Decay of turbulence generated by spin-down to rest in superfluid 4He

Abstract

We report on the extension of the experiments (P. M. Walmsley et al., Phys. Rev. Lett. 99, 265302 (2007)) on the decay of quasiclassical turbulence generated by an impulsive spin-down from angular velocity Omega to rest of superfluid 4He in a cubic container at temperatures 0.15 K - 1.6 K. The density of quantized vortex lines L is measured by scattering negative ions. Following the spin-down, the maximal density of vortices is observed after time t ~ 10 Omega^-1. By observing the propagation of ions along the axis of the initial rotation, the transient dynamics of the turbulence spreading from the perimeter of the container into its central region is investigated. Nearly homogeneous turbulence develops after time t ~ 100 Omega^-1 and decays as L proportional to t^(-3/2). The effective kinematic viscosity in T=0 limit is nu = 0.003 kappa, where kappa=10^-3 cm^2 / s is the circulation quantum.

To be published in the Journal of Low Temperature Physics. 17 pages, 10 figures

References in corpus (5)

• Dissipation of Quantum Turbulence in the Zero Temperature Limit
• Bottleneck crossover between classical and quantum superfluid turbulence
• Quantum and quasiclassical types of superfluid turbulence
• Quantum turbulence in propagating superfluid vortex front
• Scanning Superfluid-Turbulence Cascade by Its Low-Temperature Cutoff

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• Mutual friction in superfluid ${}^3$He-B in the low-temperature regime
• Rotating quantum turbulence in superfluid 4He in the T=0 limit
• A compact rotating dilution refrigerator