Affiliations: Fluid Mechanics Laboratory, Department of Mechanical
Engineering, Hosei University, Tokyo 184-8584, Japan. Tel: +81-42-387-6155;
E-mail: mizuki@fml.k.hosei.ac.jp | Fluid Mechanics Laboratory, Department of Applied
Mechanics, Indian Institute of Technology, Madras-600036, India
Abstract: Vortexing occurs during draining from tanks which reduces the rate
of outflow. The phenomenon is augmented by initial rotation. The use of a
vortex suppressor in a circular tank prevents vortexing. The reasons for the
suppression of the vortexing are not clear. In this paper quantitative flow
visualization results using PIV are presented which bring out the flow
structure under various conditions. The suppressor leads to a faster decay in
the rotational component.