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Subcooled flow boiling in a horizontal annular test section was investigated in a temperature-controlled experimental setup. The annular test section is installed as a part of the laboratory THELMA (Thermal Hydraulics experimental Laboratory for Multiphase Applications) built at Reactor Engineering Division of Jožef Stefan Institute. The unique characteristics of the temperature-controlled heating of the inner tube, in principle allow for a wide range of measurements, from subcooled boiling to the critical heat flux and above into the unstable film boiling regime. Transparent outer tube and a high-speed camera allow for visual investigation of two-phase boiling structures. In this study, first measurements of heat fluxes and visualization of flow boiling of refrigerant R245fa in horizontal annular configuration are presented and discussed.

Experimental investigation of subcooled flow boiling of R245fa in a narrow horizontal annular duct