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In-situ ultrasonic viscometry of lubricants under temperature and shear.
- Source :
-
Tribology International . Mar2024, Vol. 191, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Understanding the behaviour of engine and gear oils, especially the viscosity, under temperature and shear is important to improve machine operation. A novel viscometer using ultrasound is presented and used under a range of temperatures. A single cross-temperature (between 20 ° C and 60 ° C) ultrasonic calibration is shown to be sufficient. Next, the ultrasonic viscometer is compared to a conventional viscosity measurement technique for Newtonian and non-Newtonian lubricants. Newtonian viscosity standard fluids and shear-thinning engine oils are studied. Both viscosity measurement techniques match for Newtonian fluids but ultrasonic measurements are consistently lower for shear-thinning fluids. It suggests that the ultrasonic viscometer is similar to a high-shear viscometer with a shear rate of about 1 0 6 s − 1 . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0301679X
- Volume :
- 191
- Database :
- Academic Search Index
- Journal :
- Tribology International
- Publication Type :
- Academic Journal
- Accession number :
- 174689470
- Full Text :
- https://doi.org/10.1016/j.triboint.2023.109210