Generation of a Vortex Ring with High Reynolds Number by an Exploding Wire in Water

概要

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A method is presented for generating a vortex ring in water boy an exploding wire installed in a metal pipe. As a vapor bubble accompanied by wire explosion grows, water starts to flow with a high speed resulting in a formation of a vortex ring at the outlet of the pipe. The growth speed of a vapor bubble by the exploding wire in water is measured as 10〜20 m/s, in consistent with measurements of the translational velocity, 4〜5 m/s, of vortex ring and the rotational velocity, about 10 m/s, of fluid at the edge of vortex core. The Reynolds number based on the diameter of orifice, the velocity of vortex ring and the kinematic viscosity reaches the order of 10^5. The magnitude of vorticity and the circulation are in the order of 10^3/s and 10^<-1> m^2/s. These values are larger by about 10 times than those reported previously.
社団法人日本物理学会の論文
1995-10-15