Characteristics of unsteady liquid flow produced by forward-reverse rotating impeller for agitation

Abstract

The agitator providing forward-reverse rotation whose rate changes periodically in the sinusoidal pattern employed an impeller with the disk turbine impeller with 12 flat blades, for turbulent agitation of liquid. The liquid flow discharged by the impeller was measured using the particle tracking velocimetry (PTV) and was compared with that with the conventional turbine type impeller with 6 flat blades. For the 12 flat blade impeller, an efficacy to rectify the flow was demonstrated as a decreased level of the turbulent flow relative to the mean flow.