Abstract
The entrainment and transport of air bubbles by a vortex ring are experimentally investigated.A vortex ring launcher,composed of a cylinder and a piston,is mounted on the bottom of a water tank.Air bubbles are injected from a needle,which is attached on the cylinder surface,into the vortex ring.The bubble motions relative to the vortex ring are found to be classified according to the strength of the vortex ring and the bubble flow rate.When the strength of the vortex ring is low,the bubbles are less affected by the vortex ring.With increasing the strength,the bubbles are favorably entrained into the vortex core and transported by the convection of the vortex ring.
