The flow pattern in the mixing equipment depends on the mixing method, geometric characteristics of the agitator, kettle, baffle, etc., fluid properties and rotational speed. In general, when the agitator shaft is installed in the center of the kettle, the agitation will produce three basic flow patterns: 1 tangential flow 2 axial flow (b, c in the figure) 3 radial flow (a, d, e, in the figure) f). The above three basic flow patterns may usually exist at the same time. Among them, the axial flow and the radial flow play a major role in the mixing, while the tangential flow should be suppressed, and the tangential flow can be weakened by the addition of the baffle to enhance the axial flow and the radial flow.
Different paddle and paddle convection models have an important impact, as shown on the left. In the figure, b and c are axial flows, but the use of large diameter PBT blades or increased fluid viscosity causes the flow to transform into a radial flow. In addition, the use of a multi-layer PBT paddle also produces a separate radial flow for each blade.
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