Effect of Macroscopic Parameters of Porous Material on Flow Characteristics for Superfluid Helium Thermomechanical Pump
Flow characteristics of superfluid helium (He II) through a porous material for a thennomechanical pump (TMP) are not ideal in effect at a practical working point in employment such as cooling systems of detectors and superconducting magnets in space. If the He II flow through a porous element of a TMP were in the ideal state, there would be no dependence on geometry of the element. But the actual situation is not. In such non-ideal situations, some macroscopic parameters of the material as well as the geometry of a TMP element play important roles in a limitation of superfluid helium flow through a TMP element. Penneability of the porous element of a TMP is considered especially to discuss the flow characteristics of He II through a TMP element.
KeywordsPermeability Entropy Porosity Mercury Helium
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