Instantaneous Three-Dimensional Vortex Structure and Heat Transfer of Turbulent Flow in Expanding Concentric Annular Flow-Passage with Rotating Inner-Wall

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Five flow passages of concave, convex, conical, cylindrical, and disk types were examined for their turbulence behavior. In these passages, multiple flow-instability factors can simultaneously affect the flow. Large Eddy Simulation (LES), Direct Numerical Simulation (DNS), and Particle Tracking Velocimetry (PTV) measurement were performed. The effects of through-flow Reynolds number, Taylor number, and geometry of flow passages on instantaneous three-dimensional vortex structure, turbulence statistics, and heat transfer coefficients were clarified.