${}^4$He Counterflow Differs Strongly from Classical Flows: Anisotropy on Small Scales

Abstract

Three-dimensional anisotropic turbulence in classical fluids tends towards isotropy and homogeneity with decreasing scales, allowing --eventually-- the abstract model of "isotropic homogeneous turbulence" to be relevant. We show here that the opposite is true for superfluid ${}^4$He turbulence in 3-dimensional counterflow channel geometry. This flow becomes less isotropic upon decreasing scales, becoming eventually quasi 2-dimensional. The physical reason for this unusual phenomenon is elucidated and supported by theory and simulations.

5 pages, 3 figures

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Cited by in corpus (12)

• Fully Coupled Two-Fluid Dynamics in Superfluid ${}^4$He: Anomalous Anisotropic Velocity Fluctuations in Counterflow
• Fluid dynamics on logarithmic lattices
• Inhomogeneous distribution of particles in co-flow and counterflow quantum turbulence
• Counterflow-Induced Inverse Energy Cascade in Three-Dimensional Superfluid Turbulence
• Superfluid turbulence driven by cylindrically symmetric thermal counterflow
• Strong anisotropy of superfluid ${}^4$He counterflow turbulence
• Coupled dynamics of quantized vortices and normal fluid in superfluid ${}^4$He based on lattice Boltzmann method
• A cryogenic-helium pipe flow facility with unique double-line molecular tagging velocimetry capability
• Disentangling temperature and Reynolds number effects in quantum turbulence
• Vinen's latest thoughts on the "bump'' puzzle in decaying He II counterflow turbulence
• Vortex Simulations on a 3-Sphere
• Theory of anisotropic superfluid He-4 counterflow turbulence