Abstract
Breakdown of the turbulent flow in a spinning tube with a diffuser at the end was studied by flow visualization and Digital Particle-Image-Velocimetry (DPIV). The swirl of the flow was introduced at the entrance of the rotating tube with a honeycomb package. The results show, that for the range of parameters investigated, breakdown is initiated at critical Rossby-numbers of Ro≈0.6 similar to those observed in other experiments.
The bursted part of the vortex is of slender conical shape containing near stagnant flow. Its downstream end is characterized by a jump-like contraction near the entrance to the diffuser. The flow then evolves into a jet, enhancing the swirl near the axis. In this region asymmetric instabilities and wavy flow patterns could be observed. Perturbations caused by them travel upstream but do not change the near-axisymmetric shape of the bursted part of the vortex.
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Brücker, C. (1998). Breakdown of Spinning Tube Flows. In: Krause, E., Gersten, K. (eds) IUTAM Symposium on Dynamics of Slender Vortices. Fluid Mechanics and Its Applications, vol 44. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5042-2_27
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DOI: https://doi.org/10.1007/978-94-011-5042-2_27
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