抄録
A vortex flow was generated by means of a stream of air bubbles released at the center of upper part of the rotating tank. The basic velocity measurements were made by photographing the motions of small marker particles and analysing time-exposure pictures.
It is obvious from these experimental results that the flow can be significantly influenced on the boundary conditions at both the top and bottom of the vortex. The vortex flow is confined to a cylindrical region which is composed of a spiral upward flow in the center surrounded by an annular downflow.
