Emergence of a periodic mode in the so-called turbulent region in a circular Couette flowReportar como inadecuado




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Abstract : The transition to turbulence is studied in normal fluid He contained between concentric cylinders with the inner cylinder rotating, for high Reynolds numbers R up to 500 Rc Rc is the critical Reynolds number for the Taylor instability and for small aspect ratios ΓΓ = l-d = fluid height-gap between cylinders. For sufficiently high values of d and in a range of R where the flow is considered as turbulent, a periodic mode appears and remains up to the maximum value of R. The T- and d-dependence of the mode has been studied. We suggest that this mode is related to a change in a boundary layers structure.

Keywords : Couette flow liquid helium 4 turbulence periodic mode turbulent region circular Couette flow transition of turbulence normal fluid He concentric cylinders high Reynolds numbers critical Reynolds number Taylor instability boundary layers structure





Autor: Bernard Perrin

Fuente: https://hal.archives-ouvertes.fr/



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