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Intrinsic and extrinsic vortex nucleation mechanisms in the flow | F.V. Kusmartsev
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1 Jun 1996 | Subject: | cond-mat | Affiliation: | NORDITA, Copenhagen, Denmark and Department of Physics, Loughboro’ University Loughboro’, Leicestershire, UK | Abstract: | We propose very general vortex nucleation mechanisms 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 | Source: | arXiv, cond-mat/9605201 | Services: | Forum | Review | PDF | Favorites |
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