Viscosity is measured in terms of a ratio of shearing stress to the velocity gradient in a fluid. This precision is sufficiently good for works control, has been satisfactory for trading, and is within the requirements demanded by efficient lubrication. These calculations and tests help engineers develop and maintain the. A common way to calculate viscosity is to use a correlation related to the dead oil viscosity at surface at. Calculate the air flow requirement for your engine. Standard practice for calculating viscosity index from kinematic viscosity at 40 and.
In simpler terms, the viscosity index tells you how well a fluid can protect its viscosity during changes. Calculate viscosity using viscosity index nimac great britain. Viscosity can be measured using various methods, where the most common is dropping a material like ball or marble in the liquid container. I would like to know about the availability of a software for finding of viscosity of a mixture of two oils. If values are used other than 40c and 100c, astm d341 is applied before calculating the viscosity index. Calculate the viscosity using the viscosity index the calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced by our calculators. Astm d2270 viscosity index vi from free temperatures.
The resistance of a fluid or liquid to flow is termed as the viscosity. Due to this a shear stressmath\taumath is developed in the fluid element. Viscosity index of the solution copolymer of 3 % is 67. The calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced. A low viscosity index indicates high viscosity changes with temperature. After buying viscosity you will receive a license code that will activate your copy, so you dont need to download viscosity again. Nov 17, 2019 v i lu lh x 100 u is the oils kinematic viscosity at 40 c, and l and h are values based on the oils kinematic viscosity at 100 c. The timings can be used along with a formula to estimate the kinematic viscosity value of the fluid in centistokes cst. Viscosity 2 x ball density liquid density x g x a2. This program was designed to save time on manual calculations. Viscosity index was calculated from the measured viscosity at 40c and 100c. From the viscosity results, the product is obtained by dividing the viscosity at lowest speed by the viscosity at the highest speed.
Calculation of viscosity index the viscosity index of an oil is. Viscosity index was calculated from the measured viscosity at 40c. Kinematic viscosity formula viscosity is a concept where fluid shows struggle against a flowing, which is being distorted due to extensional stress forces or shear stress. What is the formula for calculating viscosity of a liquid. Compatible with other conventional and synthetic oils, it exceeds all automobile and light truck warranty requirements for gasoline and turbocharged engines where api sn and ilsac gf5 oil.
Kinematic viscosity is the sort which is computed by calculating the ratio of the fluid mass density to the dynamic fluid, viscosity or absolute fluid viscosity. Substitute both the values for dynamic and kinematic viscosity into the equation for density. I would point out that this problem has already been fully. The viscosity index according to din 2909 is calculated by comparing the change in viscosity of an oil with the two oils as a reference. Apparent viscosity is a calculation derived from tests performed on drilling fluid used in oil or gas well development. The material used should be less than or equal to half of the diameter of the cylinder and should sink in the fluid. Software for 2component oil mixture viscosity calculation posted in industrial professionals. Calculate the viscosity index from kinematic viscosity the calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced by our calculators. How to calculate viscosity powerblanket heating solutions. Calculator for viscosity index vi according to astm d2270 and iso 2909. Viscosity is a function of temperature, pressure, gravity and dissolved gas in the oil.
The viscosity of a fluid is its resistance to flow and is highly influenced by temperature. Standard practice for calculating viscosity index from. In this lesson, you will learn about viscosity what it is, how it is measured, and the equation needed to figure out the viscosity of a fluid. Viscosity definition, meaning, types, formula, unit, example. The thixotropic index is obtained by measuring the viscosity of a fluid at room or ambient temperature. This tutorial helps you to learn how to calculate viscosity of any liquidsfluids. If the film thickness should not be calculated, you can just enter zero. Calculate the viscosity index using one of the procedures given in 6. If a sphere is dropped into a fluid, the viscosity can be determined using the following formula.
Extensional viscosity can be measured with various rheometers that apply extensional stress. Calculation of viscosity index the viscosity index of an oil is calculated from its viscosities at 40 and100c. Our viscosity index calculator is our new online calculation tool where. Dec 05, 2007 calculating the viscosity of a blended liquid consisting of two or more liquids having different viscosities is a three step procedure. Astm d2270 viscosity index vi from 40c and 100c anton. Type into the reference section in blue the viscosity in cst at the temperature of the oil under investigation. Dynamic viscosity, also absolute viscosity, the more usual one typical units pas, poise, p. Type into the lookup section in red the known parameter ie either the viscosity or the temperature of the oil. The spreadsheet uses the lee, gonzalez and eakin correlation for the viscosity, and the cnga california natural gas association correlation for the compressibility factor. Kinematic viscosity is the dynamic viscosity divided by the density typical units m2s, stokes, st. Viscosity index calculate clear this information and all further technical advice is based on our understanding, the information provided, resulting present knowledge and experience. Astm viscosity index formulatable derivation chemistry. You must know both the kinematic and dynamic viscosity of a gas or liquid to calculate its density.
Viscosity is the resistance offered by the fluid layers when there is a relative movement between them. Perform the calculation and express the density in kilograms per. Standard practice for calculating viscosity index from kinematic viscosity at 40 and 100c1 this standard is issued under the. According to isotr 12812, 2008 the pressure viscosity coefficient. Viscosity index is a dimensionless number that represents how the viscosity of a hydraulic fluid changes with temperature. Another method for calculating the viscosity of air at a specified temperature and pressure will also be presented and discussed.
Follow the instructions displayed in the setup wizard. Modules to calculate the viscosity index or the oil viscosity at 100c. It can be represented with unit pascal seconds pas. It also applies to fluids like engine and automatic transmission oils, gear lubricants, and powersteering fluids.
Evonik oil additives has developed tools to aid in the calculation of blending efficiency, viscosity index, base oil mixtures, ccs viscosity, and gear oil formulations. The motive force driving the fluid out of the cup is the head of fluid. Viscosity can be measured using various methods, where the most common is dropping a material like ball or marble in the liquid. Kinematic viscosity formula definitions, formula and. This download is a fully functional version of viscosity, which will stop working after 30 days.
Interestingly, this equation forms the basis of astm chart d341 for viscositytemperature relationship, and the most general form of this. Volume viscosity can be measured with an acoustic rheometer. The dependency of the kinematic viscosity on the temperature can be comparatively assessed by means of the viscosity index. This excel spreadsheet will calculate the viscosity of natural gas. Viscosity index is determined using the formula much higher than that determined by the software. The use of any of the calculators results is at the users sole risk. Moreover the instrument is convenient to manipulate. Sep 20, 2019 calculate the viscosity of the liquid. The greater the viscosity index vi, the smaller the change in fluid viscosity for a given change in. Of all fluids, gases have the lowest viscosities, and thick liquids have the highest. Kinematic viscosity v sometimes viscosity is measured by timing the flow of a known volume of fluid from a viscosity measuring cup. Standard practice for calculating viscosity index from kinematic viscosity at 40 and 100c. A new model for the accurate calculation of natural gas viscosity.
Online hertzian calculator line contact this is a simple hertz contact calculator for elliptical and circular contacts. The viscosity index can be calculated using the following formula. Download32 is source for viscosity index calculater shareware, freeware download hermetic file search index module, glycemic index and weight loss, index your files home. Then the viscosity at temperature t is calculated with ubbelohdewalther equation according astmd341. It will be discussed and used in example calculations. Procedure a is applicable to petroleum products of viscosity index up to and including 100. Calculation of viscosity index from kinematic viscosity.
A high viscosity indexsignifies a relatively small change of kinematic viscosity with temperature. The higher the vi, the more stable the viscosity remains over temperature fluctuations. A corresponding matlab file can also be downloaded. The viscosity index can be calculated using the following f. As will be seen below, v is also identified with the hardcore volume of a segment, and it is there fore implicitly assumed in eq 2 that viscous flow occurs by segmental motion rather than by motion of whole molecules. Viscosity index tables astm international pages 1 9. Viscosity is a tensorial quantity that can be decomposed in different ways into two independent components. Specifically with reference to the reference oils considered and the table for it. For viscosity index calculation, you can use the formula. When we know the viscosity of an oil at 40c and 100c we can calculate. To continue using viscosity after this period you will need to purchase a license. Viscosity of liquid mixtures 3115 volume per segment in the solution, and y is a factor of order unity.
Our viscosity index calculator is our new online calculation tool where, by entering the results of your samples kinematic values at 40 c and 100 c, you can have the viscosity index value calculated in an instant. Petroleum products calculation of viscosity index from. In this paper viscosity index of hydraulic oil was determined using tree methods. The viscometer is used to measure the viscosity at two speeds one is a multiple or a factor of 10 of the other. How was the astm formula for viscosity index derived. Therefore, it is necessary to establish a fast, simple and accurate calculation model for natural gas viscosity calculation. Oil viscosity index and viscosity temperature relation about. Calculate viscosity of natural gas with excel excel. Kinematic viscosity formula definitions, formula and solved. The sutherland formula canbe used to calculate the viscosity of a gas at a specified temperature if the sutherland constant isavailable for the gas. Viscosity index was calculated from the measured viscosity at 40c and 100c using astm method d 2270 and was graphically determined using astm d 341.
Standard practice for calculating viscosity index from kinematic viscosity at specific, free temperatures. Moreover, many practical difficulties in engineering sites also limit viscosity measurement. Formula shell conventional motor oil is formulated for improved fuel economy and to provide the engine protection and performance required by modern engines. A bmi scale is used to calculate bmi or body mass index. Calculate or convert units of absolute and kinematic viscosity for flowmeters, analyzers, or transmitters. Table 1 of the method lists the basic viscosity values of. The calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced by our calculators. Plug your measurements into the equation to calculate the viscosity of the liquid. Software for 2component oil mixture viscosity calculation. L and h are the values of viscosity at 40c for oils of v i 0 and 100 respectively.
Unknown said hi samir, thank you for the pages, for a mixture of c1 0. It means by entering two companents base oils viscosity and compsition%, we should get approximate viscosity of the mixture after. Viscosity in centistokes 32 to 100 saybolt universal seconds. Viscosity 5 viscosity coefficients viscosity coefficients can be defined in two ways. For the example, the calculation would look like this. The first step involves calculation of the viscosity blending index vbi of each component of the blend using the following equation known as a refutas equation. Therefore, a fluid that has a high viscosity index can be expected to undergo very little change in viscosity with temperature extremes and is considered to have a stable viscosity. Calculate the viscosity index from kinematic viscosity. This shear stress math\taumath is directly proportiona. In your case viscosity of your oil at 100o is not clear.
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