Abstract
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 −1, and 1.8 and 2 K, respectively. A full description of the flow was obtained by measuring mass flow rate, quality, void fraction, wetted surface and pressure losses by means of specific diagnostics. Results of measurements show two regions. For low gas velocities, thermo-hydraulic behaviour is fully described by a separated stratified two-phase flow model. For gas velocities higher than 4 m s −1 an increase in the wall heat exchange seems to indicate that liquid droplet entrainment occurs.
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