Mass transport by a vortex ring

Mass transport by a vortex ring in water has been studied experimentally A vortex ring with the Reynolds number in the vicinity of similar to 1 x 10(5 ) is launched in water by means of an exploding wire. Fine particles inject ed into a vortex ring at the outlet of vortex driver are carried away with vortex motion. Some particles spin out of the vortex motion and are left be hind a vortex ring. But many of them are trapped in a vortex ring and are c arried up to the end of water lank which is located at 1.4 m from the vorte x driver. Masu analyses of particles show that particles with specific grav ity of larger than unity are scattered out of a vortex ring due to a centri fugal force, but those with specific gravity being less than unity are trap ped in a vortex core and are carried for a long distance. The result indica tes that an efficient mass transport by a vortex ring is realized when the specific gravity of particles is less than that: of ambient. fluid that sup ports a vortex ring.