Measurements of small radius ratio turbulent Taylor-Couette flow etc15 Tracking Number 305Presentation: Session: Vortex Dynamics 3 Room: Room B Session start: 10:30 Wed 26 Aug 2015 Roeland van der Veen r.c.a.vanderveen@utwente.nl Affifliation: University of Twente Sander Huisman s.g.huisman@gmail.com Affifliation: University of Twente Sebastian Merbold merbold@tu-cottbus.de Affifliation: Brandenburg University of Technology Cottbus - Senftenberg Chao Sun c.sun@utwente.nl Affifliation: University of Twente Uwe Harlander haruwe@tu-cottbus.de Affifliation: Brandenburg University of Technology Cottbus - Senftenberg Chirstoph Egbers egbers@tu-cottbus.de Affifliation: Brandenburg University of Technology Cottbus - Senftenberg Detlef Lohse d.lohse@utwente.nl Affifliation: University of Twente Topics: - Transport and mixing, - Vortex dynamics and structure formation, - Wall bounded flows Abstract: In Taylor-Couette flow, the radius ratio ($\eta = r_i/r_o$) is one of the key parameters of the system. For small $\eta$, the asymmetry of the inner and outer boundary layer becomes more important, affecting the general flow structure and boundary layer characteristics. Using high-resolution particle image velocimetry we measure flow profiles for a radius ratio of 0.5 and Taylor number of up to $6.2\cdot10^9$. By measuring at varying heights, roll structures are characterized for two different rotation ratios of the inner and outer cylinder. In addition, we investigate how the turbulent bursts coming from the inner and outer cylinder affect the flow profiles. These results exemplify how curvature affects flow in strongly turbulent Taylor-Couette Flow. |