Power and Flow Characteristics of a rotationally reciprocating impeller

2014 Fiscal Year Final Research Report

• Project/Area Number: 25820381
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Properties in chemical engineering process/Transfer operation/Unit operation
• Research Institution: Kobe University
• Principal Investigator: KOMODA YOSHIYUKI 神戸大学, 工学(系)研究科(研究院), 准教授 (00397796)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: Laminar flow / Torque / PIV / 3D flow

Outline of Final Research Achievements

Mixing process in a cylindrical vessel induced by a rotationally reciprocating impeller was investigated in views of the variations of rotational torque and velocity field generated. A pair of vortices generated near the edge of the impeller is released from the impeller plate under a sufficiently large Reynolds number, resulting in a prompt fluid mixing everywhere in the vessel. Although the torque variation observed at the condition was similar to that under turbulent flow, the fluid flow generated was three dimensional but has very small fluctuation. It is suggested that the fluid flow keeps still laminar even at the superior-mixing condition.

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