Viscosity Coefficient

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Viscosity coefficient ( \(\eta\) (Greek symbol eta) ) (also called coefficient of viscosity) 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.                         

Viscosity Coefficient Formula

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


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

\(\large{ A }\) = area

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

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

\(\large{ v }\) = velocity

Solve for:

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


Tags: Equations for Coefficient Equations for Viscosity