矩形窄缝通道内流动沸腾的数值模拟研究  

Numerical Investigation of Flow Boiling Characteristics Using Two-Fluid Eulerian CFD Model in Narrow Rectangular Channel

作　　者：韩晋玉 刘瑶 赵陈儒[1] 薄涵亮[1] HAN Jinyu;LIU Yao;ZHAO Chenru;BO Hanliang(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《工程热物理学报》2024年第10期3151-3159,共9页Journal of Engineering Thermophysics

基　　金：中核“菁英计划”项目;中核领创科研项目。

摘　　要：窄缝通道换热技术是一体化小型模块式反应堆发展的关键技术之一。基于窄缝沸腾换热原理的换热器具有结构紧凑和换热能力强等特点。本文采用基于欧拉–欧拉法的两流体模型以及RPI壁面沸腾模型对矩形窄缝通道内流动沸腾进行模拟,本文系统分析了不同封闭子模型的选择(包括汽泡脱离直径dw和汽化核心密度Nw)对流动沸腾中汽泡参数、传热及流场预测的影响。基于模拟结果下不同封闭模型的选择,提出了适用于矩形窄缝通道内流动沸腾且工况适应范围较广的汽泡参数子模型的优化组合。研究结论可为反应堆换热元件和紧凑式换热器设计计算提供参考依据。Narrow channel heat exchange technology is one of the key technologies for the development of integrated small modular reactors(SMR),since the flow boiling heat transfer in the narrow channel has the potential to result in higher heat transfer efficiency and more compact structure for the heat exchangers in SMR.The‘wall heat flux partitioning’(WHFP)model in conjunction with an Eulerian–Eulerian Multiphase Flow(EEMF)method is found to be an apartment tool for two-phase hydrothermal analysis.In this paper,the accuracy of the EEMF-WHFP is evaluated over a large database of boiling flows in a narrow rectangular channel,avoiding the rather popular case-by-case tuning of descriptive models to a limited number of experiments.In this paper,the effects of different sub-models(including bubble departure diameter dw and nucleation site density Nw)on bubble parameters,heat transfer and flow field prediction in flow boiling are systematically analyzed.Based on the selection of different sub-model under the simulation results,an optimized combination of bubble parameter sub-models suitable for flow boiling in rectangular narrow channels with a wide range of working conditions is proposed.The conclusions can provide reference for the design and calculation of reactor heat exchange elements and compact heat exchangers.

关 键 词：矩形窄缝通道 流动沸腾 CFD 壁面沸腾模型 

分 类 号：TB126[理学—工程力学]