scholarly journals Temperature dependent kinematic viscosity of different types of engine oils

2009 ◽  
Vol 57 (4) ◽  
pp. 95-102 ◽  
Author(s):  
Libor Severa ◽  
Miroslav Havlíček ◽  
Vojtěch Kumbár
Keyword(s):  
Kinematic Viscosity ◽  
Engine Oil ◽  
Combustion Engines ◽  
Temperature Dependent ◽  
Engine Oils ◽  
Concentric Cylinders ◽  
Viscosity Behavior ◽  
Viscosity Grade ◽  
And Performance ◽  
Increasing Temperature

The objective of this study is to measure how the viscosity of engine oil changes with temperature. Six different commercially distributed engine oils (primarily intended for motorcycle engines) of 10W–40 viscosity grade have been evaluated. Four of the oils were of synthetic type, two of semi–synthetic type. All oils have been assumed to be Newtonian fluids, thus flow curves have not been determined. Oils have been cooled to below zero temperatures and under controlled temperature regulation, kinematic viscosity (mm2 / s) have been measured in the range of −5 °C and +115 °C. Anton Paar digital viscometer with concentric cylinders geometry has been used. In accordance with expected behavior, kinematic viscosity of all oils was decreasing with increasing temperature. Viscosity was found to be independent on oil’s density. Temperature dependence has been modeled using se­ve­ral mathematical models – Vogel equation, Arrhenius equation, polynomial, and Gaussian equation. The best match between experimental and computed data has been achieved 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. Proposed models can be used for description and prediction of rheological behavior of engine oils.

scholarly journals Rheological profiles of blends of the new and used motor oils

2013 ◽  
Vol 61 (1) ◽  
pp. 115-121 ◽  
Author(s):  
Vojtěch Kumbár ◽  
Adam Polcar ◽  
Jiří Čupera
Keyword(s):  
Mathematical Model ◽  
Temperature Dependence ◽  
Dynamic Viscosity ◽  
Rheological Behaviour ◽  
Engine Oil ◽  
Engine Oils ◽  
Used Engine Oil ◽  
And Performance ◽  
Increasing Temperature ◽  
Motor Oils

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.

scholarly journals Experimental Investigation of the Viscosity Parameters Ranges—Case Study of Engine Oils in the Selected Viscosity Grade

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3152 ◽  
Author(s):  
Artur Wolak ◽  
Grzegorz Zając ◽  
Kamil Fijorek ◽  
Piotr Janocha ◽  
Arkadiusz Matwijczuk
Keyword(s):  
Energy Efficient ◽  
Kinematic Viscosity ◽  
Primary Objective ◽  
Laboratory Measurements ◽  
Mahalanobis Distances ◽  
Engine Oils ◽  
Secondary Objective ◽  
Viscosity Grade ◽  
The Difference

The primary objective of the research was to compare the viscosity parameters of the same viscosity grade engine oils, as declared by the manufacturers, to the actual laboratory measurements. The secondary objective was to briefly investigate (1) what kind of information oil manufacturers provide in the product data sheets of the studied oils, and (2) the potential savings resulting from the use of the energy efficient oils. The study material consisted of 42 selected synthetic engine oils that belong to the 5W-30 viscosity grade. Stabinger SVM 3001 viscometer was used to determine kinematic viscosity at −20 °C, 40 °C, 100 °C and 130 °C. The HTHS (high temperature high shear), CCS (cold cranking simulator), FTIR (Fourier-transform infrared spectroscopy) and GC (Gas Chromatography) measurements were also performed for the samples that had the lowest and the highest kinematic viscosity. Large differences (5–25%) between oil producers’ declarations and the results of laboratory tests were found. Although all of the engine oils tested met the 5W-30 grade standards, the high variability of viscosity measurements needs to be reported. The difference between the oil with the highest and the oil with the lowest kinematic viscosity at −20 °C was 11,804 mm2/s. The outlying temperature-related viscosity profiles were recovered using Mahalanobis distances which identified 16 out of 42 analyzed oil samples as atypical.

scholarly journals Low-temperature behaviour of the engine oil

2013 ◽  
Vol 61 (6) ◽  
pp. 1763-1767 ◽  
Author(s):  
Vojtěch Kumbár ◽  
Artüras Sabaliauskas
Keyword(s):  
Low Temperature ◽  
Temperature Dependence ◽  
Low Temperatures ◽  
Kinematic Viscosity ◽  
Engine Oil ◽  
Economic Losses ◽  
Temperature Behaviour ◽  
Engine Oils ◽  
Theoretical Assumptions ◽  
Automobile Engines

The behaviour of engine oil is very important. In this paper has been evaluated temperature dependence kinematic viscosity of engine oils in the low temperatures. Five different commercially distributed engine oils (primarily intended for automobile engines) with viscosity class 0W–40, 5W–40, 10W–40, 15W–40, and 20W–40 have been evaluated. The temperature dependence kinematic viscosity has been observed in the range of temperature from −15 °C to 15 °C (for all oils). Considerable temperature dependence kinematic viscosity was found and demonstrated in case of all samples, which is in accordance with theoretical assumptions and literature data. Mathematical models have been developed and tested. Temperature dependence dynamic viscosity has been modeled using a polynomials 3rd and 4th degree. The proposed models can be used for prediction of flow behaviour of oils. With monitoring and evaluating we can prevent technical and economic losses.

ABOUT THE QUESTION OF CHEMMOTOLOGY OF MOTOR OILS AND THEIR APPLICATION FOR GAS ENGINE

2015 ◽  
Vol 2 (2) ◽  
pp. 522-527
Author(s):  
Толмачев ◽  
D. Tolmachev ◽  
Голубенко ◽  
Natalya Golubenko
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Quantitative Description ◽  
Internal Combustion ◽  
Engine Oil ◽  
Combustion Engines ◽  
Gas Engine ◽  
Engine Oils ◽  
Motor Oils

The article describes some of chemmotology processes in systems: engine oil – elements of internal combustion engines. Motor oil is regarded as an important element in the construction of an internal combustion engine, and it is necessary to make quantitative description of its condition which changing over time for its operability forecasting. In connection with the increasing number of vehicles with gas engines, the topics of necessity of special engine oils use for the gas internal combustion engine and of monitoring of their quality indicators are mentioned

scholarly journals Analysis of selected results of engine oil tests

2019 ◽  
Vol 302 ◽  
pp. 01010
Author(s):  
Bogdan Landowski ◽  
Monika Baran
Keyword(s):  
Kinematic Viscosity ◽  
Viscosity Index ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Drive Unit ◽  
Passenger Car ◽  
Engine Oils ◽  
Different Temperatures ◽  
Rotary Viscometer

The study presents selected results of viscosity tests performed for different temperatures of lubricating oil with viscosity marked as 5w30. Viscosity tests of new oil and oil right after being used have been compared. Lubricating oil used in a drive unit of a passenger car was tested. A vehicle in which oil had been changed irregularly was purposefully selected for the tests. Its mileage was over 15-20 thousand kilometers. Upon testing the vehicle mileage was above 265 thousand kilometers. The values of selected characteristics of the analyzed engine oils have been determined including: density, kinematic viscosity and viscosity index. FUNGILAB rotary viscometer was used for measurement of the oil kinematic viscosity.

Engine Oils for Landfill Service: Requirements and Proof of Performance

2010 ◽  
Author(s):  
Frederick W. Girshick
Keyword(s):  
Internal Combustion Engines ◽  
Field Testing ◽  
Engine Oil ◽  
Combustion Engines ◽  
Oil Consumption ◽  
Engine Oils ◽  
Oil Companies ◽  
Used Oil ◽  
Acid And Base ◽  
New Generation

This paper presents the results of a field test comparing four engine oil formulations in commercial landfill service for 16 months. The major differences among the oils were combustion chamber deposit control and oil consumption control, whose mechanism is likely to be control of liner deposits. Control of these deposits led to extension of the time between top-end overhauls. Control of used oil parameters, such as acid and base numbers, was achieved, allowing extended oil drain intervals. The requirements for engine oils in reciprocating internal combustion engines in landfill service will be reviewed briefly. The development of a new generation of engine oils for landfill service will be presented, including deployment of detergent chemistry previously unused in this application. The theoretical justification and preliminary screener testing of this chemistry justified the full scale field testing which is shown. This chemistry has since been commercialized by several oil companies. The operational benefits of engine oils specifically designed for this service will be discussed.

scholarly journals Changes in the kinematic viscosity of engine oil during the operation of marine diesel engines

2021 ◽  
Vol 2131 (3) ◽  
pp. 032060
Author(s):  
V Zhukov ◽  
O Melnik ◽  
E Khmelevskaya
Keyword(s):  
Diesel Engines ◽  
Kinematic Viscosity ◽  
Environmental Safety ◽  
Engine Oil ◽  
Engine Oils ◽  
Marine Diesel ◽  
Required Quality

Abstract A prerequisite for the long-term and safe operation of marine diesel engines is the high quality of operational materials, which include engine oils and coolants. The required quality of operational materials is ensured by the introduction of additives into their composition, which are now increasingly used as nanoparticles. During operation, as a result of the destruction of additives, the operational properties of coolants and engine oils deteriorate. The conducted studies allowed us to evaluate the change in the lubricating ability of engine oils of two brands that are used in marine diesels during operation. As a characteristic of the lubricating ability of the oil, its kinematic viscosity was used. The experimental determination of the kinematic viscosity of engine oil samples having different periods of operation, and the subsequent mathematical processing of the experimental results made it possible to determine the dependencies characterizing the change in the kinematic viscosity of engine oil during its operation. The research results confirm the possibility of scientific justification for extending the use of marine diesel engine oils, which reduces operating costs and increases the environmental safety of marine diesel engines.

scholarly journals Changes of engine oil flow properties during its life cycle

2010 ◽  
Vol 58 (4) ◽  
pp. 203-208 ◽  
Author(s):  
Libor Severa ◽  
Miroslav Havlíček ◽  
Jiří Čupera
Keyword(s):  
Kinematic Viscosity ◽  
Arrhenius Equation ◽  
Flow Behavior ◽  
Engine Oil ◽  
Flow Properties ◽  
Used Oil ◽  
Concentric Cylinders ◽  
Oil Flow ◽  
Gaussian Fit ◽  
Motorcycle Engine

The work is focused on quantification of influence of operation on flow properties of motorcycle engine oil. Three different kinds of synthetic engine oil (MOTUL) were tested, namely unused oil, run-in oil (650 km after engine reboring) and regular engine oil (6200 km of motorcycle operation). The samples were frozen to below zero temperatures and kinematic viscosity was continuously monitored in the range of −5 °C and +115 °C. Consequently, the kinematic viscosity at reference temperatures of 0, 40 and 100 °C was compared. Viscosity was measured by digital viscometer with concentric cylinders measuring geometry. The biggest difference occurred in case of lower temperatures where e.g. at 0 °C decrease to 29 % and 43 % of its original value was detected for used oil and run-in oil respectively. Flow behavior was modeled using several mathematical models –Arrhenius equation, exponential, and Gaussian equation. The best match between experimental and computed data was received in case of Gaussian fit with R2 = 0.997 and 0.992 for run-in and used oil, respectively. The models are ge­ne­ral­ly usable for description of rheological behavior of given engine oil.

scholarly journals Engine Oil Deterioration based on the Viscosity, flash point and fire point for Different Trip Length

2021 ◽  
pp. 13-20
Author(s):  
Dana Kareem Hameed
Keyword(s):  
Kinematic Viscosity ◽  
Flash Point ◽  
Engine Oil ◽  
Motor Oil ◽  
Test Results ◽  
Passenger Cars ◽  
Engine Oils ◽  
Fire Point ◽  
Oil Deterioration ◽  
Overall Performance

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.

scholarly journals Analysis of mechanical energy losses in marine diesels

2021 ◽  
Vol 5 (2(61)) ◽  
pp. 26-32
Author(s):  
Sergii Sagin ◽  
Volodymyr Madey ◽  
Tymur Stoliaryk
Keyword(s):  
Diesel Engines ◽  
Internal Combustion Engines ◽  
Structural Characteristics ◽  
Internal Combustion ◽  
Engine Oil ◽  
Lubricant Layer ◽  
Combustion Engines ◽  
Engine Oils ◽  
Boundary Lubricant ◽  
Marine Diesel

The object of research is marine diesel engine oils, which provide lubrication, cooling and separation of friction surfaces. The subject of the research is the process of ensuring minimum mechanical losses in marine diesel engines. A problematic point in ensuring the lubrication of the cylinder-piston group and motion bearings is the lack of analytical and experimental studies that establish the relationship between the structural characteristics of engine oils and mechanical losses arising in marine internal combustion engines. The degree of orientational ordering of molecules and the thickness of the boundary lubricating layer are considered as the structural characteristics of engine oils. The determination of these values was carried out using the optical method based on the anisotropy of the light absorption coefficient by the boundary lubricant layer and the isotropic volume of the liquid (engine oil). The assessment of the level of mechanical losses arising in marine diesel engines was carried out according to an indirect indicator – the overshoot of the rotational speed and the time to reach the steady state of operation in the event of a change in load. It has been experimentally established that for engine oils used in marine internal combustion engines, the thickness of the boundary layer can be 15–17.5 µm. Motor oils, which are characterized by a higher ordering of molecules and a thickness of the boundary lubricant layer, ensure the flow of transient dynamic processes with less overshoot and a shorter transient time. This ensures the level of minimal mechanical losses occurring in marine diesel engines. The technology for determining the structural characteristics of engine oils can be used for any type and grade of oil (mineral or synthetic; high or low viscosity; used in both circulating and cylinder lubrication systems). The method of indirect assessment of mechanical losses of marine diesel engines can be used for any types of internal combustion engines of ships of sea and river transport (low-, medium- and high-speed; as well as performing the functions of both main and auxiliary engines).

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