![]() Since liquids are normally incompressible, an increase in pressure doesn't bring the molecules significantly closer together. Viscosity is normally independent of pressure, but liquids under extreme pressure experience an increase in viscosity. That external force (F) is proportional to Shear rate (SR), Dynamic Viscosity (η), and Surface area (A). The internal resistance of a liquid flow suggests an external force applied in the movement of a liquid. Kinematic viscosity is a more fundamental property.Īpart from the difference between dynamic viscosity and kinematic viscosity, a few relations of this concept should be cleared. It is utilized when inertia and viscous force are dominant.ĭynamic force is utilized only when viscous force is dominant. This represents the ratio between shear stress to shear strain. ![]() This represents the ratio between dynamic viscosities to density. The symbol of the kinematic viscosity is V. Whereas, dynamic viscosity represents the viscous force of the liquid. ![]() It represents the inertia as well as the viscous force of the fluid. It gives more information about the force required to make the liquid flow at a specific rate. To be precise, it explains how fast the liquid is moving when a certain amount of external force is applied. Flowrate can be defined by volume flowrate, mass flowrate, or velocity.This is defined as the diffusivity of momentum. For liquids heavier than water the density can be defined by degrees Baume (Be+), or degrees Twaddell. For liquids lighter than or equal to water the density can be defined as degrees API, or degrees Baume (Be-). Kinematic viscosity is equal to the dynamic viscosity divided by the fluid density.
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