Drop-generated vortex rings
Abstract
When a drop impacts onto a pool of liquid, at low Weber numbers, a robust vortex ring is generated. We use PIV and high-speed video to study the details of this well-known phenomenon. We focus on quantifying the strength of the vorticity and its interaction with the impact crater. The strength of the vortex ring is strongly dependent on the oscillation phase of the drop at first contact, which is studied over a range of impact heights. The vortex ring deforms the crater into a hammer shape and induces opposite sign vorticity at the free surface. We have also identified particular impact conditions where two vortex rings are formed.
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- November 2004
- Bibcode:
- 2004APS..DFD.NB007T