Abstract
An experimental survey has been made of the different kinds of coherent waveforms which occur in the finite amplitude region of unstable circular Couette flow. Gap ratios ranging from quite wide to very narrow and Taylor numbers up to the onset of turbulence have been investigated. Throughout this range all the waveforms can be assigned to five basic types: regular Taylor cells, spirals, a subharmonic asymmetric mode and two other types of rotationally asymmetric modes. Sketches of the basic types of cells and a description of how they are modified in various regions of the modal diagram are presented. It is shown how the normal modes of the system may be combined to form the basic modes. A comparison is made between the present data and previous reports of the higher modes; the theoretical work on this problem is also related to the observed results.
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