# Aeration Number

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Aeration Number, abbreviated as $$N_a$$, a dimensionless number, is used for the agitated mixing of gas and liquids.

## Aeration Number formula

 $$\large{ N_a = \frac{ Q }{ n \; d^3 } }$$

### Where:

$$\large{ N_a }$$ = Aeration number

$$\large{ Q }$$ = volumetric flow rate of gas

$$\large{ n }$$ = rotational speed

$$\large{ d }$$ = diameter of impeller