Experimental Evidence of a Phase Transition in a Closed Turbulent Flow
Résumé
We experimentally study the susceptibility to symmetry breaking of a closed turbulent von Kármán swirling flow from Re=150 to Re=10^6. We report a divergence of this susceptibility at an intermediate Reynolds number Re=Re_\chi \simeq 90 000 which gives experimental evidence that such a highly space and time fluctuating system can undergo a ''phase transition". This transition is furthermore associated with a peak in the amplitude of fluctuations of the instantaneous flow symmetry corresponding to intermittencies between spontaneously symmetry breaking metastable states.
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