Abstract
Since the classical investigation of the Taylor vortex by G. I. Taylor in 1923, many researchers have studied the Taylor vortex as one of the most important vortex types in flow. In this study, the inner cylinder is rotating, while the outer cylinder, which is concentric with the inner cylinder, is stationary. The phenomenon is visualized experimentally as a three-dimensional problem. In addition, the measurement of the velocity distribution is carried out by the PIV method. The radius of the inner cylinder is 20 mm, and that of the outer cylinder is 30 mm. The gap between the inner and outer cylinders is 10 mm. In this study, Re = 650 - 1200 is assumed. The aspect ratio Γ is defined as the ratio of cylinder height to gap distance. A servo motor to rotate the inner cylinder, a servo- motor control device, a servo amplifier for rotation speed control, and a YAG laser light source are installed in the apparatus. As tracer particles used in the PIV method, fluorescent particles with a size of 15 micro meters were used. The results of EFD and CFD are compared. The mode bifurcation is observed, and the flow structure is investigated. PIV and EFD results show good agreement quantitatively including extra vortices which are difficult to observe in PIV. This PIV system can analyze unsteady flows like Twin-cell mode, and it is useful to analyze time-dependent flow bifurcation.
