Local investigation of superfluid turbulence
Laboratoire de Physique Statistique, Ecole Normale Supérieure,
24 rue Lhomond, 75231 Paris, France
Accepted: 8 May 1998
We investigate flows of helium IV driven by two counter-rotating disks, in a range of temperatures varying between 1.4 and 2.3 K. The local pressure fluctuations obtained on a small total-head tube are analyzed. Above , the sensor allows to measure the local velocity fluctuations, and below , it determines the local fluctuations of a linear combination of the normal and superfluid flow components. Above and below , Kolmogorov spectra are clearly obtained, with similar Kolmogorov constants. Evidence for persistence of inertial range intermittency in the superfluid region is presented. At all temperatures below , the structure function exponents are found indistinguishable from those currently observed in normal fluid turbulence.
PACS: 47.27.Gs – Isotropic turbulence; homogeneous turbulence / 47.27.Jv – High-Reynolds-number turbulence
© EDP Sciences, 1998