Abstract
We study the scattering of first and second sound waves by quantum vorticity in superfluid Helium using two-fluid hydrodynamics. The vorticity of the superfluid component and the sound interact because of the nonlinear character of these equations. Explicit expressions for the scattered pressure and temperature are worked out in a first Born approximation, and care is exercised in delimiting the range of validity of the assumptions needed for this approximation to hold. An incident second sound wave will partly convert into first sound, and an incident first sound wave will partly convert into second sound. General considerations show that most incident first sound converts into second sound, but not the other way around. These considerations are validated using a vortex dipole as an explicitely worked out example.
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Coste, C., Lund, F. Scattering of first and second sound waves by quantum vorticity in superfluid helium. J Low Temp Phys 108, 441–459 (1997). https://doi.org/10.1007/BF02397684
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DOI: https://doi.org/10.1007/BF02397684