Abstract
It is important for superconducting rotors to maintain a stable flow pattern of liquid helium to prevent an accidental transition of superconducting field windings into the normal state. Liquid helium within the rotating helium pool of superconducting rotors has two major flow patterns. One is a gravity dominant flow pattern and the other is a centrifugal force dominant flow pattern. The former has a flat horizontal surface of a liquid, and on the other hand the latter has a cylindrical one. This paper describes the transition phenomena between these two flow patterns. The results of a visual experiment using water, fron 113 and silicon oil are presented in the first report of this paper.
