Abstract
The stability of flow in a concentric annulus formed by rotating cylinders is well understood, but there is little information concerning the transitions which occur after the onset of spiral vortex flow. For both the arrow and wide gap cases ( N = 0·8 and N = 0·955), it has been shown that the initial spiral flow breaks down from a quasiperiodic to a chaotic mode. Three axial Teynolds numbers were studied, viz., Re a = 500, 1500, 2500. The introduction of digital techniques provided qualitative and quantitative information regarding the flow behaviour. The effects reported for Re a > 0 and recent results of other workers for Re a = 0 have been compared. The phenomenon of re-emergent flows has been observed at very high Taylor numbers and high axial Reynolds numbers.
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