Spin up and down of vortices Rotating water in a container

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Water tank 2 household plastic cylindrical containers Diameter: approx. 12cm Height: approx. 14cm In one, the 4 rotating blades are placed in a cross in the middle of the base of the container. In the other container, the blades are placed evenly around the perimeter. Working fluid Water   Visualization Styrene beads are mixed into the water, and a slide projector is used to light up the tank from the side. The tanks are then photographed with a stationary camera.   Experimental process Water was placed in the containers, which were then placed in turn on the rotating table and rotated.