Aeration Number

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:

Units	English	Metric
\(\large{ N_a }\) = Aeration number	\(\large{dimensionless}\)
\(\large{ Q }\) = volumetric flow rate of gas	\(\large{\frac{ft^3}{sec}}\)	\(\large{\frac{m^3}{s}}\)
\(\large{ n }\) = rotational speed	\(\large{\frac{deg}{sec}}\)	\(\large{\frac{rad}{s}}\)
\(\large{ d }\) = diameter of impeller	\(\large{in}\)	\(\large{mm}\)