Compute the friction pressure drop along a straight pipe from friction factor f, length L, diameter D, density ρ and velocity v using the Darcy formula, for pipe network hydraulics and pump energy estimation.
输入摩擦系数 f、管长 L、管径 D、密度 ρ、流速 v,求压降。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Darcy-Weisbach equation | Δp = f·(L/D)·(ρv²/2) | Darcy 1857 / Weisbach 1845 |
| Friction factor | Laminar f=64/Re; turbulent via Colebrook-White/Moody chart | Moody 1944 / Colebrook 1939 |