Abstract
This paper presents an analysis of hydrodynamics in a tank with a 45° and 60° pitched blade turbine impeller operating while emptying the mixer and with an axial agitator working during axial pumping-down of water at different water levels above the impeller. Measurements made with the PIV method confirmed the change in direction of pumping liquid after the level dropped below the critical value, with an almost unchanged liquid stream flowing through the mixer. It was found that an increase in the value of the tangential velocity in the area of the impeller took place and the quantity of this increase depended on the angle of the blade pitch and the rotational frequency of the impeller. Change in this velocity component increased the mixing power.
Highlights
Batch production of suspensions in mechanically stirred tanks is often used in industrial practice [1,2]
In the work of Paul et al [7] is there mention of a significant increase in the forces acting on the agitator as the liquid surface passes through it
The aim of the work is to determine the effect of changes in the liquid flow in the mixer on the mixing power during emptying with the mixer working
Summary
Batch production of suspensions in mechanically stirred tanks is often used in industrial practice [1,2]. During tests on the suspension production process in a tank with a capacity of 300 m3, an increase in the need for mixing power was observed when emptying the tank shortly before the emergence of the impeller from the mixed liquid [3]. In the work of Paul et al [7] is there mention of a significant increase in the forces acting on the agitator as the liquid surface passes through it. This has not been fully explained so far
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