Local investigation of superfluid turbulence

E-ISSN： 1286-4854|43|1|29-34

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.43, Iss.1, 2010-03, pp. : 29-34

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Abstract

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 $T_{\lambda}$, the sensor allows to measure the local velocity fluctuations, and below $T_{\lambda}$, it determines the local fluctuations of a linear combination of the normal and superfluid flow components. Above and below $T_{\lambda}$, 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 $T_{\lambda}$, the structure function exponents are found indistinguishable from those currently observed in normal fluid turbulence.