抄録
In a study of a flow caused by a rotating disk in a casing, as for many of past studies, most of the form of a rotating disk is not considered. However, it became clear by a study of late years that a gap of a radius direction affected a flow between a casing base and rotating disks greatly. In this study, we used 7 different rotating disks and changed size of a gap in a cylinder casing and tested it about the influence that a radius direction gap gave to a flow near the fixed disk. As a result, it has been observed that "bead-like vortex" is generated in one of seven disks. "Bead-like vortex" is investigated in detail and the result of the experiment is shown in this paper.
