2420 静止-回転円盤間に発生する乱流斑点の挙動(S41-3 流体機械に関連した複雑内部流動の解析と計測(計測・CFD),S41 流体機械に関連した複雑内部流動の解析と計測)  [in Japanese] 2420 Behavior of Turbulent Spot in the Flow between Stationary and Rotating Disks  [in Japanese]

Flow between stationary and rotating disks, which is called as the tortional Couette flow, was investigated experimentally as a family of Couette flow including Taylor-Couette flow. Behavior of turbulent spot appearing in the flow was observed and its shape, similar to hose-shoe vortex appearing in the turbulent boundary layer, convection and disappearance were explained from the obtained images visualized by Kalliroscope flakes. Statistical analysis to determine the stability curve for the spot was performed based on visualized images. Using image analysis, the number of spot at each radius was counted as the number of black pixels for several rotating speed. Probability distribution for spot existing determined form the obtained number has similar form with the mathematical model constructed under some assumptions.