Abstract
We report observations of the onset of irregular motion on a free surface of superfluid He-II induced by a quasi-stationary heat flow in a rectangular container. The container open from the top is mounted inside an optical cell partly filled with superfluid He-II. Three holes in the container walls provide free circulation of the normal and superfluid components inside and outside the container. The results of measurements are discussed in terms of the Korshunov theory (Eurphys Lett 16:673, 1991; JETP Lett 75:423, 2002) of the Kelvin–Helmholtz instability on an initially flat He-II surface induced by a relative motion of superfluid and normal components of the liquid along the surface when the counterflow velocity exceeds the threshold value. The experimental data are qualitatively consistent with the theoretical predictions (Korshunov in JETP Lett 75:423, 2002) taking into account the finite viscosity of He-II.
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Acknowledgments
The fruitful discussions with I.M. Khalatnikov, G.V. Kolmakov, E. A. Kuznetsov, V.V. Lebedev and I.V. Kolokolov are gratefully acknowledged. The work was supported by the Russian Science Foundation, Grant No. 14-22-00259.
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It is our great honour and a great pleasure to submit our paper to the special issue of JLTP dedicated to Prof. Horst Meyer. One of us (L.P. M-D.) has known him since the beginning of 1970s , and we had multiple opportunities to converse with him on a number of topics like quantum diffusion of point defects in quantum crystals, gravity-driven convection in near-critical fluids with different heating, and many others, at a number of low temperature conferences in USA, Russia, Ukraine and Kazakhstan. We also had relatively frequent communications through long years, which sometimes included his visits to the last three countries, and these communications are our unforgettable remembrance.
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Remizov, I.A., Levchenko, A.A. & Mezhov-Deglin, L.P. Instability on the Free Surface of Superfluid He-II Induced by a Steady Heat Flow in Bulk. J Low Temp Phys 185, 324–338 (2016). https://doi.org/10.1007/s10909-016-1638-1
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DOI: https://doi.org/10.1007/s10909-016-1638-1