There are several formulas for calculating the friction factor in slurry and fluid flow. The details are as under
(a) Hagen and Poiseuille equation (for laminar flow only where, Re ≤ 2100)
This is the most common formula to estimate the friction factor in laminar flow. It is used to construct a Moody chart for the laminar flow regime.
(b) Blasius correlation (for turbulent flow in smooth pipes Re< 100000)
The Blasius formula is used to determine the friction factor for Newtonian fully turbulent flow in smooth pipes. It is valid for only smooth pipes and up to the Reynolds number 100000 (105).
(c) Colebrook-White equation
Where relative roughness is negligible the following implicit formula applies for smooth pipes:
Application of the same equation is done in
4000 ≤ Re ≤ 100000000 (108)
Turbulent flow only.
(d) Prandtl correlation
The Prandtl correlation is not explicit, and it must be solved iteratively.
