Interfacial area concentration in gas-liquid metal two-phase flow
Interfacial area concentration in gas-liquid metal two-phase flow
复制标题
DOI：
10.1007/s42757-021-0110-x
复制
发表时间：
2021-08
期刊：
影响因子：
--
通讯作者：
Xiuzhong Shen;Toshihiro Yamamoto;Xu Han;T. Hibiki
中科院分区：
文献类型：
--
作者：
Xiuzhong Shen;Toshihiro Yamamoto;Xu Han;T. Hibiki
气体和重液态金属两相流的流动特征表征和建模是下一代核反应堆系统发展的需要。本研究回顾了以往在气液金属两相流动中进行的实验研究，收集了垂直环形流道中N2-Pb/Bi（氮和铅/铋共晶合金）两相流动的空洞分数和界面面积浓度（IAC）数据库。为了获得气液金属两相流的流动特性，将N2-Pb/Bi两相流的实验数据与空气-水两相流的实验数据进行了比较。N2-Pb/Bi两相流中沿高度（即流动方向）的空隙率梯度和气泡直径均远大于空气-水两相流。这两种独特的流动特性可以分别用Pb/Bi共晶合金在N2-Pb/Bi两相流动中的大密度和表面张力来解释。本研究还回顾了已有的IAC相关性，发现到目前为止还没有建立气液金属两相流的IAC相关性。因此，收集了空气和蒸汽-水两相流的主要IAC相关性，并与收集到的N2-Pb/Bi两相流的实验数据进行了比较。对比表明，这些IAC相关性不能对N2-Pb/Bi两相流的实验数据给出可靠的预测。因此，基于N2-Pb/Bi两相流的实验数据，考虑两相的性质和流动特性，建立了一种新的IAC相关性。新建立的IAC相关性能较好地预测N2-Pb/Bi两相流的实验数据，平均相对误差为0.0609。
The characterization and modelling of the flow features in gas and heavy liquid metal two-phase flow are required for the development of next generation nuclear reactor systems. In this study, the past experimental studies performed in the gas-liquid metal two-phase flow are reviewed, and the void fraction and interfacial area concentration (IAC) database taken in the N2-Pb/Bi (nitrogen and lead/bismuth eutectic alloy) two-phase flow in a vertical circular flow channel are collected. In order to obtain the flow characteristics of the gas-liquid metal two-phase flow, the experimental data of the N2-Pb/Bi two-phase flow are compared with experimental data of the air-water two-phase flow. The void fraction gradient along the height (namely the flow direction) and the bubble diameter in the N2-Pb/Bi two-phase flow are found to be much larger than those in the air-water two-phase flow. These two unique flow characteristics can be explained, respectively, by the large density and surface tension of the Pb/Bi eutectic alloy in the N2-Pb/Bi two-phase flow. This study also reviewed the available IAC correlations and found that so far no IAC correlation has been developed for the gas-liquid metal two-phase flow. So, the available major IAC correlations for air- and steam-water two-phase flows are collected and compared with the collected experimental data of the N2-Pb/Bi two-phase flow. The comparison shows that these IAC correlations cannot give reliable predictions for the experimental data of the N2-Pb/Bi two-phase flow. So, a new IAC correlation has been developed based on the experimental data of the N2-Pb/Bi two-phase flow by taking into account the properties and flow characteristics of the two phases. The newly-developed IAC correlation can satisfactorily predict the experimental data of the N2-Pb/Bi two-phase flow with the mean relative error of 0.0609.