Darcy Weisbach equation (pressure loss form)

Input(s)

L: Length of the Pipe $(\mathrm{m})$

$\rho$: Density of Fluid $\left(\mathrm{kg} / \mathrm{m}^{3}\right)$

V: Average Velocity of the Fluid Flow, Equal to the Volumetric Flow Rate per Unit Cross-sectional Wetted Area $(\mathrm{m} / \mathrm{s})$

L: Lift Force (Newton)

D: Hydraulic Diameter of the Pipe (for a Pipe of Circular Section, equals the Internal Diameter of the Pipe) (m)

$\boldsymbol{f}_{\boldsymbol{D}}$: Dimensionless Coefficient Called the Darcy Friction Factor (dimensionless)

Output(s)

$\Delta \mathrm{P}$: Pressure Loss due to Friction (m)

Formula(s)

$$ \Delta P=L * f_{D} * \frac{\rho}{2} *\left(\frac{V^{2}}{D}\right) $$

Reference(s)

Wikipedia.org.