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 | - |
Common questions
- What is the Darcy-Weisbach Equation formula?
- Head loss due to friction in pipe flow. It sits under Pipe Flow, Fluids engineering in the EngiRef reference.
- What do the symbols in the Darcy-Weisbach Equation formula mean?
- In Darcy-Weisbach Equation, hf is head loss in m; f is friction factor; L is pipe length in m; D is pipe diameter in m; v is flow velocity in m/s; g is gravity in m/s².
- When does the Darcy-Weisbach Equation formula apply?
- Darcy-Weisbach Equation holds under this condition: Steady, incompressible, fully developed flow; f is Darcy friction factor.