# Vadasz Number

Vadasz number, abbreviated as Va, a dimensionless number, governs the effect of porosity on flow in a porous media.

## Formulas that use Vadasz Number

\(\large{ Va = \frac { \phi \; Pr }{ Da } }\) |

### Where:

\(\large{ Va }\) = Vadasz number

\(\large{ f_d }\) = Darcy friction factor

\(\large{ \phi }\) (Greek symbol phi) = porous media

\(\large{ Pr }\) = Prandtl number