Abstract
We propose very general vortex nucleation mechanisms[1] analogous to a hydrodynamic instability and calculate associated critical velocity in agreement with experiments. The creation of vortices via extrinsic mechanism is driven by a formation of the surface vorticity sheet created by the flow, which reaches a critical size. Such a sheet screens an attraction of a half-vortex ring to the wall, the barrier for the vortex nucleation disappears and the vortex nucleation is started. In the intrinsic mechanism the creation of a big vortex ring, which transforms into the vortex, is driven by a fluctuative generation of small vortex rings.
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Work supported by NORDITA and Landau Institute
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Kusmartsev, F.V. Intrinsic and extrinsic vortex nucleation mechanisms in the flow. Czech J Phys 46 (Suppl 1), 31–32 (1996). https://doi.org/10.1007/BF02569431
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DOI: https://doi.org/10.1007/BF02569431