Turbulent velocity spectra in superfluid flows

Details Turbulent velocity spectra in superfluid flows Turbulent velocity spectra in superfluid flows

2012-02-03

arxiv.org/abs/1202.0643v1

Physics of Fluids : Phys. Fluids 22 (2010) 125102

Physics

Fluid Dynamics

13 pages, 9 figures

Scientific paper

10.1063/1.3504375

We present velocity spectra measured in three cryogenic liquid 4He steady flows: grid and wake flows in a pressurized wind tunnel capable of achieving mean velocities up to 5 m/s at temperatures above and below the superfluid transition, down to 1.7 K, and a "chunk" turbulence flow at 1.55 K, capable of sustaining mean superfluid velocities up to 1.3 m/s. Depending on the flows, the stagnation pressure probes used for anemometry are resolving from one to two decades of the inertial regime of the turbulent cascade. We do not find any evidence that the second order statistics of turbulence below the superfluid transition differ from the ones of classical turbulence, above the transition.

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