Darcy Weisbach equation (head loss form)
Input(s)
L: Length of the Pipe (m)
g: Acceleration due to Gravity \(\left(\mathrm{m} / \mathrm{s}^{2}\right)\)
V: Average Velocity of the Fluid Flow, Equal to the Volumetric Flow Rate per Unit Cross-sectional Wetted Area \((\mathrm{m} / \mathrm{s})\)
D: Hydraulic Diameter of the Pipe (For a Pipe of Circular Section, this Equals the Internal Diameter of the Pipe) (m)
\(f_{D}\): Dimensionless Coefficient Called the Darcy Friction Factor (dimensionless)
Output(s)
\(\Delta \mathrm{h}\): Head Loss Due to Friction (m)
Formula(s)
\[
\Delta h=f_{D} * \frac{1}{2 * g} *\left(\frac{V^{2}}{D}\right)
\]
Reference(s)
Wikipedia.org.