Experimental study on distribution parameter characteristics in vertical rod bundles

Experimental study on distribution parameter characteristics in vertical rod bundles
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垂直杆束分布参数特性实验研究

DOI:
10.1016/j.ijheatmasstransfer.2018.12.008
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发表时间:
2019-04
影响因子:
5.2
通讯作者:
Zhong Tao
Zhong Tao
中科院分区:
工程技术2区
文献类型:
--
作者:
Ye Ting pu;Pan Liang ming;Ren Quan yao;Zhou Wen xiong;Zhong Tao

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漂移通量模型是棒材束两相流分析的重要模型。在空气-水两相流条件下进行了5 × 5棒束实验。液体表面速度范围为0.00 ~ 1.50 m/s,气体表面速度范围为0.02 ~ 6.00 m/s。用阻抗计测量了空隙率。为杆束建立了四种典型的漂通量模型,并与现有数据进行了比较。通过对实验数据的分析和可视化分析,发现再循环和湍流对分布参数的影响较大。为了考虑这两种影响,定义了一个临界液体速度,以确定随着液体速度的增加,哪种影响占主导地位,并引入了一个新的临界空隙率相关性,与从帽状气泡流到帽状湍流的流型转变有关,以确定分布参数。在已有模型的基础上建立的漂移通量模型具有较好的预测能力。
The drift-flux model is important for rod bundle two-phase flow analysis. A 5 × 5 rod bundles experiment has been performed under air-water two-phase flow conditions. The superficial liquid velocity ranges from 0.00 to 1.50 m/s while the superficial gas velocity ranges from 0.02 to 6.00 m/s. The void fraction has been measured by the impedance meter. Four typical drift-flux models developed for rod bundles have been compared with present data. By analyzing the experimental data and visualization, the distribution parameter may be influenced by the flow recirculation and turbulence significantly. In order to consider these two effects, a critical liquid velocity has been defined to determine which effect is dominant as the increase of liquid velocity, and a new critical void fraction correlation related to the flow-regime transition from cap-bubbly to cap-turbulent flow is incorporated to determine the distribution parameter. The new drift-flux model developed from existing models shows a good prediction capability.
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