Abstract The static correlations from RELAP5 and TRACE as well as the interfacial area transport equation (IATE) are benchmarked for flashing flow with selected cases from a recently published experimental data set. The RELAP5 correlation is able to predict the interfacial area concentration more accurately than the TRACE correlation. The one-group decoupled IATE, supplied with experimental void fraction, shows overprediction of interfacial area concentration, especially at low-pressure conditions. Additionally, the one-group IATE is solved simultaneously with the void transport equation where at low pressures, the accuracy of the predicted interfacial area concentration improves even with the void fraction being underpredicted. However, as the pressure increases, the improving accuracy of the predicted void fraction leads to an overprediction of the interfacial area concentration. The two-group IATE is also benchmarked, first using the interfacial mass generation model from RELAP5 and TRACE and then with a model derived through a mass-energy balance approach. The accuracy of the two-group IATE is observed to be sensitive to the choice of the heat transfer length scale and Nusselt number correlations.

中文翻译：

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验证界面面积输运方程与空隙输运方程相结合以预测闪蒸

摘要 来自 RELAP5 和 TRACE 的静态相关性以及界面面积传输方程 (IATE) 以最近发布的实验数据集中的选定案例为基准，用于闪蒸流。RELAP5 相关性能够比 TRACE 相关性更准确地预测界面区域浓度。一组解耦 IATE，提供实验空隙率，显示界面面积浓度的高估，尤其是在低压条件下。此外，一组 IATE 与空隙传输方程同时求解，其中在低压下，即使空隙率被低估，预测界面面积浓度的准确性也会提高。然而，随着压力的增加，预测空隙率精度的提高导致界面面积浓度的高估。两组 IATE 也进行了基准测试，首先使用来自 RELAP5 和 TRACE 的界面质量生成模型，然后使用通过质量-能量平衡方法得出的模型。观察到两组 IATE 的准确性对传热长度尺度和 Nusselt 数相关性的选择很敏感。