The Mechanical Engineering Handbook
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Darcy Number

Darcy Number Equation


$$ Da = \frac{ k }{ L^2 } $$ where:

Da   =   Darcy Number   (Dimensionless)

k   =   Permeability of the medium  (m²)

L   =   Characteristic Length  (m)


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Equation Assumptions


Assumptions:

  • Fluid flow is laminar.
  • The medium is porous and homogeneous.
  • Relationship between pressure drop and flow rate is linear.
  • Flow is incompressible.