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 $\omega \to 0$.

arXiv comment6 pages, 3 figures

References in corpus (8)

• Evidence for a critical velocity in a Bose-Einstein condensed gas
• Observation of Superfluid Flow in a Bose-Einstein Condensed Gas
• Dissipation and Vortex Creation in Bose-Einstein Condensed Gases
• Periodic shedding of vortex dipoles from a moving penetrable obstacle in a Bose-Einstein condensate
• Probing superfluidity of Bose-Einstein condensates via laser stirring
• Nonlinear Dynamics in a Trapped Atomic Bose--Einstein Condensate Induced by an Oscillating Gaussian Potential
• Universal onset of quantum turbulence in oscillating flows and crossover to steady flows
• Breakdown of Potential Flow to Turbulence around a Sphere Oscillating in Superfluid He-4 above the Critical Velocity

Cited by in corpus (3)

• The onset of nanoscale dissipation in superfluid He-4 at zero temperature: the role of vortex shedding and cavitation
• On the Transition from Potential Flow to Turbulence Around a Microsphere Oscillating in Superfluid ^4He
• Vortex shedding from a microsphere oscillating in superfluid ^4He at mK temperatures and from a laser beam moving in a Bose-Einstein condensate