Atkinson friction factor
Atkinson friction factor is a measure of the resistance to airflow of a duct. It is widely used in the mine ventilation industry but is rarely referred to outside of it.
Atkinson friction factor is represented by the symbol and has the same units as air density. It is related to the more widespread Fanning friction factor by
in which is the density of air in the shaft or roadway under consideration and is Fanning friction factor. It is related to the Darcy friction factor by
in which is the Darcy friction factor.
It was introduced by John J Atkinson in an early mathematical treatment of mine ventilation and has been known under his name ever since.
