Sept. 6-8, 2001

Northwestern University

Evanston, IL USA

12th International Couette Taylor Workshop
 

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Wavy Vortex Flow Animation

The animation below shows the velocity vectors measured using Particle Image Velocimetry. Measurements were made at a radius ratio of 0.83 at a rotating Reynolds number of Ta=253. The cylinders are horizontal. The upper boundary is the inner cylinder, and the lower boundary is the outer cylinder. The red asterisk marks the center of the vortex at that instant. White pluses mark previous positions of the centers.

Note the following:

  • Vortex centers move axially and radially.
  • At times there is a net axial flow as fluid winds around the vortices.
  • At times there is a net flow into the middle vortex; at other times there is a net flow out of the vortex.
  • Significant quantities of fluid are transferred between adjacent vortices.
Further details of these measurements are described in: "Spatio-temporal character of non-wavy and wavy Taylor-Couette flow," Steven T. Wereley and Richard M. Lueptow, J. Fluid Mech. 364:59-80 (1998).

Wavy Vortex Flow at Ta=253