EngiRef / Fluids Engineering Formula
Darcy-Weisbach Equation
Darcy-Weisbach Equation: Head loss due to friction in pipe flow. A Pipe Flow formula in fluids engineering. Variables hf, f, L, D, v and g, each with SI and…
Pipe Flow
Specification
- Name
- Darcy-Weisbach Equation
- Discipline
- fluids
- Category
- Pipe Flow
- LaTeX
- h_f = f \frac{L}{D} \frac{v^2}{2g}
- Description
- Head loss due to friction in pipe flow
- Conditions
- Steady, incompressible, fully developed flow; f is Darcy friction factor
- Can solve for
- hf, f, L, D, v
- Tags
- darcy, weisbach, friction, head loss, pipe
Variables
| Symbol | Name | Unit | Si Unit | Imperial Unit |
|---|---|---|---|---|
| hf | Head Loss | m | m | ft |
| f | Friction Factor | — | — | — |
| L | Pipe Length | m | m | ft |
| D | Pipe Diameter | m | m | ft |
| v | Flow Velocity | m/s | m/s | ft/s |
| g | Gravity | m/s² | m/s² | — |