Modified capillary number

Input(s)

$\boldsymbol{\mu}_{\mathrm{w}}$: Viscosity of water $(\mathrm{cP})$

$\boldsymbol{\mu}_{\mathbf{o}}$: Viscosity of oil (cP)

$\sigma$: Interfacial tension $($ dyn $/ \mathrm{cm})$

v: Characteristic velocity (ft/D)

Output(s)

Mc: Modified Capillary Number (dimensionless)

Formula(s)

$$ M c=\left(\mu_{w} * \frac{v}{\sigma}\right) *\left(\frac{\mu_{w}}{\mu_{o}}\right)^{0.4} $$

Reference(s)

Petrowiki.org.