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Theoretical studies of the propagation of sound in narrow channels filled with helium II. I. The dispersion relations of fourth sound and of the fifth wave mode

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Abstract

The wave propagation in helium II bounded by two plane-parallel plates forming a narrow channel is considered. The theory is based on the complete linearized set of the Khalatnikov equations. These equations are exactly averaged over the width of the channel taking into account the boundary conditions and symmetry relations. It is shown that in narrow channels three solutions of these equations exist; (a) fourth sound, (b) the so-called fifth-wave mode, and (c) another wave mode, which is very strongly damped. The dispersion relations of these wave modes are calculated with regard to all kinetic coefficients and to the coefficient of thermal expansion. The phase velocities and absorption coefficients are also discussed in detail.

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Authors and Affiliations

  1. Institut für Physik der Universität Mainz, 65 Mainz, Germany

    H. Wiechert & L. Meinhold-Heerlein

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  1. H. Wiechert
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  2. L. Meinhold-Heerlein
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Wiechert, H., Meinhold-Heerlein, L. Theoretical studies of the propagation of sound in narrow channels filled with helium II. I. The dispersion relations of fourth sound and of the fifth wave mode. J Low Temp Phys 4, 273–288 (1971). https://doi.org/10.1007/BF00629714

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  • DOI: https://doi.org/10.1007/BF00629714

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