Oscillatory and Steady Flows in the Annular Fluid Layer inside a Rotating Cylinder

Figure 1

The annular layer of PMS-20 silicon oil inside the cylinder with radius  cm (rotation rate  rps, relative filling ): the solid line shows the interface between the fluid and the air; the interface is displaced from the equilibrium position with the centre at (dotted line); is the radius of the air column. The cylinder rotates anticlockwise.