Detail publikace

Quantitative elastohydrodynamic film thickness of mechanically degraded oil

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

Anglický název

Quantitative elastohydrodynamic film thickness of mechanically degraded oil

Typ

Článek recenzovaný mimo WoS a Scopus

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.

Klíčová slova anglicky

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

Vydáno

2013-02-19

Nakladatel

Elsevier

Místo

EU

ISSN

0301-679X

Časopis

Tribology International

Ročník

65

Číslo

8

Strany od–do

33–38

Počet stran

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"
}