Visualization and measurement of jet breakup behavior using LIF
Visualization and measurement of jet breakup behavior using LIF
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使用 LIF 可视化和测量射流破碎行为
DOI：
10.1299/transjsme.15-00395
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Koyama
中科院分区：
文献类型：
--
作者：
Shimpei Saito;Y. Abe;K. Koyama
本文介绍了一个详细的实验研究，以了解在钠冷快堆堆芯破裂事故射流破碎的基本过程。研究主要集中在射流破碎和破碎行为的流体动力学相互作用。实验在不互溶的液-液体系中进行。两种液体的折射率相匹配，因此使用激光诱导荧光（LIF）可以清楚地看到射流的垂直平面。通过图像处理得到的射流破碎长度与现有的关联式进行了比较。从韦伯数和膜沸腾效应的角度讨论了射流破碎长度关联式的适用性。当Weber数为10 ~ 1000时，沸腾效应足够小，射流破碎长度可用Epstein关联式描述。最后，研究了射流核心直径的减小。实验结果表明，射流平均直径沿流动方向逐渐减小，但不是线性减小。
This paper presents a detailed experimental study to understand the fundamental process of jet breakup during a core disruptive accident of a sodium-cooled fast reactor. The study mainly focuses on hydrodynamic interaction of jet breakup and fragmentation behavior. The experiments were carried out in an immiscible liquid-liquid system. The indices of refraction in the two liquids were matched, so that the vertical plane of jet flow was clearly visualized using laser-induced fluorescence (LIF). The jet breakup length obtained by image processing is compared with the existing correlations. The applicability of the jet breakup length correlations is discussed from the viewpoints of Weber number and film-boiling effect. When the Weber number is from 10 to 1000, and the boiling effect is small enough, it is suggested that jet breakup length is described by Epstein’s correlation. Finally, the reduction of jet core diameter is investigated. It is shown, in this experiment, that the mean jet diameter reduces in the flow direction gradually, but it does not reduce linearly.