  A conceptual model for targeted particle delivery is proposed using
controlled vortex ring reconnection. Entrained particles can be efficiently
transported within the core of the vortex ring which is propelled via
self-induction. A pair of these particle-transporting vortices travelling in
the streamwise direction along parallel trajectories will mutually interact
resulting in vortex reconnection. The reconnection causes a topological change
to the vortex rings which is accompanied by a rapid repulsion in a
perpendicular plane to the direction of travel; effectively, transporting the
particles to the desired delivery site on the sidewalls. This work explains the
physics of the process and the considerations for targeted delivery.
