Table 3. Impeller types used in bioreactorsa.

Impeller

Flow

NP

Disk turbine

radial

6.0

Flat blade turbine

radial

2.8

Pitched blade turbine

axial

1.2

Curved blade turbine

radial

2.8

Hydrofoil

axial

0.3

Gas dispersing hydrofoil

axial

0.8

Marine helix

axial

0.3

Bar turbine

radial

0.7

a Dickey and Fenic, 1976; Kubera and Oldshue, 1992.

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