Modeling Superfluid Phase Separator Systems
This report describes a model for the operation of superfluid helium (He II) phase separator systems. It is applied to the design of vent systems in low gravity. We used a systems approach to show the interactions of the various components of the vent system. Some of the assumptions and approximations that have been used in previous models are incorrect or inaccurate; thus, the equations used here differ somewhat from other reported models. We modeled the flow of He II with the one-dimensional steady-state Gorter-Mellink equations. The model includes several physical phenomena not found in other published analyses: the pressure jump at a gas-liquid interface due to evaporation; heat flow in the porous matrix; property variations due to temperature; and the internal structure of the porous material. When property variations and/or channel geometry are considered, the equations have to be solved as differential equations We modified the code SUPERFLOW to implement this model.
KeywordsFriction Factor Heat Load Property Variation Porous Matrix Pressure Jump
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