Final report on fluid dynamics of supercritical helium within cable-in-conduit conductors Page: 4 of 9
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variation, which encouraged measurements on a variety of samples of different
To attempt a correlation of pressure drop in CIC conductors, we obtained from'
LLNL nine samples of varying geometry. Pressure drop measurements on five of these
samples were reported at the 1990 Applied Superconductivity Conference2. The
samples studied had variable void fraction (36 to 54%), strand diameter (0.4 to 1 mm)
and cabling pattern. Pressure drop measurements were carried out between 18 and 5
K at supercritical pressures. Again the results obtained lead to some surprises. The
most notable of these was a calculate dfriction factor in the turbulent regime which was
below that predicted by the Blausius correlation for the measured hydraulic diameter.
The spread of the measured friction factors was not as large as reported previously, but
we attribute that to the more similar design to the conductors. For example, all
conductors contained the same number of strands. We also observed a significant
temperature dependence to the deri ed friction factor. This result may be attributable
to the variation of fluid properties provided ordinary Reynolds number scaling is
insufficient to correlate the friction actor.
In an effort to understand the results obtained through our experimental
program and provide data for design purposes, we developed a new model of the flow
pressure drop in the CIC conductor The main assumption of this model is to treat the
contained cable as a type of porou's.media consisting of a distribution of pore sizes
within the conduit. This pore size distribution is interpreted as a bundle of channels,
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Van Sciver, S.W. Final report on fluid dynamics of supercritical helium within cable-in-conduit conductors, report, July 1, 1992; Madison, Wisconsin. (digital.library.unt.edu/ark:/67531/metadc716815/m1/4/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.