Vortex Shedding from an Object Moving in Superfluid ${}^4$He at mK Temperatures and in a Bose-Einstein Condensate

Abstract

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 $\omega \to 0$.

6 pages, 3 figures

References in corpus (1)

• Breakdown of Potential Flow to Turbulence around a Sphere Oscillating in Superfluid He-4 above the Critical Velocity

Cited by in corpus (2)

• The onset of nanoscale dissipation in superfluid He-4 at zero temperature: the role of vortex shedding and cavitation
• Vortex shedding from a microsphere oscillating in superfluid ^4He at mK temperatures and from a laser beam moving in a Bose-Einstein condensate