What is absolute viscosity?
Absolute viscosity is the rate of how the fluid resists flow in response to external force. The fluid density is not a factor and the measures concern applications such as oil that is forced by a tube, or an object pushed by the liquid by the force of the spindle -powered engine. The internal resistance of the fluid is calculated and the shear resistance directly correlates with the input force. For precise measurement of either absolute or kinematic viscosity or measurement of fluid under the gravitational force, it is multiplied by its density. The cinematic viscosity is calculated by dividing the absolute number of liquid densities.
Absolute viscosity measurements are performed for research purposes for various fluids, including oils, quality control, and analyze the lubricant characteristics for lubricating machinery. Laboratory measurements are common and absolute or dynamic viscosity is also used to analyze oil through a viscosimeter in place. It is calculated by multiplying the cinematic viscosity of the fluid by its specific weight for Newtonian fluids because these fluids haveThe same viscosity no matter what shear speed is.
non-Newton fluids do not follow the law of liquid mechanics defined by Sir Isaac Newton and their viscosity reduces, the higher the shear speed. They are called thixotropic fluids and their viscosity is also increasing as the shear speed is reduced. They consist of a fabric that is suspended in the liquid. It is not possible to directly measure the absolute viscosity of the non -Jewton fluid. Obvious viscosity must be determined by considering the shear speed and the temperature of the fluid during the initial measurement.
Absolute viscosity of oil gives a series of accurate thickness of the film oil. Such a value is important for testing oil in the field or in production facilities. Standard based on the absolute viscosity of water at 68 ° F (about 20 ° C) was developed in the 30s, which facilitated the determination of the viscosity of other fluids. This value is used to calibrate the viscoups and samples of oilsAnd it is an essential measurement in predicting the behavior of used oils and to assess their quality. Special laboratory and on site are used to ensure accurate assessment of fluid viscosity, where it is most important.