![]() ![]() If, however, the viscosity varies significantly with the rate of shear, different results can be obtained from viscometers of different capillary diameters. NOTE The result obtained from this document is dependent upon the behaviour of the sample and is intended for application to liquids for which primarily the shear stress and shear rates are proportional (Newtonian flow behaviour). The range of kinematic viscosities covered in this test method is from 0,2 mm 2/s to 300 000 mm 2/s over the temperature range ?20 ☌ to +150 ☌. The dynamic viscosity, η, is obtained by multiplying the measured kinematic viscosity by the density, ρ, of the liquid. Dynamic Viscosityĭynamic viscosity determines the shear stress ratio of the fluid to the shear rate.This document specifies Procedure A, using manual glass viscometers, and Procedure B, using glass capillary viscometers in an automated assembly, for the determination of the kinematic viscosity, ν, of liquid petroleum products, both transparent and opaque, by measuring the time for a volume of liquid to flow under gravity through a calibrated glass capillary viscometer. Viscosity has two types that are Dynamic and Kinematic Viscosity. They are synonymous if the fluid density is known. They define the flow of the fluid in various ways, i.e., how they are measured. There are two different viscosity measures used to describe fluids, dynamics and kinematic viscosities. Or it can be measured with household equipment, such as calculating how fast a liquid can travel on a slight incline after a certain period of time. Viscosity can be measured by a viscometer, a piece of equipment that measures the force necessary to move through a liquid. As you'll see in this equation, if the spere's speed is lower, the viscosity would be higher. The SI unit of viscosity is Pascal seconds (Pa s). ![]() ![]() G is the acceleration because of gravity. ?p is the density between the fluid and sphere tested, Where η (eta) is defined as the viscosity, ![]()
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