Publication detail

A comparison of measured film thicknesses with quantitative predictions from an elastohydrodynamic, perturbation analysis at high slide-roll ratios

HOOKE, CH. ŠPERKA, P. BAIR, S. MORALES-ESPEJEL, G.E.

English title

A comparison of measured film thicknesses with quantitative predictions from an elastohydrodynamic, perturbation analysis at high slide-roll ratios

Type

journal article in Web of Science

Language

en

Original abstract

The behaviour of elastohydrodynamic contacts at high slide-roll ratios (SRR) differs markedly from that found in rolling conjunctions and at low SRRs. Behaviour is dominated by viscosity reduction due to shear-thinning and by temperature rises in the fluid and mating surfaces. These have a major influence on both the performance of smooth contacts and the behaviour of rough surfaces. This paper presents a set of experimental results for these conditions where artificial roughness in the form of transverse ridges is present. These are then compared to the results of a perturbation analysis to see whether this rapid analysis technique can adequately predict the behaviour. It is shown that very powerful feedback mechanisms exist in both the thermal and shear thinning and that these make the behaviour of surface roughness relatively insensitive to changes in fluid properties. In contrast to most previous work, real temperature, pressure and shear dependences of viscosity as measured in viscometers have been employed.

English abstract

The behaviour of elastohydrodynamic contacts at high slide-roll ratios (SRR) differs markedly from that found in rolling conjunctions and at low SRRs. Behaviour is dominated by viscosity reduction due to shear-thinning and by temperature rises in the fluid and mating surfaces. These have a major influence on both the performance of smooth contacts and the behaviour of rough surfaces. This paper presents a set of experimental results for these conditions where artificial roughness in the form of transverse ridges is present. These are then compared to the results of a perturbation analysis to see whether this rapid analysis technique can adequately predict the behaviour. It is shown that very powerful feedback mechanisms exist in both the thermal and shear thinning and that these make the behaviour of surface roughness relatively insensitive to changes in fluid properties. In contrast to most previous work, real temperature, pressure and shear dependences of viscosity as measured in viscometers have been employed.

Keywords in English

Thermal EHL; shear thinning; surface roughness; perturbation analysis

Released

01.04.2021

Publisher

SAGE PUBLICATIONS LTD

Location

LONDON

ISSN

1350-6501

Volume

235

Number

4

Pages from–to

870–880

Pages count

11

BIBTEX


@article{BUT169792,
  author="Petr {Šperka},
  title="A comparison of measured film thicknesses with quantitative predictions from an elastohydrodynamic, perturbation analysis at high slide-roll ratios",
  year="2021",
  volume="235",
  number="4",
  month="April",
  pages="870--880",
  publisher="SAGE PUBLICATIONS LTD",
  address="LONDON",
  issn="1350-6501"
}