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LIU, Y. WANG, Q.J.WANG, W. HU, Y., ZHU, D. KŘUPKA, I. HARTL, M.
Original Title
EHL simulation using the free-volume viscosity model
Type
journal article - other
Language
English
Original Abstract
The free-volume viscosity model can accurately predict the temperature pressure viscosity relationship of lubricants. However, it is seldom used in elastohydrodynamic lubrication (EHL) simulation. This paper presents the application of the free-volume viscosity model in a Newtonian EHL simulation of a squalane-lubricated circular contact. Good agreement is observed between available experimental data and simulation results. The pressure viscosity coefficients fit from viscometer data are also discussed. A recently developed definition of the coefficient is used to compare the coefficient value extracted from EHL film thickness interference measurements. Results indicate that the coefficient values from the curve fitting and EHL film thickness extraction agree well which has not been previously observed. Two factors help achieve this agreement: the new coefficient definition and smaller prediction error when using the Hamrock Dowson formula in the cases studied. The effects of different pressure viscosity relationships, including the exponential model, the Roelands model and the free volume model, are investigated through an example with bright stock mineral oil. It is found that the real pressure viscosity behavior predicted by the free volume model yields a higher viscosity at the low pressure area which results in a larger central film thickness. Therefore, due to use of the free-volume model, the present results are more consistent with experimental observations than previously reported numerical results.
Keywords
lubrication; film thickness
Authors
LIU, Y.; WANG, Q.J.;WANG, W.; HU, Y.,; ZHU, D.; KŘUPKA, I.; HARTL, M.
RIV year
2006
Released
15. 7. 2006
Publisher
Springer Netherlands
Location
Holandsko
ISBN
1023-8883
Periodical
Tribology Letters
Year of study
23
Number
1
State
United States of America
Pages from
27
Pages to
37
Pages count
11
BibTex
@article{BUT43714, author="Ivan {Křupka} and Martin {Hartl}", title="EHL simulation using the free-volume viscosity model", journal="Tribology Letters", year="2006", volume="23", number="1", pages="27--37", issn="1023-8883" }