The gassed power (Pg) can be determined using correlations expressing the PJ Po ratio. The correlation developed by Reuss et al. (204) using dimensional analysis is given by:

Pg/ Po = 0.0312. (NRe)0.064. (NFr)-1.64. (Na)-038. (T/ D)0.8 (3.18)

where NA is the aeration or flow number and is represented as Qg/ND3 where Qg is the volumetric flow rate of gas and T is the diameter of the vessel.

The power aeration curve (Figure 3.12) which is a plot of Pg/ Po versus the aeration number can be determined for a vessel with liquid height to vessel diameter ratio and stirrer speed (205).

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