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2 Phase transition in a Closed Turbulent Flow

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Phase Transition in a Closed Turbulent Flow

F. Daviaud1, P.-P. Cortet12, E. Herbert1, A. Chiffaudel1, & B. Dubrulle1

1 CEA, IRAMIS, SPEC, CNRS URA 2464, Groupe Instabilit´es & Turbulence, 91191 Gif-sur-Yvette, France

2 Present address : Laboratoire FAST, CNRS UMR 7608, Universit´e Paris-Sud, 91405 Orsay, France [email protected]

Using stereoscopic particle image velocimetry, we experimentally study the susceptibility to symme- try breaking of a closed turbulent von K´arm´an swirling flow from Re = 150 toRe '106. We report a divergence of this susceptibility at an intermediate Reynolds number Re = Reχ ' 40 000 which gives experimental evidence that such a highly space and time fluctuating system can undergo a “phase tran- sition”. This transition is furthermore associated with a peak in the amplitude of fluctuations of the instantaneous flow symmetry corresponding to intermittencies between spontaneously symmetry brea- king metastable states.

R´ ef´ erences

P.-P. Cortet, A. Chiffaudel, F. Daviaud, and B. Dubrulle, Phys. Rev. Lett.105, 214501 (2010)

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