Solitary Vortex Pairs in Viscoelastic Couette Flow

  title={Solitary Vortex Pairs in Viscoelastic Couette Flow},
  author={Alex Groisman and Victor Steinberg},
  journal={Physical Review Letters},
We report experimental observation of a localized structure, which is of a new type for dissipative systems. It appears as a solitary vortex pair (``diwhirl'') in Couette flow with highly elastic polymer solutions. In contrast to the usual solitons the diwhirls are stationary. It is also a new object in fluid dynamics---a pair of vortices that build a single entity. The diwhirls arise as a result of a purely elastic instability through a hysteretic transition at negligible Reynolds numbers. It… 

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