FLUID-TO-FLUID SCALING FOR A GRAVITY-DRIVEN AND FLASHING-DRIVEN NATURAL CIRCULATION LOOP

In certain natural-circulation reactor systems proposed recently, vapo r generation takes place by flashing in an adiabatic riser above the c ore. A step-by-step facility design procedure was used to define suita ble scaling criteria for a refrigerant-113 (R-113) experiment simulati ng the dynamics and stability of such a loop. The fact that vapor gene ration does not normally take place in the core allows additional flex ibility in designing the model; almost perfect simulation can be achie ved, mainly by reducing the height of the facility according to the li quid density ratio and scaling for similar void fraction distributions in the prototype and the model.