Low-temperature behaviour of the engine oil

Kumbár, Vojtěch; Sabaliauskas, Artüras

doi:10.11118/actaun201361061763

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…To obtain relevant results, it is necessary to know essential rheological properties of given sample. Obviously, it is necessary to correctly classify the material prior any testing takes place (Kumbár and Sabaliauskas, 2013).…”

Section: Methodsmentioning

confidence: 99%

Temperature Dependence Viscosity and Density of Different Biodiesel Blends

Kumbár¹,

Skřivánek²

2015

Acta Univ. Agric. Silvic. Mendelianae Brun.

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The main goal of this paper is to assess the effect of rapeseed oil methyl ester (RME) concentration in diesel fuel on its viscosity and density behaviour. The density and dynamic viscosity were observed at various mixing ratios of RME and diesel fuel. All measurements were performed at constant temperature of 40 °C. Increasing ratio of RME in diesel fuel was reflected in increased density value and dynamic viscosity of the blend. In case of pure RME, pure diesel fuel, and a blend of both (B30), temperature dependence of dynamic viscosity and density was examined. Temperature range in the experiment was −10 °C to 80 °C. Considerable temperature dependence of dynamic viscosity and density was found and demonstrated for all three samples. This finding is in accordance with theoretical assumptions and reference data. Mathematical models were developed and tested. Temperature dependence of dynamic viscosity was modeled using a polynomial 3rd polynomial degree. Correlation coefficients R −0.796, −0.948, and −0.974 between measured and calculated values were found. Temperature dependence of density was modeled using a 2nd polynomial degree. Correlation coefficients R −0.994, −0.979, and −0.976 between measured and calculated values were acquired. The proposed models can be used for flow behaviour prediction of RME, diesel fuel, and their blends.

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Section: Methodsmentioning

confidence: 99%

Temperature Dependence Viscosity and Density of Different Biodiesel Blends

Kumbár¹,

Skřivánek²

2015

Acta Univ. Agric. Silvic. Mendelianae Brun.

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“…Viscosity is a unit of measurement of a fluid's resistance to flow at a certain temperature. The most basic parameters for evaluating conditions of internal combustion engine's oil are the viscosity [9][10] [11]. Every vehicle manufacturer advises their customers to choose the correct engines oil viscosity to their engines by using the engine's specific owner's manual.…”

Section: Kinematic Viscositymentioning

confidence: 99%

Deterioration in Physical Engine Oil Properties after Different Trip Length

Hameed¹

2021

KJAR

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Fresh engine oils or engine lubricants lose some of their properties during service, engine lubricant deterioration leads to change in oil properties, which ultimately have effect on engine overall performance. Therefore, it is very important to characterize used engine lubricants at different using conditions to check the performance and ability of existing oils, which in turn protects engine parts and also designs new formulations to produce better type of engine oil or improve the existing oil. Therefore, optimizing engine oil lubricant changing time is very important for reducing environmental impact but renewing engine lubricant before it is due rises a customer’s cost. In this study, the most significant parameters such as kinematic viscosity, flash point and fire point were chosen to determine the changes and deterioration in engine oil properties. The oil samples were multigrade fully synthetic with SAE gradation 10W-30 grand ecodrive is used in 5 different passenger cars. Having information about these properties are crucial chemical and physical behaviours of engine oils and for keeping engine’s lifecycle. The test results of this work show that after 10,000 km, 10W-30 Delta NL motor oil brand (special synthetic with API SL) oil properties such as kinematic viscosity at cold start, 40 °C and 100 °C decreased 22.92%, 23.61% and 22.92% respectively. In addition, both flash point and fire point decreased 15.6% and 14.22% consecutively for the base properties, and according to the test results this type of engine oil is suitable to use for 10,000 km.

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“…The dynamic viscosity is one of critical behaviour of automobile engine oil as state in (Maggi, 2006) and (Kumbár et al, 2013). In this time exist many and many additives which is can infl uence to fl ow behaviour of liquids.…”

Section: Introductionmentioning

confidence: 99%

Excessive Additive Effect On Engine Oil Viscosity

Kumbár¹

2014

Acta Univ. Agric. Silvic. Mendelianae Brun.

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The main goal of this paper is excessive additive (for oil fi lling) eff ect on engine oil dynamic viscosity. Research is focused to commercially distribute automotive engine oil with viscosity class 15W-40 designed for vans. There were prepared blends of new and used engine oil without and with oil additive in specifi c ratio according manufacturer's recommendations. Dynamic viscosity of blends with additive was compared with pure new and pure used engine oil. The temperature dependence dynamic viscosity of samples was evaluated by using rotary viscometer with standard spindle. Concern was that the oil additive can moves engine oil of several viscosity grades up. It is able to lead to failure in the engine. Mathematical models were used for fi tting experimental values of dynamic viscosity. Exponential fi t function was selected, which was very accurate because the coeffi cient of determination R 2 achieved high values (0.98-0.99). These models are able to predict viscosity behaviour blends of engine oil and additive.

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Low-temperature behaviour of the engine oil

Abstract: KUMBÁR VOJTĚCH, SABALIAUSKAS ARTÜRAS: Low-temperature behaviour of the engine oil. Acta

Cited by 9 publications

References 6 publications

Temperature Dependence Viscosity and Density of Different Biodiesel Blends

Temperature Dependence Viscosity and Density of Different Biodiesel Blends

Deterioration in Physical Engine Oil Properties after Different Trip Length

Excessive Additive Effect On Engine Oil Viscosity

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