Stroboscopic two-dimensional ultrasonic velocity profiling for measuring flow transition in Taylor Couette systems |
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| Affiliation: | 1. Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan;2. Institute of Food, Nutrition and Health, ETH Zürich, 8092 Zürich, Switzerland;1. Advance Industrial Science and Technology, National Metrology Institute of Japan, Central 3, 1-1-1, Umezono, Tsukuba, Ibaraki 305-8563, Japan;1. School of Science, Shanghai Institute of Technology, Shanghai 200235, China;2. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;3. Physics of Fluids Group, University of Twente, AE Enschede, The Netherlands;1. Chair of Measurement and Sensor System Techniques, Faculty of Electrical and Computer Engineering, Technische Universität Dresden, 01062 Dresden, Germany;2. SolarWorld Innovations GmbH, Berthelsdorfer Str. 111A, 09599 Freiberg, Germany;3. Institute for Nonferrous Metallurgy and Purest Materials, TU Bergakademie Freiberg, Leipziger Str. 34, 09599 Freiberg, Germany |
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| Abstract: | Flow characterization in a Taylor Couette system was made by investigating the radial velocity component with Ultrasonic Doppler Velocimetry based flow mapping. With the technique presented in this work, it is possible to measure the radial velocity components for variable axial position in a Couette cell within Taylor vortex flow (TVF), wavy vortex flow (WVF), modulated vortex flow (MVF) as well as spiral vortex domains in a conical shaped gap. The resulting maps for the different flow states show the location of vortices in the annular gap between the inner and outer cylinder. Cylindrical and conical concentrically rotating inner bodies were applied and respective flow patterns were analyzed. The method uses a stroboscopic triggering to synchronize flow measurements and rotational motion. The oscillation frequency f of unsteady motion in WVF, MVF, and spirals can be obtained from the power spectrum of velocity. The UVP transducer was preferably positioned in radial direction, perpendicular to the surface of the inner rotating body for measuring the radial velocity component. At the same time, the transducer was moved with constant velocity vertically along the outer cylinder height. |
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| Keywords: | UVP flow mapping Stroboscopic effect Taylor-Couette flow Wavy vortex flow Spiral |
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