Abstract
Three modes of instability are observed experimentally in the flow between a stationary and a rotating disk. Mode I instability appears as steady-state, circular cells, whereas mode II instability consists of moving spiral vortices. Mode III instability is of a boundary layer type as the vortices are stationary and confined within the rotating boundary layer. The critical cell sizes are found to be comparable to the disk gap size, with a distinct value for each mode. The axis-orientation angles of these cells or vortices for all three modes are equal or less than zero, in contrast to class B waves observed in the one-disk flow. The three modes of instability observed originate from different basic velocity fields: the torsional Couette flow, the Batchelor-type velocity field, and the self-similar velocity field. These basic flows can be realized in the laboratory as the basic flow parameter 1/Ek=Ωh2/ν is increased.
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