Abstract
We generalize the analysis of second sound nonlinear waves to include the case in which a turbulent tangle of superfluid vortices is present in the flow. In the limit of weakly nonlinear perturbations the analysis reduces to examining the effect of friction arising from a given vortex tangle on a propagating wave, so that the considered model describes temperature waves propagating in a background of constant quantized vorticity. The obtained analytical solution yields a simple criterion showing that a localized disturbance develops into the temperature discontinuity provided the gradient of the initial disturbance exceeds a critical value; the latter is found as a function of temperature and superfluid vortex line density.
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Sergeev, Y.A., Barenghi, C.F. Interaction of Weakly Nonlinear Second Sound Waves with a Vortex Tangle in Helium II. Journal of Low Temperature Physics 127, 203–214 (2002). https://doi.org/10.1023/A:1015226202501
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DOI: https://doi.org/10.1023/A:1015226202501