ISSN Online: 2377-424X
ISBN Print: 1-56032-797-9
International Heat Transfer Conference 11
NUMERICAL STUDY OF FLOW AND HEAT TRANSFER OF SUPERFLUID HELIUM IN CAPILLARY CHANNELS
摘要
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.