Pipe-run pressure drop from friction factor, length, diameter and velocity. h_f = f·(L/D)·V²/2g.
Formula
$$ h_f = f \cdot \frac{L}{D} \cdot \frac{V^2}{2g} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $f$ | Darcy friction factor | - | Moody / Colebrook |
| $L$ | Pipe length | m | layout |
| $D$ | Internal diameter | m | pipe spec |
| $V$ | Mean velocity | m/s | derived |
| $g$ | Gravity | m/s² | 9.81 |
Sources
- White - Fluid Mechanics.