Abstract
We generate homogeneous turbulence using a moving grid within a stationary channel filled with superfluid helium. The root mean square vorticity is linked to the quantized line density, which we observe from second sound attenuation. This provides a simple, non-intrusive probe of the turbulent intensity. Results reveal how the time decay of turbulence depends upon the grid Reynolds number and the growth rate of the scale of energy containing eddies, demonstrating the value of Kolmogorov scaling arguments applied to turbulence in helium II. A semi-infinite turbulent region was also created, and we observed the propagation of the turbulent boundary into the adjacent quiescent fluid. Results suggest that the standard diffusive model for the propagation of turbulence may be incomplete.
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