![]() ![]() The ratio of dynamic viscosity to the density of the fluid is called kinematic viscosity. The fluid used in hydraulics, lubricants to avoid friction bearings, seals, etc. This viscometer can adjust the turning speed of the probe as it moves in the liquid, and the viscometer detects the variation in the sample’s viscosity as the speed. By measuring the force or torque, viscosity is determined. To measure dynamic viscosity, the rotational viscometers are one of the more popular instruments used, and in the liquid sample, these instruments rotate a probe. ![]() The dynamic viscosity = shearing stress/shearing rate change. The measure of fluid’s resistance to shear flow when some external force is applied is known as dynamic viscosity.įor describing the behavior of fluids under stress, it is useful, and also in describing non-Newtonian fluids by observing how viscosity changes as the shear velocity changes, it is mostly used. The tangential force required to move one horizontal plane of a fluid to another is called dynamic viscosity. In SI units, dynamic viscosity units are well established as mPa-s, and the most common kinematic viscosity units are cm2/s. The kinematic viscosity tells how fast the fluid moves when a certain force is applied, while dynamic viscosity gives you information on the force needed to make the fluid flow at a certain rate. The ratio of dynamic fluid viscosity to its density is called kinematic viscosity, and the unit of measurement is m2/s.Īny two different fluids will never have the same kinematic viscosity because of density difference but can have the same dynamic viscosity. The ratio of shear stress to shear strain is called dynamic viscosity, and usually, it is measured in centipoise (cP), and Pa-s is the unit of measurement. ![]()
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