Instability on the Free Surface of Superfluid He-II Induced by a Steady Heat Flow in Bulk

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• 作者：I. A. Remizov ; A. A. Levchenko ; L. P. Mezhov-Deglin
• 关键词：Superfluid helium ; Heat flow ; Counterflow of normal and superfluid components ; Surface elevations ; Kelvin–Helmholtz instability on a free surface
• 刊名：Journal of Low Temperature Physics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：185
• 期：3-4
• 页码：324-338
• 全文大小：4,195 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Characterization and Evaluation Materials
  Magnetism and Magnetic Materials
  
• 出版者：Springer Netherlands
• ISSN：1573-7357
• 卷排序：185

文摘

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.