Publication detail

Lubricant flow in thin-film elastohydrodynamic contact under extreme conditions

ŠPERKA, P. KŘUPKA, I. HARTL, M.

Czech title

Tok maziva v tenkých elastohydrodynamicky mazaných kontaktech za extrémních podmínek

English title

Lubricant flow in thin-film elastohydrodynamic contact under extreme conditions

Type

journal article in Web of Science

Language

en

Original abstract

To further extend knowledge about fluid film friction in elastohydrodynamic contact, it is important to examine how lubricant flows. In this paper, several film thickness results obtained by interferometry technique for different kinds of experiments were analyzed and discussed based on lubricant flow continuity. Results of two steady-state and two transient experiments are presented. Possible speed profiles that can explain observed film thickness distributions were suggested. It is shown that major part of present experiments can be explained by a single speed profile known as a plug flow. This finding is in contradiction to usual linear speed profile predicted by Reynolds equation.

Czech abstract

V článku je popsána interpretace výsledků měření rozložení tloušťky mazací vrstvy v bodových kontaktech z pohledu zachování kontinuity toku a členů Reynoldsovy rovnice pro specifické případy provozních podmínek. Prezentovány jsou experimentální výsledky dvou experimentů za ustálených podmínek a dvou experimentů za přechodových podmínek získané s použitím optické interferenční metody. Většina výsledků poukazuje na existenci plug-flow, který je v rozporu s běžnou teorií elastohydrodynamického mazaní.

English abstract

To further extend knowledge about fluid film friction in elastohydrodynamic contact, it is important to examine how lubricant flows. In this paper, several film thickness results obtained by interferometry technique for different kinds of experiments were analyzed and discussed based on lubricant flow continuity. Results of two steady-state and two transient experiments are presented. Possible speed profiles that can explain observed film thickness distributions were suggested. It is shown that major part of present experiments can be explained by a single speed profile known as a plug flow. This finding is in contradiction to usual linear speed profile predicted by Reynolds equation.

Keywords in Czech

kapalinové tření; rychlostní profil; zachování kontinuity toku; reologie maziva; plug-flow

Keywords in English

fluid film friction; speed profile; flow rate continuity; lubricant rheology; plug flow

Released

01.12.2016

Publisher

Tsinghua University Press

ISSN

2223-7690

Volume

4

Number

4

Pages from–to

380–390

Pages count

11

BIBTEX


@article{BUT134782,
  author="Petr {Šperka} and Ivan {Křupka} and Martin {Hartl},
  title="Lubricant flow in thin-film elastohydrodynamic contact under extreme conditions",
  year="2016",
  volume="4",
  number="4",
  month="December",
  pages="380--390",
  publisher="Tsinghua University Press",
  issn="2223-7690"
}