When to use fanning friction factor and when to use darcys?
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SUMMARY
To determine the pressure loss or flow rate through pipe knowledge of the friction between the fluid and the pipe is required. This article describes how to incorporate friction into pressure loss or fluid flow calculations. It also outlines several methods for determining the Darcy friction factor for rough and smooth pipes in both the turbulent and laminar flow regime. Finally this article discusses which correlation for pressure loss in pipe is the most appropriate.
DEFINITIONS
ε \varepsilonε:Absolute RoughnessDhD_{h}Dh:Hydraulic DiameterRhR_{h}Rh:Hydraulic Radiusfff:Darcy Friction FactorfFf_{F}fF:Fanning Friction FactorDDD:Pipe Diameterε/D\varepsilon/Dε/D:Relative RoughnessReReRe:Reynolds NumberLLL:Length of Pipehfh_{f}hf:Head loss due to frictionVVV:Average Velocityggg:Gravityppp:Pressureρ\rhoρ:Density
To determine the pressure loss or flow rate through pipe knowledge of the friction between the fluid and the pipe is required. This article describes how to incorporate friction into pressure loss or fluid flow calculations. It also outlines several methods for determining the Darcy friction factor for rough and smooth pipes in both the turbulent and laminar flow regime. Finally this article discusses which correlation for pressure loss in pipe is the most appropriate.
DEFINITIONS
ε \varepsilonε:Absolute RoughnessDhD_{h}Dh:Hydraulic DiameterRhR_{h}Rh:Hydraulic Radiusfff:Darcy Friction FactorfFf_{F}fF:Fanning Friction FactorDDD:Pipe Diameterε/D\varepsilon/Dε/D:Relative RoughnessReReRe:Reynolds NumberLLL:Length of Pipehfh_{f}hf:Head loss due to frictionVVV:Average Velocityggg:Gravityppp:Pressureρ\rhoρ:Density
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