## What is the Fanning equation?

Flow of gas. For gas flow problems as encountered in oil field production operations, the Fanning equation for pressure drop may be used. A modified form of this equation employing units commonly used in oil field practice is1–6: W = F L ( MCFD ) 2 S T Z 20 , 000 d 5 P av.

### What is Fanning friction factor used for?

The Fanning friction factor is an element in the calculation of pressure loss due to friction in a pipe. It is a function of the roughness of the pipe and the level of turbulence within the liquid flow. These factors can be determined experimentally but are more often taken from charts and diagrams.

What is Darcy Weisbach formula for heat loss?

Darcy-Weisbach Friction Loss Equation: For rectangular pipes (ducts), D=4A/P is known as the hydraulic diameter.

What is Fanning friction factor for laminar flow in pipe?

Fanning Friction Factor For laminar flow (Re < 2100), the friction factor was independent of the surface roughness and it varied linearly with the inverse of Reynolds number. In this case, the friction factor of the Fanning equation can be calculated using the Hagen-Poiseuille equation (see Poiseuille Flow).

## What is the friction factor for turbulent flow?

It is also known as the Darcy-Weisbach friction factor or Moody friction factor and is four times larger than the Fanning friction factor. where f is the Darcy friction factor and Re is the Reynolds number. When the Re > 4000 (that is the Reynolds number is greater than 4000), the flow is regarded as turbulent.

### How do you use the Darcy-Weisbach equation?

To find the pressure drop in a pipe using the Darcy Weisbach formula: Multiply the friction factor by pipe length and divide by pipe diameter.

What is Darcy Weisbach friction factor?

The Darcy friction factor is a dimensionless quantity used in the Darcy-Weisbach equation for the description of friction losses in pipe flow as well as open channel flow. It is also known as the Darcy-Weisbach friction factor or Moody friction factor and is four times larger than the Fanning friction factor.

What is friction factor for turbulent flow?