Flow Establishment Time of a Water Bath Contained in a Cylindrical Vessel Set in Sudden Rotation
A cylindrical reactor of material processing systems is sometimes rotated about its axis or an offset axis in order to enhance mixing and homogenize temperature and chemical compositions. As a simplified model for this kind of flow field, a water bath contained in a cylindrical vessel suddenly set in rotation about its axis was taken up. The flow establishment time of the water flow in the bath, defined as a period till the instantaneous tangential velocity component exceeded 95% of its final steady state value, was determined experimentally. Two different boundary conditions were imposed on the top part of the bath. One was covered with a flat circular disk and the other was free surface. The flow establishment time thus determined was correlated as a function of the angular frequency of rotation, the diameter and depth of the bath, and the kinematic viscosity of liquid. The existence of the top wall shortened the flow establishment time significantly.
- ISIJ international
ISIJ international 38(11), 1180-1184, 1998-11-15
The Iron and Steel Institute of Japan