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Table 1 Comparison of the geometrical details of the rectors used and the turbulence parameters during the fermentation process

From: Periodic-peristole agitation for process enhancement of butanol fermentation

  Traditional Rushton impeller Periodic- peristole reactor
Reactor volume 4 L 4 L
The tank diameter, D 0.14 0.14
The tank height (m), H 0.25 0.25
Mixed mode Rushton impeller Peristole
Main Flow type Axial and radius direction Axial direction
Impeller diameter (m), d 0.03
Number of blades 1
Power input (Pm) 23 W 18 W
Agitation rate (rpm) 55
Shrinking rate (m/s) 0.005
Eddy length (m) 9.54 × 10−5 1.28 × 10−4
Velocity range (m/s) 0–0.173 0–0.0269
The maximum turbulence intensity (%) 2.3 25.7
Mixing time (s) 120 95