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## Fanning friction factor
Fanning friction factor is a dimensionless number used in fluid flow calculations. It is related to the Shear stress at the wall as:
where: - τ is the shear stress at the wall
is the Fanning friction factor of the pipe*f*is the fluid velocity in the pipe*v***ρ**is the density of the fluid
## Additional recommended knowledge
The friction head can be related to the pressure loss due to friction by dividing the pressure loss by the product of the acceleration due to gravity and the density of the fluid. Accordingly, the relationship between the friction head and the Fanning friction factor is: where: *h*_{f}is the friction loss (in head) of the pipe.is the fanning friction factor of the pipe.*f*is the fluid velocity in the pipe.*v*is the length of pipe.*L*is a conversion factor.*g*_{c}is the pipe diameter.*D*
This friction factor is one-fourth of the Darcy friction factor, so attention must be paid to note which one of these is meant in the "friction factor" chart or equation consulted. Of the two, this is the more commonly used by Chemical Engineers and those following the British convention. Categories: Equations of fluid dynamics | Fluid dynamics |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Fanning_friction_factor". A list of authors is available in Wikipedia. |