Hanninen, R. and Schoepe, W. (2011) Dynamical Scaling of the Critical Velocity for the Onset of Turbulence in Oscillatory Superflows. JOURNAL OF LOW TEMPERATURE PHYSICS, 164 (1-2). pp. 1-4. ISSN 0022-2291,
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The critical velocity v(c) for the onset of turbulence in oscillatory flows of superfluid helium is known to depend on the oscillation frequency., namely v(c) similar to root kappa omega where kappa is the circulation quantum. Only the numerical prefactor may have some geometry dependence. This universal behaviour was described earlier qualitatively either by employing the superfluid Reynolds number or by extending known dc vortex dynamics to ac flow. In our present work we emphasize that v(c)(omega) proportional to root omega can also be derived rigorously by means of dynamical scaling of equations of vortex dynamics as pointed out by Kotsubo and Swift already two decades ago.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VORTEX TURBULENCE; HELIUM-II; HE-4; SOUND; Critical velocity; Quantum turbulence; Oscillatory flow; Scaling |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Prof. Wilfried Schoepe |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Jun 2020 10:32 |
| Last Modified: | 08 Jun 2020 10:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20580 |
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