Friction Factor |
Item | Data |
---|---|
Formula | |
Drawing | |
Nomenclature | f/2=friction factor D=Pipe diameter in m u_{m}=mean velocity in m/s ΔPf=pressure drop due to friction in Pa L=length of pipe in m ρ=specific gravity in kg/m3 |
Usual Values | In Laminar regime f/2=8/Re In turbulent regime, different correlations can be used Blasius (only applicable to smooth pipes f/2=0.023.Re^{-0.20} Churchill (applicable for any Re and ratio e/D) With e the pipe roughness in m Another possibility is to use the Moody Diagram |
Related | In Laminar regime, the volumic flowrate can be calculated thanks to the Hagen-Poiseuille equation Q=volumic flowrate in m3/s μ=dynamic viscosity in Pa.s |
Source | Mecanique et Rheologie des fluides en genie chimique, Midoux, Lavoisier 1993, page 162, page 274-275 |