Abstract
This paper presents an analysis of the mutual dynamic relation between the impeller discharge flow of a standard Rushton turbine impeller and a standard radial baffle at the wall of a cylindrical mixing vessel under turbulent regime of flow of an agitated liquid. A portion of the torsional moment of the baffle corresponding to the region of the force interaction of the impeller discharge stream and the baffle is calculated under the assumption of constant angular momentum in the flow region between the impeller and the baffles. This theoretically obtained quantity is compared with the torsional moment of the baffles calculated from the experimentally determined distribution of the peripheral (tangential) component of dynamic pressure along the height of the radial baffle in pilot plant mixing equipment. It follows from the results of our calculations that for both investigated impeller off-bottom clearances the theoretically determined transferred torsional moment of the baffles in the area of interference between the impeller discharge flow and the baffles agrees fairly well with experimentally determined data and, moreover, that more than 2/3 of the transferred torsional moment of the baffles as a whole is located in the above mentioned interference area.
Highlights
An axially located standard Rushton turbine impeller in a cylindrical vessel with radial baffles exhibits the main force effects – radial and peripheral [1]
The distribution of the peripheral components of dynamic pressure affecting a radial baffle at the wall of a cylindrical pilot plant vessel with an axially located axial or radial flow rotary impeller under turbulent regime of flow of agitated liquid was determined experimentally [2, 3, 4]
The vertical distribution of the peripheral component of dynamic pressure along the height of the radial baffle coincides with the flow pattern in an agitated system with a standard Rushton turbine impeller [5]
Summary
An axially located standard Rushton turbine impeller in a cylindrical vessel with radial baffles exhibits the main force effects – radial and peripheral [1]. The distribution of the peripheral (tangential) components of dynamic pressure affecting a radial baffle at the wall of a cylindrical pilot plant vessel with an axially located axial or radial flow rotary impeller under turbulent regime of flow of agitated liquid was determined experimentally [2, 3, 4]. The angular displacement of the target b is directly proportional to the peripheral force F affecting the balancing springs (see Fig. 3). The vertical (axial) distribution of the peripheral component of dynamic pressure along the height of the radial baffle coincides with the flow pattern in an agitated system with a standard Rushton turbine impeller [5]. The aim of this study was to analyse the force interaction of the impeller discharge stream and the corresponding part of the radial baffle and to compare the results of such an analysis with available experimental data
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