クローズド平羽根回転翼攪拌槽における液相混合

抄録

Agitation impellers for liquid-phase mixing in chemical processes were designed based on a conventional disk turbine impeller with six flat blades which sucks liquid across the planes including the upper and lower edges of the blades. The altered impellers have structures for the inflow entrance to be confined partially or fully. We call these “partially and fully closed impellers”, respectively, and the prototype “open impeller”. Liquid flows in the impeller rotational region of a baffled vessel with the closed impellers were examined for the flow path between the neighboring blades of the rotating impeller and the internal flows were compared with that with the open impeller. Energy consideration in terms of the dimensionless parameters on the basis of the flow and power measurements demonstrated that the partially closed impeller was successful in the flow and head characteristics. The power transmission efficiency were enhanced notably for the fully closed impeller because of a reduced viscous loss.