The supercritical water undergoes drastic changes in the thermal physical properties near the pseudo-critical point. It is necessary to evaluate whether the conventional turbulent models could successfully capture the wall temperature variations. In this study, the heat transfer of the supercritical water in the vertical tube and multiple fuel rods channel is numerically investigated using different turbulent models. The numerical results are compared with the experimental data. The comparisons indicate that the realisable k - ɛ model, k – ω SST model, and the Reynolds stress model generally give a better agreement with the experimental data on the predictions of the wall temperatures. A new variable turbulent Prandtl model is proposed. Selected better performance turbulent models coupled with the proposed turbulent Prandtl model are assessed. The modified turbulent model shows a great improvement in the prediction of the wall temperatures, especially for the condition in a multiple fuel rods channel.

超临界水在准临界点附近的热物理性质发生剧烈变化。有必要评估传统的湍流模型是否可以成功地捕捉壁温变化。在这项研究中，使用不同的湍流模型对垂直管和多燃料棒通道中超临界水的传热进行了数值研究。数值结果与实验数据进行了比较。比较表明，可实现的k - ɛ模型，k - ωSST 模型和 Reynolds 应力模型在预测壁温时通常与实验数据具有更好的一致性。提出了一种新的可变湍流普朗特模型。评估了选定的性能更好的湍流模型以及所提出的湍流普朗特模型。改进后的湍流模型在预测壁温方面有很大改进，特别是对于多燃料棒通道中的情况。