Abstract
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 interfacial 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 1.
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