This article is cited in 16 papers

CONDENSED MATTER

The superfluid Reynolds number and the transition from potential flow to turbulence in superfluid $^4$He at mK temperatures

W. Schoepe

Physics Department, Regensburg University, D-93040 Regensburg, Germany

Abstract: This comment is on Phys. Rev. Lett. 144, 155302 (2015) by M. T. Reeves, T. P. Billam, B. P. Anderson, and A. S. Bradley “Identifying a superfluid Reynolds number via dynamical similarity” where a new superfluid Reynolds number is introduced. This definition is shown to be useful in the data analysis of the finite lifetime of turbulence observed with an oscillating sphere in superfluid helium at mK temperatures in a small velocity interval $\Delta v =(v-v_c)$ just above the critical velocity $v_c$. The very rapid increase of the lifetime with increasing superfluid Reynolds number is compared with the “supertransient” turbulence observed in classical pipe flow.

Received: 15.06.2015

Language: English

DOI: 10.7868/S0370274X15140088

 English version: Journal of Experimental and Theoretical Physics Letters, 2015, 102:2, 105–107

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