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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

NUMERICAL STUDY OF FLOW AND HEAT TRANSFER OF SUPERFLUID HELIUM IN CAPILLARY CHANNELS

K. Takamatsu
Interdisciplinary Graduate School of Engineering Sciences Kyushu University 39 Kasuga 816 Japan

Noboru Fujimoto
Department of Nuclear Engineering Kyushu University Fukuoka, 812-8581 Japan

Yan F. Rao
Department of Nuclear Engineering Kyushu University Fukuoka, 812-8581 Japan

K. Fukuda
Department of Nuclear Engineering Kyushu University Fukuoka, Japan 812

Abstract

A modified two-fluid model is adopted to study flow and heat transfer of superfluid helium in a micro channel 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 normalfLuid component flow is not trivial even in a channel of a diameter of micro meter, 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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