高レイノルズ数じゃま板付きかくはん槽内流れの数値シミュレーションと実験による検証(流体工学,流体機械)

概要

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Unsteady flow in a baffled stirred tank of which Reynolds number based on the tip velocity and the radius of tank is 45 000 has been simulated by solving numerically Navier-Stokes and continuity equations. LES model were used for sub-grid scale flows. Calculated results show unsteady flow fields in the whole region of the tank during about 16 complete impeller revolutions. As the results we present the occurrence and the disruption of large vortices, and the generation of many small eddies which are nearly homogeneous. The calculated visualized flow field, time-averaged velocity and turbulent intensity distributions are fairly in good agreement with the experimental data. It indicates that the present simulation procedure and results are applicable to describe the flow field in the real high Reynolds number baffled stirred tank. The calculated results also show the role of the baffle plate which blocks the tangential flow and induces the complicated flows that increase the stirring effect. The present results elucidate the unsteady flow mechanism in a high Reynolds number baffled stirred tank.
2007-02-25