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Journal Articles Tribology International Year : 2024

In-situ ultrasonic viscometry of lubricants under temperature and shear

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 and ) 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 10^6 s-1 .
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hal-04355015 , version 1 (20-12-2023)

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G. Peretti, N. Bouscharain, N. Dörr, Fabrice Ville, R.S. Dwyer-Joyce. In-situ ultrasonic viscometry of lubricants under temperature and shear. Tribology International, 2024, 191, pp.109210_1 - 109210_9. ⟨10.1016/j.triboint.2023.109210⟩. ⟨hal-04355015⟩
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