### Darcy Equation Fluids Flow Equation

**Fluid Flow Table of Contents**

Hydraulic and Pneumatic Knowledge

*Darcys Equation Fluids Flow Equation - also called Darcy–Weisbach equation. *

In fluid dynamics , the **Darcy–Weisbach equation **is a phenomenological equation, which relates the head loss — or pressure loss — due to friction along a given length of pipe to the average velocity of the fluid flow.

The Darcy–Weisbach equation contains a dimensionless friction factor, known as the **Darcy friction factor **. This is also called the **Darcy–Weisbach friction factor **or **Moody friction factor **. The Darcy friction factor is four times the Fanning friction factor , with which it should not be confused.

The frictional head loss can be calculated using a mathematical relationship that is known as Darcys equation for head loss. The equation takes two distinct forms. The first form of Darcys equation determines the losses in the system associated with the length of the pipe.

*Darcys Equation Calculator <--- Open *

Formula 1

*h _{f} = f ( L / D ) ( v^{2} / ( 2 g ) ) *

where:

*f* = friction factor (unitless)

*L* = length of pipe (ft)

*D* = diameter of pipe (ft)

*v* = fluid velocity (ft/sec)

*g* = gravitational acceleration (ft/sec^{2})

Related:

- Head Loss Darcy - Weisback Equation
- Head Loss Darcy Calculator - Weisback Equation
- Babcock Steam Flow Rate Formula and Calculator
- Swamee-Jain Friction Factor Equation and Calculator
- Churchill Friction Factor Formulae and Calculator
- Harris Formula Pressure and Fluid Flow Equation and Calculator
- Liquid Pressure Drop in Pipe and Pipe Fittings Spreadsheet Calculator
- Friction Loss - Fluid Flow Hydraulic and Pneumatic

Reference:

- Piping Calculations Manual,

E. Shashi Menon

SYSTEK Technologies, Inc