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Solitary Vortex Pairs in Viscoelastic Couette Flow
Phys. Rev. Lett. 78, 1460 – Published 24 February, 1997
DOI: https://doi.org/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 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 is suggested that the vortex flow is driven by the same forces that cause the Weissenberg effect.
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