Abstract
The results of experimental studies of heat transfer during boiling of sodium-potassium alloy in the presence of natural convection in model FA of a fast reactor with seven fuel-rod simulators are reported. The method of investigation is described. Data are obtained for three regimes of boiling of the liquid metal in FA: stable (nucleate), unstable (slug), and secondary stable (disperse-annular). The unstable boiling regime developed in two directions depending on the state of the surface of the simulators: in the presence of manufacturing roughness – in the direction of damping of pulsations, stabilization of boiling, and subsequent stable heat removal in the presence of a fi lm of liquid on the surface of the simulators (disperse-annular regime of boiling) or in the presence of small roughness – in the direction of increasing amplitude of flow and temperature pulsations. Data on an emergency regime with pressure reduction in the circulation loop, initial superheating upon boiling-up of the liquid metal, heat transfer, and a cartogram of the two-phase flow regimes of liquid metals are presented. The boundaries of the regimes are described by analytical expressions.
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