Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983alab.reptq....m&link_type=abstract
In Alabama Univ. Res. Rept.: 1983 NASA/ASEE Summer Faculty Fellowship Program 20 p (SEE N84-16022 06-80)
Astronomy and Astrophysics
Astronomy
Cryogenics, Helium, Infrared Astronomy, Mass Flow, Plugs, Porosity, Superfluidity, Laminar Flow, Permeability, Sintering, Thermal Conductivity
Scientific paper
As a background for the study of the nature of superfluid helium flow through porous plugs for other space science uses, preliminary tests on various plugs of a given material, diameter, height, and filtration grade have been performed. Two characteristics of the plugs, pore size and number of channels, have been determined by the bubble test and warm flow test of helium gas through the plugs, respectively. Tests on the flow of He II through the plugs have also been performed. An obvious feature of the results of these tests is that for isothermal measurements of pressure versus mass flow rate below approximately 2.10 K, the flow is separated into two different regimes, indicative of the occurrence of a critical phenomenon.
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