Coefficient of Viscosity

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Coefficient of Viscosity

Coefficient of viscosity ( \(\eta\) (Greek symbol eta) ) (also called viscosity coefficient) is the tangential friction force required to preserve a unit velocity gradient between two parallel layers of liquid of unit area.  The greater the coefficient of viscosity the greater the force required to move the layers at a velocity.                         

Coefficient of Viscosity Formula

\(\large{  \eta = \frac { Fl } { Av }  }\)         

Where:

\(\large{ \eta }\)  (Greek symbol eta) = coefficient of viscosity

\(\large{ A }\) = area

\(\large{ F }\) = tangential force

\(\large{ l }\) = distance between the layers

\(\large{ v }\) = velocity

Solve for:

\(\large{ F = \eta   \frac { Av } { l }  }\)

 

Tags: Equations for Viscosity