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Viscosity measurements on liquid helium 4 by means of a torsional oscillator.

[In Japanese. / En japonais.]

Author(s) : FUJII Y., OGAWA T., TAKESAKO N., SHIGEMATSU T., NAKAMURA M., YAMAGUCHI M., SHIGI T.

Type of article: Article

Summary

The viscosity has been measured at temperatures between 1.5 and 2.7 K under saturated vapour pressure. The viscosity data derived from the resonant frequency difference between the empty cell and the cell filled with liquid helium 4 show satisfactory agreement with the results obtained by Welber. When the velocity of cell-wall exceeded the critical velocity below the superfluid transition temperature, the decrease of the resonant frequency caused by the growth of the quantized-vortex was observed. In the case of a cell with rough wall, the critical velocity was low compared with a cell with smooth wall. The rate of the growth of vortex line length also depends on the wall roughness.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1995-0009
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 29 - n. 3
  • Publication date: 1994
  • Document available for consultation in the library of the IIR headquarters only.

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