Direct Measurement of the Critical Velocity Above Which a Tuning Fork Generates Turbulence in Superfluid Helium

作者：Efimov V B^*; Garg Deepak; Kolosov O; McClintock P V E

来源：Journal of Low Temperature Physics, 2010, 158(3-4): 456-461.

DOI：10.1007/s10909-009-0026-5

• Quantum fluid
• Quantum turbulence
• Tuning forks
• Superfluid helium
• Critical velocity

The dynamics of an electrically-driven 8 kHz quartz tuning fork has been studied experimentally in liquid helium-4 in the temperature range 1.3 < T < 4.2 K under the saturated vapour pressure. The fork has relatively large dimensions compared to standard 32 kHz fork used in recent investigations. The velocity of the tip of the fork prong is measured by the indirect electromechanical equivalent method and is compared with the velocity of another 8 kHz fork (from the same batch) determined by direct optical measurement of the oscillation amplitude through Michelson interferometry. A comparison of these results has provided absolute values for the critical velocity of the transition to the turbulent state.

• 出版日期2010-2