9/10/2023 0 Comments Calculating viscosity index![]() ![]() In the viscosity test, the fluid is placed in a specially designed glassware tube (Figure 1) and allowed to equilibrate at the desired temperature. Where μ is the dynamic viscosity, ρ is the density of the fluid, and ν is the kinematic viscosity. Kinematic viscosity is the ratio of dynamic viscosity to density: The (metric) units are g/(cm-s) or centipoise. Dynamic viscosity, or absolute viscosity, is a measure of the internal resistance of the fluid to motion. There are two types of viscosity - dynamic viscosity and kinematic viscosity. ![]() Typically, 100☏ and 210☏ are used for kinematic viscosity measurements in English units, and 40☌ and 100☌ are used for viscosity measurements using the metric system. ![]() If the viscosity is measured using the metric system, then viscosity is reported in centistokes, or cSt. If the temperature is measured in English units, then the units for viscosity are Saybolt Universal Seconds (SUS). Viscosity is a measure of a fluid’s resistance to flow at a given temperature. Viscosity and the viscosity index are terms that are applied not only to quenchants, but also to many other areas in machining, lubrication, and tribology. Just as an example, to calculate viscosity index we can use online viscosity index calculator or excel tools.I n this column, we will discuss the viscosity and viscosity index. Common methods for viscosity index calculations are ASTM D2270 and ISO 2909. Q: How to calculate viscosity index?Ī: The viscosity index of a fluid (usually oil) is calculated from its viscosity at 40 and 100☌. Therefore higher viscosity index or higher VI means fluid is more stable and less changes in viscosity over a wide temperature ranges. Viscosity index indicates the change in fluid viscosity in dependence of temperature. Q: What is viscosity index?Ī: Viscosity index of a fluid is a calculated number according to ASTM D2270 or ISO 2909. ![]() For example the viscosity of honey is higher than the water. High viscosity fluid has more resistance to flow than a low viscosity fluid. If viscosity of fluid is high, most likely it is difficult to pour. Hence high viscosity fluids flow less easily or slower. Low viscosity fluids (low resistance to move) flow or pour more easily and faster. Therefore oil/fluids are usually measured at the same temperature to calculate viscosity. Lubricants Viscosity and Viscosity index Q: What is Viscosity?Ī: Viscosity is a fluid’s resistance to flow at given temperature. Press Calculate button to calculate kinematic viscosity (KV) As before, use Clear button to reset and calculate a new viscosity. Calculate Viscosity use calculator 3 to calculate viscosity (KV) Enter known viscosity index (VI) and kinematic viscosity (KV) in table 3. Click Calculate to get KV As previously stated, use Clear button to start a new calculation. Enter kinematic viscosity (KV) in the second row. Similarly with known viscosity index (VI) and viscosity It is possible to calculate viscosity For example enter viscosity index (VI) in the first row of second table. Calculate Viscosity possibility is to calculate kinematic viscosity from viscosity index. Finally, press Clear button to start again. Click Calculate button to get viscosity index (VI). In the first row table 1, Enter kinematic viscosity (KV) at 40☌, In the same way enter kinematic viscosity in the second row. To calculate viscosity index we need viscosity of an oil both at 40☌ and 100☌. Standard practice for viscosity index (VI) calculation as per ASTM D2270 and ISO 2909. ![]()
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