![]() (1966), "Calculating Viscosity Index Between VI = o and VI = 300", Industrial Lubrication and Tribology, Vol. The ambiguity arises from the fact that very high VI liquids can have the same index for two different oils whose viscosities are identical at 100☏. When we know the viscosity of an oil at 40☌ and 100☌ we can calculate its viscosity index. between steep and flat viscosity‐temperature curves, as for Gulf Coast and Pennsylvanian oils, respectively) is now also used for oils with VI values above 100, with the result that ambiguous values are obtained, particularly above 130 VI. Modules to calculate the Viscosity Index or the oil viscosity at 100☌. During this time the introduction of additives (in particular of VI improvers) has led to the manufacture of oils of such remarkably flat viscosity‐temperature curves that a procedure which initially was meant to be an interpolation between 0 and 100 VI ( i.e. more Base oil mixtures Calculate viscosity or ratio of oils needed to achieve a viscosity. If you have the viscosity in centiPoise, divide the centiPoise value by the oil's viscosity to get centiStokes.FOR OVER a quarter of a century the petroleum industry has become accustomed to quoting a single figure, called the Viscosity Index (VI), to indicate how rapidly the viscosity of lubricating and hydraulic oils changes with a variation in temperature. Calculate kinematic viscosity and/or the viscosity index of a formulation. This calculator uses centiStokes (cSt), which are equivalent to mm^2/s. The viscosity index of conventional mineral oil is well known and is between 95 to 100 because the VI has no units of measure. This is then compared to a scale based on two reference oils. 40 degrees C and 100 degrees C to determine an oil’s VI. Higher quality oils tend to have higher viscosity indices, and while there are ranges in every category, a synthetic oil will tend to have a much higher viscosity index than its conventional counterpart. The viscosity is measured at two temperatures i.e. In this calculation, the candidate oil is compared with an oil with a VI of 100. If you know the viscosity of your oil at 40✬ and 100✬ (100✯ and 212✯) you can easily calculate its Viscosity Index. Rheology viscosity index published in Encyclopedia of Tribology. Since every fluid is different, its reaction to the same temperature is different. Oil needs to flow when cold, but not get too thin and runny when it's warm. The viscosity index is a measure of viscosity fluctuations with changes in temperature. That is, oil with a high VI will retain their viscosity over a wider temperature range and work as designed in both hot and cold environments.Ī higher VI is important when your machine will experience a big change in operating temperatures. The higher the viscosity index, the lower the change in viscosity. The degree to which the viscosity decreases determines the Viscosity Index (VI). The viscosity of an oil decreases as temperature increases. Viscosity Index Calculator Here we are discussing the rule of calculating the viscosity Index. Viscosity Index and what you need to know
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |