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Elastic turbulence in a dilute polymers solutions: physical origins, main features, applications in transport phenomena

[ vendredi 19-09-2014 16:30 | français ]Elastic turbulence in a dilute polymers solutions: physical origins, main features, applications in transport phenomena Teo Burghelea Laboratoire de Thermocinétique (UMR 6607), Nantes
Résumé :
The talk will review the main features of the elastic turbulence as well as it's ability to efficiently transport mass and heat within a fluid at vanishingly small Reynolds numbers. In the first part of the talk I will introduce the phenomenon of elastic turbulence (Groisman and Steinberg, Nature 2000) by describing the source of non linearity that triggers it, by comparing it to its inertial counterpart with a particular focus on several of its main features: flow resistance, increased level of fluctuations, spatial smoothness (T. Burghelea, E. Segre and V. Steinberg, Phys. Fluids, 2007), and Lagrangian chaotic behaviour (T. Burghelea, E. Segre and V. Steinberg, EuroPhys. Lett. 2004). The second part of the talk will be geared towards the experimental characterisation of the decay regime of mixing of a passive scalar by the elastic turbulence (T. Burghelea, E. Segre and V. Steinberg, Phys. Rev. E 2004, Phys. Rev. Lett. 2004). Finally, I will present part of our very recent experimental results on the efficiency of heat transfer in a regime of elastic turbulence (B. Traore, C. Castelain, T. Burghelea - submitted to JNNFM). The talk will close with a summary of the main points regarding the elastic turbulence and a discussion of several future directions perhaps worth being pursued.