Experimental Investigation of the Transient Pool Boiling Heat Transfer on the Quenching of Vertical Rodlet in Water

Zefeng Wang, Jian Deng, Libo Qian, R. Cai, Jinbiao Xiong, Lei Zhong, Yugao Ma
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Abstract

Quenching is an important phenomenon in the evaluation of an emergency core cooling system following a hypothetical loss of coolant accident (LOCA) in a nuclear reactor. In the present study, an experimental apparatus is designed and constructed with the purpose of conducting high-temperature transient pool boiling quenching experiments for zirconium (Zr-4) cylindrical test samples. Three thermocouples are inserted in the test sample to investigate the effect of axial distance on the minimum film boiling temperature. The Zr-4 rodlet is heated up to a temperature well above the minimum film boiling temperature (up to 600°C), and then plunged vertically in a quiescent pool of subcooled water. A data acquisition system is used to record the temperature of the embedded thermocouples with time. Data reduction is performed by an inverse heat conduction code to calculate the surface temperature and corresponding surface heat flux. A visualization study with a high-speed camera is conducted to record the quenching behavior on the test sample. It is found that the minimum film boiling temperature decreases with the axial distance, while the CHF temperature is relatively insensitive to the axial distance. The film boiling heat transfer coefficient decreases with surface temperature, and seems to be independent of axial distance. The quench front is observed to originate from the bottom and move upwards. It is found that the quench front velocity remains nearly constant in the lower region of the test sample, and significantly increases in the upper region.
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水中垂直小棒淬火瞬态池沸腾传热的实验研究
淬火是核反应堆发生冷却剂损失事故后应急堆芯冷却系统评估中的一个重要现象。本研究设计并搭建了一套实验装置,对锆(Zr-4)圆柱形试样进行高温瞬态池沸腾淬火实验。在试样中插入三个热电偶,研究轴向距离对膜沸腾温度的影响。Zr-4小棒被加热到远高于最低薄膜沸腾温度(高达600°C)的温度,然后垂直浸入过冷水的静止池中。数据采集系统用于记录嵌入式热电偶温度随时间的变化。数据化简是通过一个反热传导代码来计算表面温度和相应的表面热流密度。利用高速摄像机对试样的淬火行为进行了可视化研究。发现膜的最低沸腾温度随轴向距离的增加而降低,而CHF温度对轴向距离相对不敏感。膜沸腾换热系数随表面温度的升高而减小,与轴向距离无关。观察到淬火锋面起源于底部并向上移动。结果表明,试样下部淬火锋速度基本保持不变,上部淬火锋速度明显增大。
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