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Abstracts

I3.1

Statistics of quantum turbulence

Victor S. L’vov and Anna Pomyalov

Dept. of Chemical Physics, Weizmann Institute of Science, Rehovot 17600, Israel

Based on the current understanding of statistics of quantum turbulence in

4

He and

3

He as well as on the results of its ongoing analytical, numerical and experimental

studies, we discuss the following problems in the large-scale, space-homogeneous,

steady-state turbulence: Energy spectra of the normal and superfluid velocity

components; Cross-correlation function of the normal and superfluid velocities;

Energy dissipation by mutual friction and viscosity; Energy exchange between

the normal and superfluid components; High-order statistics and intermittency

effects. The statistical properties will be discussed for different types of turbulent

flows: coflow of

4

He; flow of

3

He-B with laminar normal fluid; pure superflow

and counterflow of

4

He.

I3.2

Quantum turbulence in

4

He studied using the SHREK facility

Yury Mukharsky(5), C. Baudet(1,2), M. Bon Mardion(3,4), P. Bonnay(3,4), F.

Chill`a(6), L. Chevillard(6), F. Daviaud(5), P. Diribarne(3,4), B. Dubrulle(5), D.

Faranda(5), B. Gallet(5), M. Gibert (7,8), A. Girard(3,4), J.M. Poncet(3,4), J.-P.

Moro(9), P.-E. Roche(7,8), B. Rousset(3,4), E. Rusaou¨en(7,8), J. Salort(6), E-W.

Saw(5), S. Nazarenko(10), A. Golov(11)(SHREK collaboration)

SHREK collaboration

1. Univ. Grenoble Alpes, LEGI, Grenoble, France

2. CNRS, LEGI, Grenoble, France

3. Univ. Grenoble Alpes, INAC-SBT, Grenoble, France

4. CEA, INAC-SBT, Grenoble, France

5. SPEC, CEA-CNRS, Universite Paris-Saclay

6. Laboratoire de Physique de l’ ´ENS de Lyon, CNRS/Universit´e Lyon, Lyon,

France

7. Univ. Grenoble Alpes, Institut NEEL, Grenoble, France

8. CNRS, Institut NEEL, Grenoble, France

9. CEA, DEN-DANS-DM2S-STMF-LIEFT, Grenoble, France

10. Warwick Uniwersity, Inst. of Mathematics, UK

11. Manchester University, School of Physics and Astronomy, UK.

We will present recent results from SHREK collaboration. Different sensors were

used to characterize the turbulence: hot wire anemometer, Pitot tubes, flexible

cantilever anemometer and second-sound absorption. The Pitot tubes have new

design which allows for potentially wider frequency range. I will also present a

novel noise-reduction method of spectral averaging. The method allows to average

down to zero almost all sources of sensor and preamplifier noise, including thermal

noise.

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