What is the Blasius friction factor?

The Blasius correlation is the simplest equation for computing the Darcy friction factor. Because the Blasius correlation has no term for pipe roughness, it is valid only to smooth pipes. The Blasius correlation is valid up to the Reynolds number 100000.

What does a high friction factor mean?

The friction factor caused by the internal wall roughness has a greater effect on the friction factor in small pipe sizes. This means that a small diameter pipe will approach its rough condition and have a higher friction factor than a larger diameter pipe of the same material.

What does friction factor indicate?

1. Definition of friction factor. The friction factor is representing the loss of pressure of a fluid in a pipe due to the interactions in between the fluid and the pipe.

Why does friction factor increase with diameter?

The results show that as the Reynolds number of the capsule increases, the friction factor due to solid phase alone decreases. Furthermore, as the capsule to pipe diameter ratio increases, the friction factor due to solid phase in the flow increases.

Who is the inventor of the Fanning friction factor?

Stuart W. Churchill developed a formula that covers the friction factor for both laminar and turbulent flow. This was originally produced to describe the Moody chart, which plots the Darcy-Weisbach Friction factor against Reynolds number. The Darcy Weisbach Formula

Which is larger the Fanning or Darcy friction factor?

Darcy friction factor formulae. The Darcy friction factor is also known as the Darcy–Weisbach friction factor, resistance coefficient or simply friction factor; by definition it is four times larger than the Fanning friction factor.

How is the Fanning equation related to wall roughness?

In this case, the friction factor of the Fanning equation can be calculated using the Hagen-Poiseuille equation (see Poiseuille Flow ). For turbulent flow, both Reynolds number and the wall roughness influence the friction factor. At high Reynolds number, the friction factor of rough pipes becomes constant, dependent only on the pipe roughness.

How is the Darcy-Weisbach friction factor related to laminar flow?

Various explicit approximations of the related Darcy friction factor have been developed for turbulent flow. Stuart W. Churchill developed a formula that covers the friction factor for both laminar and turbulent flow. This was originally produced to describe the Moody chart, which plots the Darcy-Weisbach Friction factor against Reynolds number.