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

\(\eta = \frac { Fl } { Av }\)          \( coefficient \; of \; viscosity  \;=\;  \frac { tangential force \;\;x\;\;  distance \; between \; the \; layers  } { area \;\;x\;\; velocity }\)


\(\eta\) (Greek symbol eta) = coefficient of viscosity

\(F\) = tangential force

\(l\) = distance between the layers

\(A\) = area

\(v\) = velocity

Solve for:

\(F = \eta   \frac { Av } { l }\)


Tags: Equations for Viscosity