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首页> 外文期刊>International Journal of Heat and Mass Transfer >Turbulent natural convection of sodium in a cylindrical enclosure with multiple internal heat sources: A conjugate heat transfer study
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Turbulent natural convection of sodium in a cylindrical enclosure with multiple internal heat sources: A conjugate heat transfer study

机译：具有多个内部热源的圆柱形外壳中钠的湍流自然对流：共轭传热研究

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摘要

Turbulent natural convection of liquid metal in a cylindrical enclosure with locally distributed heat source has been investigated for Boussinesq number in the range of 4.5 × 0~(11)-6.25 × 10~(12). The enclosure considered is an ideal model of the lower plenum of a fast reactor with tray( s) holding damaged core debris, which continuously generate heat. The focus of the study has been to assess the heat dissipation capacity of single and multiple trays in respecting the specific temperature limits on the tray(s). Heat conduction in the metallic trays and in the impervious core debris mixture and turbulent natural convection of the liquid sodium are solved as a conjugate heat transfer problem. The equations that govern the various heat transfer processes in 2-D axi-symmetric cylindrical polar coordinate system have been solved by the finite volume method. Turbulence has been modeled by the k-ε. turbulence model, without the use of wall functions. The predictions of the numerical model have been validated against benchmark data reported in open literature. Also, experiments have been conducted in an ideal water model towards validation of the computational model. For typical enclosure dimensions representing a 500 MWe fast reactor, it is seen that the critical parameters are heat dissipation area of the source (area of trays) and the thickness of the heat source (debris thickness). With increase in the number of trays, the heat transfer area increases while the debris thickness reduces. Both these effects lead to reduction in the tray as well as source temperatures. The heat dissipation capacity exhibits a non-linear relationship with the number of plates.
机译：研究了液态金属在具有局部分布热源的圆柱形外壳中的湍流自然对流，其Boussinesq数在4.5×0〜（11）-6.25×10〜（12）范围内。所考虑的外壳是快速反应堆下部通风室的理想模型，该反应堆下部装有托盘，托盘可容纳不断产生热量的受损堆芯碎屑。研究的重点是评估单个和多个托盘的散热能力，并考虑到托盘上的特定温度限制。作为共轭传热问题，解决了金属塔板和不透性芯碎屑混合物中的热传导以及液态钠的湍流自然对流。用有限体积法求解了控制二维轴对称圆柱极坐标系中各种传热过程的方程。湍流已通过k-ε建模。湍流模型，无需使用墙函数。数值模型的预测已针对公开文献中报告的基准数据进行了验证。而且，已经在理想的水模型中进行了实验以验证计算模型。对于代表500 MWe快堆的典型外壳尺寸，可以看出关键参数是源的散热面积（塔板面积）和热源的厚度（碎屑厚度）。随着塔盘数量的增加，传热面积增加，而碎屑厚度减小。这两种效果都会导致托盘以及源温度的降低。散热能力与板数呈非线性关系。

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