Cross-linking of two vortex rings

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Abstract
The mechanism for cross‐linking two vortex rings has been investigated experimentally. Phase‐locked velocity measurements using x‐type hot wires were carried out point by point over the entire flow field, and time‐dependent vorticity fields were educed. It is found that a new pair of vortex tubes is created, which connects the interacting vortex rings and grows gradually, while the vorticity intensity of the main rings decreases. This is considered to be a type of bridging phenomenon of the vortex tubes, as proposed by Kida and Takaoka [Phys. Fluids 3 0, 2911 (1987)] in their numerical simulation.

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