The pressurisation during the energetic fuel-coolant interaction is mainly governed by the significant increase of the melt-coolant surface area during the fine fragmentation process. Understanding the heat transfer processes between the fine fragments and the coolant seems to be crucial for the pressurization modelling. In the paper, the level of understanding of the pressurization process during the energetic fuel-sodium interaction is assessed and discussed.
COBISS.SI-ID: 31098407
The performed comprehensive parametric analysis, investigating the influence of various experimental conditions and the MC3D code jet breakup model parameters on the lateral premixture extension, revealed important features. The analysis confirmed the experimental X-ray data indications that the lateral premixture extension decreases with increasing water sub-cooling. It turned out that the lateral premixture extension is driven mainly by the amount of local produced vapour, as the emerging vapour pushes the water together with the melt droplets towards the tube wall. Thus the influence of an individual parameter on the lateral premixture extension is not straightforward.
COBISS.SI-ID: 30508583