Vortex Shedding from an Object Moving in Superfluid \(^4\)He at mK Temperatures and in a Bose-Einstein Condensate

Vortex shedding from a microsphere oscillating in superfluid \(^4\)He at mK temperatures is compared with that from a laser beam moving in a Bose-Einstein condensate (BEC) as observed by other authors. In particular, in either case a linear dependence of the shedding frequency \(f_v\) on \(\Delta v...

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Bibliographic Details
Published in:arXiv.org 2016-07
Main Author: Schoepe, Wilfried
Format: Article
Language:English
Subjects:
Condensates
Critical velocity
Dependence
Fluid dynamics
Fluids
Laser beams
Matter & antimatter
Superfluidity
Turbulent flow
Vortex shedding
Online Access:Get full text
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Summary:Vortex shedding from a microsphere oscillating in superfluid \(^4\)He at mK temperatures is compared with that from a laser beam moving in a Bose-Einstein condensate (BEC) as observed by other authors. In particular, in either case a linear dependence of the shedding frequency \(f_v\) on \(\Delta v = v - v_c\) is observed, where \(v\) is the velocity amplitude of the sphere or the constant velocity of the laser beam above a critical velocity \(v_c\) for the onset of turbulent flow: \(f_v = a \,\Delta v\), where the coefficient \(a\) is proportional to the oscillation frequency \( \omega \)above some characteristic frequency \(\omega_k\) and assumes a finite value for steady motion \(\omega \rightarrow 0\).
ISSN:2331-8422
DOI:10.48550/arxiv.1606.07919