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We present numerical simulations as well as experimental results concerningtransitions between Taylor vortices and spiral vortices in the Taylor-Couettesystem with rigid, non-rotating end-walls in axial direction. As in the axialperiodic case, these transitions are performed by wavy structures appearing viaa secondary bifurcation out of Taylor vortices and spirals, respectively. Butin the presence of rigid lids, pure spiral solutions do not occur but aresubstituted by primary bifurcating, stable wavy spiral structures (wSPI).Similarly to the periodic system, we found a transition from Taylor vortices towSPI mediated by so called wavy Taylor vortices (wTVF) and, on the other hand,a transition from wSPI to TVF triggered by a propagating defect. We furthermoreobserved and investigated the primary bifurcation of wSPI out of basic Ekmanflow.

End-wall effects on the transition between Taylor vortices and spiral vortices