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Viscoelastic Taylor-Couette instability as analog of the magnetorotational instability.

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Viscoelastic Taylor-Couette instability as analog of the magnetorotational instability.

Auteurs : Yang Bai [France] ; Olivier Crumeyrolle [France] ; Innocent Mutabazi [France]

Source :

Physical review. E, Statistical, nonlinear, and soft matter physics [ 1550-2376 ] ; 2015.

RBID : pubmed:26465414

Abstract

A linear stability analysis and an experimental study of a viscoelastic Taylor-Couette flow corotating in the Keplerian ratio allow us to elucidate the analogy between the viscoelastic instability and the magnetorotational instability (MRI). A generalized Rayleigh criterion allows us to determine the potentially unstable zone to pure-elasticity-driven perturbations. Experiments with a viscoelastic polymer solution yield four modes: one pure-elasticity mode and three elastorotational instability (ERI) modes that represent the MRI-analog modes. The destabilization by the polymer viscosity is evidenced for the ERI modes.

DOI: 10.1103/PhysRevE.92.031001
PubMed: 26465414

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Viscoelastic Taylor-Couette instability as analog of the magnetorotational instability.

Viscoelastic Taylor-Couette instability as analog of the magnetorotational instability.

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Abstract

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