When the Mixer is agitating a low viscosity liquid, the fluid caused by the blade will have three different speeds: axial speed, radial speed, and tangential speed. The axial speed and radial speed play a major role in the agitation and mixing of the liquid.
In the process of mixing with a Stirred Mixer, whether it is a paddle turbine or a propeller blade, as long as it is installed in the center of the tanks and the blade rotates fast enough, the tangential speed generated by the blade causes the liquid to circle around the Agitator shaft. The trajectory rotates to form different flow layers while creating vortices. The higher the blade speed, the deeper the vortex produced, and the effect on the multiphase material is not mixed but layered discrete.
When the vortex depth reaches a certain range, it will also inhale on the liquid surface, causing density changes and jar shaking. The most common way to avoid vortexing during agitation is to place a baffle on the inner wall of the can. The baffle has two functions. The first effect is to change the tangential flow, and the other is to increase the degree of turbulence of the agitated liquid to change the effect of the east.
For a liquid agitator with low viscosity, the baffle is mounted vertically on the inner wall of the can. For liquid agitated tanks of medium viscosity, the baffles are installed away from the inner wall to avoid the formation of stagnant areas behind the baffles and prevent solids from collecting behind the baffles. For liquid Mixing Tanks with a viscosity greater than 12 Pa.s, no baffles are required.
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