Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........77m&link_type=abstract
Thesis (PH.D.)--THE UNIVERSITY OF WISCONSIN - MADISON, 1991.Source: Dissertation Abstracts International, Volume: 52-04, Sectio
Other
Heat Transfer, Liquid Helium
Scientific paper
The two-fluid model of He II allows for a number of flows. Specifically, pure super-flow, isothermal flow, zero-net-mass flow and independent flow. The Landau two -fluid equations of motion can be stretched and extended empirically to provide a model for the flow of He II in porous materials. Such a model is presented and compared to pressure and temperature measurements made across porous ceramics. The model is tested in an apparatus built specifically to achieve independent flow. This flow condition is accomplished by superimposing isothermal mass flow on the zero net mass flow condition of counterflow. Reasonable agreement between the model and the data is evident for each type of flow studied. However, two unexplained results persist. First, counterflow data, as well as some independent flow data, suggest that the counterflowing superfluid does not contribute to the pressure gradient. Second, The Gorter-Mellink constant is more than twice as large as smooth tube values and appears to be geometry dependent. These results suggest that further experimentation in porous materials is required.
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