Capillary number

Input(s)

$\mu_{w}$: Viscosity of Displacing Fluid $(\mathrm{cP})$

V: Characteristic Velocity (ft/D)

$\sigma_{o w}$: Surface or Interfacial Tension of Oil and Water Phases $(\mathrm{dyn} / \mathrm{cm})$

Output(s)

$\mathrm{N}_{\mathrm{c}}$: Capillary Number (dimensionless)

Formula(s)

$$ N c=\frac{\mu_{w} * V}{\sigma_{o w}} $$

Reference(s)

Wikipedia.org.