Abstract
Translational motion of a large-scale vortex ring though He II is studied by applying the method of flow visualization. A vortex ring is generated by pushing a piston in He II. The resulting flow field can be visualized as streaks of neutrally buoyant hydrogen-deuterium solid particles as tracers. The ring formation and the development in the initial phase and the subsequent translational motion are investigated from sequential still pictures. The intrinsic feature of the superfluid turbulent flow in free space is discussed on the basis of the experimental results.
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