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

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 anal...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2015-08
Main Author: Schoepe, Wilfried
Format: Article
Language:English
Subjects:
Critical velocity
Data analysis
Fluid dynamics
Fluid flow
Fluids
Helium
Pipe flow
Potential flow
Reynolds number
Superfluidity
Turbulence
Turbulent flow
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1506.05003