Post-dryout heat transfer to high-pressure water flowing upward in vertical channels with various flow obstacles
Post-dryout heat transfer to high-pressure water flowing upward in vertical channels with various flow obstacles
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DOI：
10.1016/j.ijheatmasstransfer.2012.08.036
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发表时间：
2012-12
影响因子：
5.2
通讯作者：
I. Anghel;H. Anglart
中科院分区：
文献类型：
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作者：
I. Anghel;H. Anglart
对高压水在不同流动障碍物存在下的垂直管和环空中的干涸后传热进行了实验研究。实验中的操作条件为：质量流量500 ~ 1750 kg/m ~ 2s，压力5 ~ 9 MPa，入口过冷度10 ~ 40 K，热流密度1.5MW/m ~ 2。在实验中使用了五种不同的测试段：三个内径为12.7mm和外径为24.3mm的环形测试段，在上部包含圆柱形和网格流障碍物，以及两个内径为24.3mm的管状测试段，具有和不具有针流障碍物。所有试验段的加热长度均为3650 mm。壁温测量与88热电偶位于沿着内杆和外管表面。由于存在流动障碍，仅观察到发展中的干燥后热传递。选定的干燥后的传热相关性进行了比较的实验数据。它已得出结论，所有测试的相关性预测显着更高的壁温比在本实验中获得的。一个简单的Saha模型的修正函数已被建议，显着改善的相关性和目前的数据之间的协议。
Post-dryout heat transfer to high pressure water was investigated experimentally in vertical tubes and annuli containing various flow obstacles. The operational conditions during the experiments were as follows: mass flux from 500 to 1750kg/m2s, pressure from 5 to 9MPa, inlet subcooling from 10 to 40K and heat flux up to 1.5MW/m2. Five different test sections were used in experiments: three annular test sections with inner diameter 12.7mm and outer diameter 24.3mm, containing cylindrical and grid flow obstacles in the upper part, and two tubular test sections with inner diameter 24.3mm with and without pin flow obstacles. The heated length in all test sections was 3650mm. The wall temperature was measured with 88 thermocouples located along the inner rod and the outer tube surfaces. Due to the presence of flow obstacles, only developing post-dryout heat transfer was observed. Selected post-dryout heat transfer correlations were compared to the experimental data. It has been concluded that all tested correlations predict significantly higher wall temperatures than those obtained in the present experiment. A simple correction function to the Saha model has been suggested which significantly improves the agreement between the correlation and the present data.