非軸対称容器内の積層回転円盤による流れの解明

（粒子画像計測に基づく円盤領域の流れ挙動）

抄録

We report on the experimental study on the complex behavior of the fluid flow induced by a pair of coaxially rotating disks in a non-axisymmetric enclosure, which is commonly encountered in a hard disk drive. We focused mainly on the flow behavior in the disk region based on a series of measurements with particle image velocimetry. The experiment was carried out using refractive-index matched transparent model consists of a pair pf rotating disks with alternately inserted arms in a non-axisymmetric enclosure. The measurements were performed at four angles of the arm insertion on two observation planes at two Reynolds number conditions. Velocity vector fields parallel to the disk surfaces were obtained and we analyzed the circumferential and radial components of the flow velocities. Furthermore, differential parameters including vorticity and shear rate were calculated. The results reveal that the flow is largely influenced by the different angles of the arm insertion.