Darcy friction factor

The Darcy friction factor is a dimensionless number used in internal flow calculations. It expresses the linear relationship between mean flow velocity and pressure gradient.

Related Topics:
Dimensionless number - Velocity - Pressure gradient

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It is defined as:

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f = rac{(rac{-d p*}{d x}) D_h}{0.5 ho V^2}

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where:

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• is the pressure drop per unit length
• $D\_h$ is the hydraulic diameter
• ρ is the fluid density
• V is the bulk velocity

The factor is named after French engineer Henry Darcy.

Related Topics:
French - Engineer - Henry Darcy

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