dorsal/arxiv
View SchemaSolitary vortex couples in viscoelastic Couette flow
| Authors | Alexander Groisman, Victor Steinberg |
|---|---|
| Categories | |
| ArXiv ID | patt-sol/9610008 |
| URL | https://arxiv.org/abs/patt-sol/9610008 |
| DOI | 10.1103/PhysRevLett.78.1460 |
Abstract
We report experimental observation of a localized structure, which is of a new type for dissipative systems. It appears as a solitary vortex couple ("diwhirl") in Couette flow with highly elastic polymer solutions. A unique property of the diwhirls is that they are stationary, in contrast to the usual localized wave structures in both Hamiltonian and dissipative systems which are stabilized by wave dispersion. It is also a new object in fluid dynamics - a couple of vortices that build a single entity somewhat similar to a magnetic dipole. The diwhirls arise as a result of a purely elastic instability through a hysteretic transition at negligible Reynolds numbers. It is suggested that the vortex flow is driven by the same forces that cause the Weissenberg effect. The diwhirls have a striking asymmetry between the inflow and outflow, which is also an essential feature of the suggested elastic instability mechanism.
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"abstract": "We report experimental observation of a localized structure, which is of a\nnew type for dissipative systems. It appears as a solitary vortex couple\n(\"diwhirl\") in Couette flow with highly elastic polymer solutions. A unique\nproperty of the diwhirls is that they are stationary, in contrast to the usual\nlocalized wave structures in both Hamiltonian and dissipative systems which are\nstabilized by wave dispersion. It is also a new object in fluid dynamics - a\ncouple of vortices that build a single entity somewhat similar to a magnetic\ndipole. The diwhirls arise as a result of a purely elastic instability through\na hysteretic transition at negligible Reynolds numbers. It is suggested that\nthe vortex flow is driven by the same forces that cause the Weissenberg effect.\nThe diwhirls have a striking asymmetry between the inflow and outflow, which is\nalso an essential feature of the suggested elastic instability mechanism.",
"arxiv_id": "patt-sol/9610008",
"authors": [
"Alexander Groisman",
"Victor Steinberg"
],
"categories": [
"patt-sol",
"nlin.PS"
],
"doi": "10.1103/PhysRevLett.78.1460",
"title": "Solitary vortex couples in viscoelastic Couette flow",
"url": "https://arxiv.org/abs/patt-sol/9610008"
},
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