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Transactions of Visualization Society of Japan
The spiral vortex flows around a rotating sphere with smooth surface in still air were visualized by means of smoke-injection and smoke-wire method. The experiment was conducted at the rotating speed of the sphere with a diameter of 100mm at the range of 2280rpm. It was found that the air-jet flows spread from the equator of the sphere and the spiral vortex accompany with it. As the increasing rotating speed, the breakdown position of the vortex flows approached the sphere surface. Furthermore,doi:10.3154/jvs.23.supplement2_231 fatcat:mcy7qfh6ovb2dpwqhoktysvnbu