The critical velocity of transition to turbulence in .sup.3./sup.He-.sup.4./sup.He liquid solutions

0543584 - FZÚ 2022 RIV US eng J - Journal Article
Vrakina, V. A. - Rudavskii, E. Y. - Sokolov, S. S. - Chagovets, V. K. - Sheshin, G. A. - Chagovets, Tymofiy
The critical velocity of transition to turbulence in ³He-⁴He liquid solutions.
Low Temperature Physics. Roč. 46, č. 10 (2020), s. 971-976. ISSN 1063-777X. E-ISSN 1090-6517
Institutional support: RVO:68378271
Keywords : superfluid ³He solutions in ⁴He * quartz tuning fork * turbulence * critical velocity
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 0.923, year: 2020
Method of publishing: Limited access
https://doi.org/10.1063/10.0001906

The transition between laminar and turbulent flows around a quartz tuning fork vibrating with frequency omega in superfluid He-4 and concentrated solutions (5 and 15% He-3 in He-4) in the temperature range 0.3-2.3 K has been studied. The temperature dependences of the amplitude of the critical transition velocity v(cr) are obtained. The relationship v(cr) similar to root(eta omega/rho) is shown to be applicable for the description of these dependences in concentrated solutions of He-3 in He-4 with density rho and viscosity eta, but this formula does not hold for the temperature dependence of v(cr) in pure He-4 over the entire temperature range explored. It is also shown that in contrast to pure He-4 temperature has virtually no effect in concentrated He-3-He-4 solutions on the drag coefficient in both laminar and turbulent regimes.

Permanent Link: http://hdl.handle.net/11104/0320771