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Physical limitations of fountain effect pumps

โœ Scribed by U. Schmidtchen; H.-D. Denner

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
357 KB
Volume
27
Category
Article
ISSN
0011-2275

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โœฆ Synopsis

Turbulent He II flow behaviour in superfilters of non-cylindrical shape at large temperature gradients was investigated. It was found that the mass flow rates were always lower than those that would follow from a straightforward extrapolation of results obtained at small temperature gradients; under certain conditions they even went through maxima with respect to the temperature gradient. This is analogous to turbulent classical flow in comparable geometries. Such effects limit the performance of fountain effect pumps and must be taken into account in efficiency calculations.

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