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Numerical study of flow and heat transfer of superfluid helium in capillary channels

✍ Scribed by K. Takamatsu; N. Fujimoto; Y.F. Rao; K. Fukuda

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
722 KB
Volume
37
Category
Article
ISSN
0011-2275

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✦ Synopsis

A modified two-fluid model is adopted to study flow and heat transfer of superfluid helium in a microchannel with a diameter as small as that of a superleak in a fountain effect pump. Variable properties of superfluid helium and energy dissipations due to the two-fluid mutual friction and the friction at the channel wall are fully taken into consideration.

It is found that the normal fluid component flow is not trivial even in a channel with diameter of a micrometre, and that there exists an optimum diameter for the maximum mass flow rate. The flow of superfluid helium through a channel with different temperatures at the ends differs considerably from that of a Newtonian fluid. The strong dependence of the thermodynamic properties on temperature and pressure, as well as the internal-convection mechanism are found to be the causes of the unique flows.

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