![]() ![]() ![]() Viscosity is the property of fluid which defines the. For compressible liquids (gases), kinematic viscosity depends on pressure, and for incompressible liquids, kinematic viscosity is independent of pressure. Air, of primary interest in aerodynamics, has a relatively small viscosity, and in some theories, it is described as a perfect fluid one that has zero. Where u is the average fluid velocity within the pipe and d is the inside diameter of the pipe.Īpplication of dynamic forces (and the Reynolds number) to the real world: sky-diving, where friction forces equal the falling body's weight. For gases we take air or O2 as a standard fluid with density, 1.293 kg/m3. Calculate the volume or mass of a quantity of gas or liquid. Dynamic viscosity is a constant of proportionality, whose unit is kg / m s (or equivalently, N s/m 2, or Pa s, or poise 0.1 Pa s). ![]() The density of a fluid, is generally designated by the Greek symbol ρ Dynamic Viscosity In fluid flow and heat transfer studies, the ratio of dynamic viscosity to density appears frequently. ![]()
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