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"
}