Turbulent-Prandtl-number models for liquid lead-bismuth in triangular rod bundles

被引：0
|
作者：
Liu S. [1 ,2 ]
Yu D. [1 ,3 ]
Mei H. [1 ]
Wang Z. [1 ]
Zhang S. [1 ]
Li T. [1 ]
机构：
[1] Institute of Nuclear Energy Safety Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei
[2] University of Science and Technology of China, Hefei
[3] Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University, Beijing
来源：
He Jishu/Nuclear Techniques | 2022年 / 45卷 / 03期
关键词：
CFD numerical simulation; Lead-cooled fast reactor; Low Prandtl number fluid; Triangular rod bundles; Turbulent-Prandtl-number model;
D O I：
10.11889/j.0253-3219.2022.hjs.45.030604
中图分类号：
学科分类号：
摘要：
Background: In order to accurately predict the heat transfer characteristics in the sub-channel of fuel assembly for the low Prandtl number fluid, it is necessary to select a suitable turbulent-Prandtl-number model. Purpose: This study aims at the applicability of turbulent-Prandtl-number models for liquid lead-bismuth turbulence in triangular fuel rod bundles. Methods: Based on the triangular rod bundle heat transfer correlation, the turbulent models of Shear Stress Transfer (SST) k-ω was adopted to analyze the different rod bundle structures for five different kinds of turbulent-Prandtl-number models. The analysis results were compared with the recommended heat transfer correlation, which had been verified by experiment in the sub-channels for liquid lead-bismuth. The applicability of various turbulent-Prandtl-number models under different rod diameters and pitch diameter ratios was analyzed in details. Results: The results show that the global turbulent-Prandtl-number model is not only related to the Reynolds number Re and Peclet number Pe, but also related to the pitch-to-diameter ratio (P/D). In the entire region of (1.3≤P/D≤1.7), simulation results of turbulent-Prandtl-number model proposed by Kays are in good agreement with the values calculated by Mikityuk equation. All sorts of turbulent-Prandtl-number models have the best P/D scope of application. Conclusions: The related turbulent-Prandtl-number models can be used to predict the heat transfer characteristics of liquid lead-bismuth in the triangular rod bundles under different pitch diameter ratios. © 2022, Science Press. All right reserved.
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