Particuate debris formation by breakup of melt jets: Main objectives and solution perspectives

摘要

In the present editorial article, questions about modeling of melt breakup are emphasized which seem not yet to be finally solved in the contributions to the present issue. These questions concern the basic instability and stripping approaches as well as the determination of the decisive fluid flow along the jet and thus the feedback of breakup with the produced mixture. Concerning the validation, understanding of material influences is emphasized by evaluations about jet lengths and diameter relations for FARO and PREMIX experiments. Evaluations on the formation of particulate debris require to consider breakup as well as crust formation on resulting drops of melt depending on the mixture properties, especially the steam content in the mixture. Sufficient breakup as well as quenching appear only to be possible with not too high steam contents in the mixture. A simplified modeling is envisaged, adapted to experimental results which nevertheless captures the major effects over a sufficient bandwidth of conditions.