Characterizing He II flow through porous materials using counterflow data

Details Characterizing He II flow through porous materials using counterflow data Characterizing He II flow through porous materials using counterflow data

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sfhd.nasa.....m&link_type=abstract

In its Superfluid Helium Dynamics 8 p (SEE N92-11294 02-34)

Other

Cooling, Cryogenics, Liquid Helium, Porous Materials, Pressure Gradients, Temperature Gradients, Counterflow, Infrared Telescopes, Isothermal Flow, Porosity, Technology Utilization, Temperature Effects, X Ray Telescopes

Scientific paper

Proposed space applications, such as the cooling of infrared and x ray telescopes, have generated substantial interest in the behavior of He II flowing in porous materials. For design purposes, classical porous media correlations and room temperature data are often used to obtain order of magnitude estimates of expected pressure drops, while the attendant temperature differences are either ignored or estimated using smooth tube correlations. A more accurate alternative to this procedure is suggested by an empirical extension of the two fluid model. It is shown that four empirical parameters are necessary to describe the pressure and temperature differences induced by He II flow through a porous sample. The three parameters required to determine pressure differences are measured in counterflow and found to compare favorably with those for isothermal flow. The fourth parameter, the Gorter-Mellink constant, differs substantially from smooth tube values. It is concluded that parameter values determined from counterflow can be used to predict pressure and temperature differences in a variety of flows to an accuracy of about + or - 20 pct.

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