A-to-Z Guide to Thermodynamics,
Heat & Mass Transfer, and Fluids Engineering
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There are two dimensionless groups given the name Darey number.

where Δp is the pressure drop, D the diameter, ρ fluid density, u fluid velocity, and L the length over which the pressure drop is measured. f is the Fanning friction factor (see Friction Factors).

where D' is the permeability coefficient of a porous medium with units m2/s (see Darcy's Law).

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