Impeller concave disk turbine

The equations above allow one to predict the operating conditions in any coalescing gas-liquid system equipped with a flat-blade disk turbine. A similar analysis and flow map have been produced for a concave-blade impeller such as the... 

The value of g/u in Eq. (6) can easily fall as low as 0.4 for 6-blade flat-blade disk turbines (Fig. 6) and downflow pitched-blade turbines and hydrofoils (Table 3). However, for modern impellers with parabolic concave blades (e.g., Scaba SRGT, Chemineer BT6, Lightnin R-130), g/u typically falls to only about 0.9 (and then only at high FIq values). The ability to deliver high power makes these impellers highly suitable for gas-liquid operations. 

The observed cavity structures have inspired improvements to the Rushton-type turbine to increase the gas-handling capacity of the impeller to allow more gas and, hence, higher gas concentrations in the reactor. To accomplish this, impellers shonld create smaller cavities in similar structures while minimizing flooding. The concave blade disk tnrbine, discussed in Section 6.3, has been shown to accomplish these goals. 

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