The measure of the rate of change of viscosity with temperature. For example, the higher the VI the less tendency for the lubricants viscosity to change in the presence of thermal fluctuations.
Relationship between viscosity change of an oil with change in temperature; an empirical measure of the temperature coefficient of viscosity.
Arbitrary number that describes the rate at which oilís viscosity changes with changes in temperature. High VI oils are desirable because they display less viscosi‚ty change with temperatures.
A numeric value that is a measure of a fluids tendency to thin out at high temperatures or thicken up at low temperatures. Calculated based on viscosity measurements at 40 °C and 100°C. Phosphate ester control fluids tend to thicken up more than mineral oils of the same viscosity grade and most systems have a minimum operating temperature requirement. Running with cold fluid will increase pressure drops across filters and screens.
Relationship of viscosity to temperature of a fluid. High viscosity index fluids tend to display less change in viscosity with temperature than Iow viscosity index fluids.
Viscosity is affected by temperature and viscosity index (VI) is a measure an oil's ability to maintain its viscosity regardless of temperature. A scale of 0 to 100 is used to indicate the oil's resistance to change in viscosity, and the higher the viscosity index number, the greater the oil's resistance to change in viscosity with temperature.
measures the fluids change of viscosity with temperature
Is a measure of the rate of change of viscosity with temperature. Oils with high VI have low viscosity changes. ( 010)
The measure of an oil's ability to resist changes in viscosity when subjected to changes in temperature.
A number to indicate the change in viscosity of an oil when heated.
empirical unitless number indicating the effect of temperature change on the kinematic viscosity of an oil. The higher the viscosity index, the smaller the relative change in viscosity with temperature.
A commonly used measure of a fluid's change of viscosity with temperature. The higher the viscosity index, the smaller the relative change in viscosity with temperature.
Viscosity index is a petroleum industry term. It is a lubricating oil quality indicator, an arbitrary measure for the change of kinematic viscosity with temperature. The viscosity of liquids decreases as temperature increases.