Characteristics of heat transfer of models of core and steam generator surfaces with regulation of impurity content in a loop with lead coolant

The results of experimental investigations of the heat transfer by lead coolant in the ring-shaped gaps of a circulation loop during monitored and controlled mass transfer and mass exchange of oxygen and impurity are presented. The investigations were performed in a loop with circulation of lead coolant at temperature of 450–550°C, average velocity 0.1–1.5 m/sec, Peclet number 500–6000, and heat flux 50–160 kW/m². The oxygen content in the loop was varied from the value for thermodynamic activity 10⁻⁵–10⁰ to saturation and above with formation of lead oxide deposits on the heat transfer surface. The processes in a non-isothermal liquid metal loop with heating (core) and cooling (steam generator) experimental sections simulate the dependence of the heat transfer characteristics in the loop on the impurity mass transfer. __________ Translated from Atomnaya énergiya, Vol. 104, No. 2, pp. 74–80, February, 2008.