Title Kinematic viscosity of four-stroke engine oils /
Translation of Title Keturtakčių variklių alyvos kinematinė klampa.
Authors Kumbár, Vojtěch ; Dostál, Petr ; Čupera, Jiří ; Sabaliauskas, Artūras
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Is Part of Jaunųjų mokslininkų darbai.. Šiauliai : VšĮ Šiaulių universiteto leidykla. 2012, Nr. 3(36), p. 134-139.. ISSN 1648-8776
Keywords [eng] engine oil ; kinematic viscosity ; mathematical modeling
Abstract [eng] Six different commercially distributed four-stroke motorcycle engine oils of 10W–40 viscosity class were evaluated. Two of the oils were of semi–synthetic type, four of synthetic type. All oils were assumed to be Newtonian fluids, thus flow curves were not determined. Oils were cooled to below zero temperatures and under controlled temperature regulation kinematic viscosity (mm2.s-1) was measured in the range of –5°C and +115°C. Anton Paar digital viscometer with concentric cylinders geometry was used. In accordance with expected behavior, kinematic viscosity of all oils was decreasing with increasing temperature. Viscosity was found to be independent of oil density. Temperature dependence was modeled using several mathematical models: Vogel equation, Arrhenius equation, polynomial, and Gaussian equation. The best match between experimental and computed data was obtained for Gaussian equation (R2 =0.9993). Knowledge of viscosity behavior of an engine oil as a function of its temperature is of great importance, especially when considering running efficiency and performance of combustion engines.
Published Šiauliai : VšĮ Šiaulių universiteto leidykla
Type Journal article
Language English
Publication date 2012