TY - JOUR
T1 - On the investigation of properties of superfluid 4He turbulence using a hot-wire signal
AU - Diribarne, Pantxo
AU - Bon Mardion, M
AU - Girard, A
AU - Moro, J.-P
AU - Rousset, B
AU - Chilla, F
AU - Salort, J
AU - Braslau, A
AU - Daviaud, F
AU - Dubrulle, B
AU - Gallet, B
AU - Moukharski, I
AU - Saw, E.-W
AU - Baudet, C
AU - Gibert, Mathieu
AU - Roche, Philippe-E
AU - Rusaouen, E
AU - Golov, Andrei
AU - Lvov, Victor
AU - Nazarenko, Sergey
PY - 2021/9/8
Y1 - 2021/9/8
N2 - We report hot-wire measurements performed in two very different, co-and counter-rotating flows, in normal and superfluid helium at 1.6 K, 2 K, and 2.3 K. As recently reported, the power spectrum of the hot-wire signal in superfluid flows exhibits a significant bump at high frequency [Diribarne et al., Phys. Rev. B 103, 144509 (2021)]. We confirm that the bump frequency does not depend significantly on the temperature and further extend the previous analysis of the velocity dependence of the bump, over more than one decade of velocity. The main result is that the bump frequency depends on the turbulence intensity of the flow, and that using the turbulent Reynolds number rather than the velocity as a control parameter collapses results from both co-and counter-rotating flows. The vortex shedding model previously proposed, in its current form, does not account for this observation. This suggests that the physical origin of the bump is related to the small scale turbulence properties of the flow. We finally propose some qualitative physical mechanism by which the smallest structures of the flow, at intervortex distance, could affect the heat flux of the hot-wire.
AB - We report hot-wire measurements performed in two very different, co-and counter-rotating flows, in normal and superfluid helium at 1.6 K, 2 K, and 2.3 K. As recently reported, the power spectrum of the hot-wire signal in superfluid flows exhibits a significant bump at high frequency [Diribarne et al., Phys. Rev. B 103, 144509 (2021)]. We confirm that the bump frequency does not depend significantly on the temperature and further extend the previous analysis of the velocity dependence of the bump, over more than one decade of velocity. The main result is that the bump frequency depends on the turbulence intensity of the flow, and that using the turbulent Reynolds number rather than the velocity as a control parameter collapses results from both co-and counter-rotating flows. The vortex shedding model previously proposed, in its current form, does not account for this observation. This suggests that the physical origin of the bump is related to the small scale turbulence properties of the flow. We finally propose some qualitative physical mechanism by which the smallest structures of the flow, at intervortex distance, could affect the heat flux of the hot-wire.
U2 - 10.1103/PhysRevFluids.6.094601
DO - 10.1103/PhysRevFluids.6.094601
M3 - Article
SN - 2469-990X
VL - 6
JO - Physical Review Fluids
JF - Physical Review Fluids
IS - 9
M1 - 094601
ER -