Abstract The potential reasons for the corium spreading difference over inert ceramic and reactive concrete channels of VULCANO VE-U7 experiment are investigated using Moving Particle Semi-implicit (MPS) method. A new thermal contact resistance model has been developed for MPS so that influence of the subscale heat transfer between the melt/crust and the substrate on spreading can be considered. The results indicate that the spreading difference is not much influenced by heat loss of the melt to different substrates, but more likely due to gas bubbles in the concrete channel. The most likely responsible gas bubble effect could not be well identified with the single channel analysis, because it could not consider the inflow mass interactions at the stabilization pool. The double-channel analysis with such consideration indicated enhancement of the effective thermal conductivity of the melt as the key influence of the gas bubbles that led to the difference.

中文翻译：

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VULCANO VE-U7实验中使用移动粒子半隐式方法研究陶瓷和混凝土基材上的真皮扩散

摘要 使用移动粒子半隐式（MPS）方法研究了VULCANO VE-U7实验中在惰性陶瓷和反应混凝土通道上的真皮扩散差异的潜在原因。已经为 MPS 开发了一种新的热接触电阻模型，以便可以考虑熔体/外壳和基材之间的亚尺度热传递对铺展的影响。结果表明，熔体对不同基材的热损失对铺展差异的影响不大，而更可能是由于混凝土通道中的气泡造成的。单通道分析无法很好地识别最可能的气泡效应，因为它无法考虑稳定池处的流入质量相互作用。