="2013",
  volume="65",
  number="8",
  pages="33--38",
  issn="0301-679X"
}