Numerical Simulation of Cavitating Flow of Liquid Helium in a Vertical Converging-Diverging Nozzle

The basic characteristics of the two-dimensional cavitating flow of liquid helium through a vertical converging-diverging nozzle near the lambda point are numerically investigated to realize the further development and high performance of new multiphase He II cooling systems. First, the governing eq...

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Bibliographic Details
Main Authors: Ishimoto, J, Kamijo, K
Format: Conference Proceeding
Language:English
Subjects:
CAVITATION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPUTERIZED SIMULATION
COOLING SYSTEMS
CURVILINEAR COORDINATES
EQUATIONS
EVAPORATION
FLUID MECHANICS
HELIUM I
HELIUM II
LAMBDA POINT
MULTIPHASE FLOW
NOZZLES
SUPERFLUIDITY
TWO-DIMENSIONAL CALCULATIONS
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Summary:The basic characteristics of the two-dimensional cavitating flow of liquid helium through a vertical converging-diverging nozzle near the lambda point are numerically investigated to realize the further development and high performance of new multiphase He II cooling systems. First, the governing equations of the cavitating flow of liquid helium based on the unsteady thermal nonequilibrium multi-fluid model with generalized curvilinear coordinates system are presented, and several multiphase flow characteristics are numerically calculated, taking into account the effect of superfluidity. Based on the numerical results, the two-dimensional structure of the cavitating flow of liquid helium though a vertical converging-diverging nozzle is shown in detail, and it is also found that the generation of superfluid counterflow against normal fluid flow based on the thermomechanical effect is conspicuous in the large gas phase volume fraction region where the liquid to gas phase change actively occurs. Furthermore, it is clarified that the mechanism of the He I to He II phase transition caused by the temperature decrease is due to the deprivation of latent heat for vaporization from the liquid phase.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1774790