Peretti, G. orcid.org/0009-0004-3913-5508, Bouscharain, N., Dörr, N. et al. (2 more authors) (2024) In-situ ultrasonic viscometry of lubricants under temperature and shear. Tribology International, 191. 109210. ISSN 0301-679X
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 106 s−1.
Metadata
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Copyright, Publisher and Additional Information: | © 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). | ||||||
Keywords: | Lubrication; Contact; Temperature | ||||||
Dates: |
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Institution: | The University of Sheffield | ||||||
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) | ||||||
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Depositing User: | Symplectic Sheffield | ||||||
Date Deposited: | 20 Dec 2023 09:23 | ||||||
Last Modified: | 20 Dec 2023 09:23 | ||||||
Status: | Published | ||||||
Publisher: | Elsevier BV | ||||||
Refereed: | Yes | ||||||
Identification Number: | https://doi.org/10.1016/j.triboint.2023.109210 |