Swamee-Jain Equation

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

The Swamee-Jain Equation is accurate to 1.0% of the Colebrook-White Equation for  \(\large{  10^{-6} < \frac{\epsilon}{d} < 10^{-2} }\)  and  \(\large{ 5,000 < Re < 10^8  }\).  See friction factor.

swamee-jain equation formula

\(\large{  f = \frac{0.25}{[log \; (\frac{\epsilon}{3.7\;d} + \frac{5.74}{Re^{0.9}})]^2}  }\)   

Where:

\(\large{ \epsilon }\)  (Greek symbol epsilon) = absolute roughness

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

\(\large{ Re }\) = Reynolds number

 

Tags: Equations for Friction Equations for Flow