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See detailA New State of Turbulence: Elasto-Inertial Turbulence
Dubief, Yves; Samanta, Devranjan; Holzner, Markus et al

Conference (2012, November 20)

The elasticity of polymer solutions is found to generate a new state of turbulence, elasto-inertial turbulence (EIT), characterized by an interplay between elastic and flow instabilities. Experiments and ... [more ▼]

The elasticity of polymer solutions is found to generate a new state of turbulence, elasto-inertial turbulence (EIT), characterized by an interplay between elastic and flow instabilities. Experiments and direct numerical simulations (DNS) in pipe and channel flows demonstrate the emergence of EIT at Reynolds numbers much lower than the critical Reynolds number for transition to turbulence in Newtonian flows. EIT causes the friction factor to deviate from the laminar solution and subsequently transition to the maximum drag reduction asymptote around Re=1800. EIT is a self-sustained mechanism that arises from the interactions between fluctuations of extensional viscosity, velocity and pressure. The polymer solution elasticity controls the growth of flow instability, resulting in transitional-like flows at high Reynolds numbers. The existence of EIT is not limited to pipe, channel or boundary layer flows, and evidence of EIT will be discussed in other flows, including natural convection using DNS. [less ▲]

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See detailbouncing of polymeric droplets on liquid interfaces
gier, stephan; Dorbolo, Stéphane ULg; Terwagne, Denis ULg et al

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2012), 86

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