The Structure and Dynamics of Non-Stationary Taylor-Vortex Flow
In going from laminar to turbulent flow, the circular Couette flow passes through a sequence of space and time periodic flow patterns . Increasing the Reynolds number, the first of the nonstationary flows may either be (i) the “wavy mode”, in which azimuthal waves are superimposed upon the stationary Taylor vortices, or (ii) the “jet instability”, where the fast outward flow oscillates in axial direction. For the wide gap geometry of our apparatus (R1/R2 = 0.5) both modes have wave number n = 1. Either of these modes may occur separately, depending on the boundary conditions and the wavelength of the stationary Taylor cells, so that neither one is a condition for the occurence of the other. We have studied both flow modes using conventional Laser-Doppler-Velocimetry and improved rate cross-correlation techniques.
KeywordsReynolds Number Critical Reynolds Number Vortex State Taylor Vortex Azimuthal Wave
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