Acta Univ. Agric. Silvic. Mendelianae Brun. 2013, 61(1), 115-121 | DOI: 10.11118/actaun201361010115

Rheological profiles of blends of the new and used motor oils

Vojtěch Kumbár, Adam Polcar, Jiří Čupera
Department of Energineering and Automobile Transport, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic

The objective of this paper is to find changes of a rheological profile of the new engine oil if the used engine oil will be add. And also find changes of a rheological profile of the used engine oil if the new engine oil will be add. For these experiments has been created the blends of the new and the used engine oil. The temperature dependence of the density [kg.m-3] has been measured in the range of -10 °C and +60 °C. The instrument Densito 30PX with the scale for measuring engine oils has been used. The dynamic viscosity [mPa.s] has been measured in the range of -10 °C and +100 °C. The Anton Paar digital viscometer with the concentric cylinders geometry has been used. In the accordance with the expected behaviour, the density and the kinematic viscosity of all oils was decreasing with the increasing temperature. To the physical properties has been the mathematical models created. For the temperature dependence of the density has been used the linearly mathematical model and the exponentially mathematical model. For the temperature dependence of the dynamic viscosity has been used the polynomial 6th degree. The knowledge of density and viscosity behaviour of an engine oil as a function of its temperature is of great importance, especially when considering running efficiency and performance of combustion engines. Proposed models can be used for description and prediction of rheological behaviour of engine oils.

Keywords: engine oil, blend, viscosity, density, temperature, modeling
Grants and funding:

The research has been supported by the project IP 14/2011 "Degradace motorového oleje používaného v zemědělské technice", and the project TP 1/2011 "Monitorování výkonových parametrů traktorového motoru", both financed by IGA AF MENDELU.

Received: September 26, 2012; Published: April 8, 2013  Show citation

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Kumbár, V., Polcar, A., & Čupera, J. (2013). Rheological profiles of blends of the new and used motor oils. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 61(1), 115-121. doi: 10.11118/actaun201361010115
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