The viscous flow confined in a finite cylinder when one endwall disk and the sidewall are spinning about the central axis is studied. We examine the internal flow when a uniform axial suction through the spinning disk and a concomitant uniform radial inflow through the spinning sidewall are imposed. The rotational Reynolds number is large and the cylinder aspect ratio is 0(1). Finite-difference techniques are employed to integrate numerically the full Navier-Stokes equations. The core rotation rate, which is uniform in the axial direction, increases as the suction increases. Under a sufficiently strong suction, the core rotation rate exceeds that of the spinning disk. The flows in the core away from the sidewall are depicted well by the predictions of the infinite disk model. A physical description based on an angular momentum argument is given. Due to the presence of the sidewall, the angular velocities in finite configuration vary in the radial direction, and this variation is pronounced under a strong suction. The meridional flow patterns are displayed. When the suction is weak, the bulk of the meridional fluid transport from the sidewall to the spinning disk takes route via the boundary layer near the stationary disk. Under a strong suction, the meridional fluid transport through the main body of flow field increases. At small and moderate radii, the radial velocities nearly vanish in the core; the axial velocities increases in magnitude as the suction increases. When the suction is strong, the dynamic effects are concentrated in the Ekman layer near the spinning disk.
회전하는 원통용기내의 유체 유동은 그 주요한 운동량 전달 수단이 Secondary flow 이다. 본논문에서는 이와 같은 Secondary flow를 강력하게 활성화 시키는 조작을 통하여 물리적으로 유용한 결과를 얻고자 한다. Secondary flow의 활성화는 원통용기내의 흡입과 흡출에 의해 이루어 지며, 활성화의 정도는 흡출량의 조절을 통해 가능하다. 이와 같이 활성화된 Secondary flow는 원통용기내 비점성영역의 유체를 교란시켜 중국에 가서는 비점성 영역의 유체가 회전하고 있는 용기의 회전속도 보다 빨리 회전하는 결과를 보여준다. 이러한 결과들은 비점성영역의 각운동량 보존법칙에 의해 이해된다.
