Detail publikace
Liquid superlubricity of lubricants containing hydroxyl groups and their aqueous solution under rolling/sliding conditions
POLÁČEK, T. ŠPERKA, P. KŘUPKA, I.
Anglický název
Liquid superlubricity of lubricants containing hydroxyl groups and their aqueous solution under rolling/sliding conditions
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
Macroscale rolling/sliding conditions are in the superlubricity, a little-studied topic so far. The purpose of this paper is to examine the formation of elastohydrodynamic lubrication (EHL) films by water-based lubricants (glycerol and polyethylene glycol (PEG)), providing superlubricous friction. Experiments were carried out on an optical ball-on-disc tribometer under rolling/sliding conditions. The film thickness was measured by the thin film colorimetric interferometry, and the viscosity of liquids was measured by rotational and high-pressure falling body viscometers. The results show that tribochemical reactions are not the mandatory reason for friction to reach the superlubricity level when using the water-based lubricants. The studied liquids themselves are almost Newtonian. With the addition of water, the signs of shear thinning behavior disappear even more. Suitable conditions for this type of lubricant can be predicted using the known Hamrock-Dowson equations. An anomaly in the thickness of the lubricants was observed as an abrupt change at certain conditions. The more PEG there is in the lubricant, the higher the thickness at the beginning of the jump.
Anglický abstrakt
Macroscale rolling/sliding conditions are in the superlubricity, a little-studied topic so far. The purpose of this paper is to examine the formation of elastohydrodynamic lubrication (EHL) films by water-based lubricants (glycerol and polyethylene glycol (PEG)), providing superlubricous friction. Experiments were carried out on an optical ball-on-disc tribometer under rolling/sliding conditions. The film thickness was measured by the thin film colorimetric interferometry, and the viscosity of liquids was measured by rotational and high-pressure falling body viscometers. The results show that tribochemical reactions are not the mandatory reason for friction to reach the superlubricity level when using the water-based lubricants. The studied liquids themselves are almost Newtonian. With the addition of water, the signs of shear thinning behavior disappear even more. Suitable conditions for this type of lubricant can be predicted using the known Hamrock-Dowson equations. An anomaly in the thickness of the lubricants was observed as an abrupt change at certain conditions. The more PEG there is in the lubricant, the higher the thickness at the beginning of the jump.
Klíčová slova anglicky
macroscale superlubricity; super low traction; water-based lubricants; elastohydrodynamic lubrication (EHL); film thickness
Vydáno
28.07.2023
Nakladatel
TSINGHUA UNIV PRESS
Místo
BEIJING
ISSN
2223-7704
Ročník
12
Číslo
1
Strany od–do
164–173
Počet stran
10
BIBTEX
@article{BUT185046,
author="Tomáš {Poláček} and Petr {Šperka} and Ivan {Křupka},
title="Liquid superlubricity of lubricants containing hydroxyl groups and their aqueous solution under rolling/sliding conditions",
year="2023",
volume="12",
number="1",
month="July",
pages="164--173",
publisher="TSINGHUA UNIV PRESS",
address="BEIJING",
issn="2223-7704"
}