Resistance Coefficient

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Resistance coefficient, abbreviated as K, a dimensionless number, represents how much resistance to flow the obstruction presents.  This is the inverse of flow coefficient which is how much flow capacity an obstruction allows.

Resistance Coefficient Formula

\(\large{ K =  f_d \; \frac {l} {d} }\)


\(\large{ K }\) = resistance coefficient

\(\large{ f_d }\) = Darcy friction factor

\(\large{ l }\) = length of pipe

\(\large{ d }\) = pipe inside diameter

\(\large{ \frac{l}{d} }\) = equivalent length of the obstruction (dimensionless)


Tags: Equations for Coefficient Equations for Orifice