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Stratified two-phase superfluid helium flow: II

โœ Scribed by L. Grimaud; A. Gauthier; B. Rousset; J.M. Delhaye

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
578 KB
Volume
37
Category
Article
ISSN
0011-2275

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โœฆ Synopsis

This paper presents the physical basis of a one-dimensional two-fluid stratified flow model, adapted for adiabatic or diabatic superfluid helium flow. Closure relationships for wall shear stresses and inter-facial momentum transfer are used to predict the total pressure losses and the void fraction along the line. The numerical resolution is based on a finite difference scheme. The influence of each term in the momentum equations is discussed. Finally, the model has been verified through comparisons with available experimental data'.

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Experiments were conducted with saturated superfluid helium. Two-phase co-current stratified flow was circulated through a 40 mm inner diameter, 86 m long heated tube, with a slope of 1.4%. Mass flow rates and temperatures ranged between 1.5 and 6.3 g s-l, and 1.8 and 2 K, respectively. A full descr

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pressure, to reach temperatures higher than 4.2 K. As was expected from Fig. la, the original data for the range from 2.25 to 5 K was found to be correct. However, data below the X-point (2.17 K) differed drastically in the two calibrations. The supplier could not explain this discrepancy, and the s