Abstract
In the design study of the large-scale sodium-cooled fast reactor in Japan (JSFR), gas entrainment (GE) phenomena have to be evaluated in terms of their occurrences because entrained bubbles in the primary cooling system may cause disturbances in reactor power. Therefore, the authors have developed a prediction method for the GE occurrences and obtained conservative criteria in terms of the GE onset conditions. However, in a reasonable JSFR design, a small amount of entrained gas may be allowed because there are always small deposition bubbles in the primary cooling system. In this case, not only the GE occurrences but also the amount of the entrained gas should be evaluated accurately. Therefore, the authors are studying the amount of the entrained gas by utilizing simple an experiment and a numerical simulation. In this paper, as a part of the validation of the numerical simulation method for the evaluation of the entrained gas flow rate, parametric simulations of the simple experiment are performed with a high-precision volume-of-fluid algorithm which simulate interfacial dynamic deformations directly. As a result, the simulation results gives larger entrained gas flow rate than the experimental data but the dependency of the entrained gas flow rate on the liquid flow rate is reproduced qualitatively.
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