Discharge liquid flow produced by closed impeller with flat blades for agitation

Abstract

For a baffled vessel agitated by turbine type impellers with six flat blades, the liquid flows discharged by the impellers were measured using the particle tracking velocimetry (PTV). The impellers were used in the two configurations for the blades to be open and closed. For the the two configurations of impellers, the time-averaged flow with induction of a secondary flow and the turbulence in the flow were evaluated and the discharge flow characteristics were compared. The external flow of the closed impeller has an increased inflow from the surrounding of discharge region and a decreased turbulence downstream near the baffles.