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Turbulent helium II flow is investigated in an annular gap of about 10 µm width and in superfilters with a pore size ≤0.1 µm. Of primary interest is the flow behavior at high mass flow rates. In the cases of both an annular gap and superfilters, deviations from the low-flow-rate behavior are found, which can be attributed to different reasons. Both systems with their separately determined characteristics are then combined in a parallel arrangement in order to study the flow in a channel system with nonuniform dimensions, as is realized, e.g., in a porous plug. The parallel system permits checks of different hypotheses on the flow behavior. The results show that certain simplistic ideas about the internal geometry of a porous plug are inadequate for the hydrodynamic treatment.
Journal of Low Temperature Physics – Springer Journals
Published: Nov 6, 2004
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