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, 35 Careful analysis of the critical regimes by torque measurements, to be reported elsewhere, has been performed with the annulus In a very narrow range 0.171 0.179, we observe very slow dynamical regimes where the topology changes back and forth along time over hours. This explains why, very close to c , some of the present measurements?acquired for only 10 min?may not appear to be of the expected topology in Fig
, 36 If regions of high level of turbulence due to shear still exist, they should be confined inside the blades of the slow rotating impeller
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