Civil Engineering ⇒ Topic : Viscosity and its unit
it is the property of a fluid which resists relative motion of its adjacent layers. It is primarily due to cohesion and molecular momentum exchange between fluid layers.
dy = Distance measured normal to the direction of flow
Viscosity is defined as the property of a fluid which offers resistance to the movement of one layer of fluid over another adjacent layer of the fluid. When two layers of a fluid, a distance 'dy' apart, move one over the other at different velocities, say u and u + du as shown below
the viscosity together
with relative velocity causes a shear stress acting between the fluid lavers
Units of Viscosity : The units of viscosity is obtained by putting the dimensions of the quantities in above equationKinematic Viscosity : It is defined as the ratio between the dynamic viscosity and density of fluid. It is denoted by the Greek symbol (v) called 'nu'. Thus, mathematically,
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