Friction and local pressure loss characteristics of a 5 × 5 rod bundle with spacer grids
Friction and local pressure loss characteristics of a 5 × 5 rod bundle with spacer grids
复制标题
带间隔网格的 5 × 5 杆束的摩擦和局部压力损失特性
DOI：
10.1016/j.anucene.2019.107106
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发表时间：
2020-06
影响因子：
1.9
通讯作者：
Wan Sun
中科院分区：
文献类型：
--
作者：
Zaiyong Ma;Ting-pu Ye;Quan-yao Ren;Liang-ming Pan;Shanshan Bu;Luteng Zhang;Wan Sun
摘要本文介绍了带间隔栅的5 × 5杆束的摩擦和局部压力损失系数的实验结果和分析。在实验数据的基础上，评估了摩擦模型和局部压力损失模型，并讨论了间隔网格的作用。结果表明，Cheng和Todreas模型能较好地预测裸杆摩擦损失，而Chun模型适用于高Re条件，但在低Re条件下会严重低估电网局部损失。对于两相条件，提出了裸杆两相摩擦乘数的普遍相关性，发现所有现有模型都不能很好地预测电网局部损失乘数。结合均匀流动模型、液混合密度比以及作为网格参数e（网格条轴向投影面积）和空隙率函数的修正因子，可以获得较高的预测精度。
Abstract This paper presents the experimental results and analyses of the friction and local pressure loss coefficient of a 5 × 5 rod bundle with spacer grid. Based on the experimental data, friction and local pressure loss models were assessed and the role of spacer grid was discussed. The results showed that Cheng and Todreas model could predict bare rod friction loss well, and Chun model applied for high Re but would severely underestimate grid local loss for small Re. For two-phase condition, a universal correlation was proposed for bare rod two-phase friction multiplier, and it was found that all existing models cannot predict grid local loss multiplier very well. High prediction accuracy could be obtained by combining homogenous flow model, the liquid-mixture density ratio and a modification factor as a function of the grid parameter e (axial projected area of grid strip to flow area) and void fraction.
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DOI：
10.1016/j.ijheatmasstransfer.2018.12.008
发表时间：
2019-04
影响因子：
5.2
作者：
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