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General flow characteristics and flow rate evaluation on the basis of the effective flow passage model for helium II flow through a fountain pump element.

[In Japanese. / En japonais.]

Author(s) : MURAKAMI M., HANYU T., SEO K.

Type of article: Article

Summary

Two types of elements, compressed alumina powder elements and SUS fiber elements, were tested in a systematic way. The ideal and superfluid turbulent states are found to exist according to the magnitude of heat input. The effective flow passage model is proposed, in which the tortuosity is introduced to take account of the winding of micro flow passages in an element. The model leads to firm understanding of general flow characteristics. However, the tortuosity experimentally obtained with the alumina elements was considered to be too large (4 to 5). On the other hand, those of SUS elements are found to be one or nearly one as expected from the interior structure. It is concluded that the flow rate degradation in the superfluid turbulent state is resulted mostly from the winding effect of passages, and that the model is confirmed to be quite valid.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1994-0722
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 28 - n. 2
  • Publication date: 1993
  • Document available for consultation in the library of the IIR headquarters only.

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