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首页> 外文期刊>International Journal of Heat and Mass Transfer >Parameter analysis of natural convection thermal characteristics in internally heated pool
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Parameter analysis of natural convection thermal characteristics in internally heated pool

机译：内部加热池自然对流热特性的参数分析

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摘要

The natural convection thermal behavior with high Rayleigh number was important in many industrial situations accompanied by internal heating, strong turbulence and solidification process. Experiments were carried out to investigate natural convection thermal characteristics in internally heated pool. Both water and nitrate were selected as simulant materials. The pool temperature along height, heat flux and crust thickness along polar angle were obtained from experiments. The effects of heating power density, pool height, crust solidification, cooling boundary were investigated. Moreover, the geometry effect of 2D and 3D were investigated based on the CFD simulation. The crust formation resulted in higher heat transfer on top with the largest heat flux ratio of 2.4 in nitrate cases and only 1.9 in water cases, indicating that the relationship without solidification applied in system codes may lead to lower peak heat flux at pool top. The Nu_(dn) increased exponentially and the Nu_(dn) from nitrate tests were higher than those from water tests with larger temperature gap T_(max)-T_(int). The cooling effectiveness of 3D hemispherical pool was 1.5 times that of 2D slice pool. However, the Nu_(dn) from hemispherical simulation was 24.06% higher than the COPRA relation prediction. The application of two-dimensional results needs consideration of geometry extrapolation for further application.
机译：具有高瑞利人数的自然对流热行为在许多工业情况下很重要，伴随着内部加热，强大的湍流和凝固过程。进行实验，以研究内部加热池中的自然对流热特性。选择水和硝酸盐作为模拟材料。沿着高度，沿着极角的高度，热通量和地壳厚度的池温度是从实验中获得的。研究了加热功率密度，池高，地壳凝固，冷却边界的影响。此外，基于CFD仿真研究了2D和3D的几何效应。地壳形成导致顶部的热传递较高，硝态病例中的最大热量比为2.4，水箱中只有1.9，表明在系统代码中施加的情况下的关系可能导致泳池顶部的峰值热通量降低。 Nu_（DN）呈指数级增长，硝酸盐测试的NU_（DN）高于来自温度差距T_（MAX）-T_（int）的水测试的NU_（DN）。 3D半球池的冷却效果为2D切片池的1.5倍。然而，来自半球模拟的NU_（DN）比COPRA关系预测高24.06％。二维结果的应用需要考虑几何外推的进一步应用。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第6期|119603.1-119603.9|共9页
  • 作者

    Luteng Zhang; Zaiyong Ma; Wan Sun; G.H. Su; Liangming Pan;

  • 作者单位

    Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Chongqing University) Ministry of Education Chongqing 400044 China Postdoctoral Station of Power Engineering and Engineering Thermophysics Chongqing University Chongqing 400044 China;

    Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Chongqing University) Ministry of Education Chongqing 400044 China;

    Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Chongqing University) Ministry of Education Chongqing 400044 China;

    School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an 710049 China;

    Key Laboratory of Low-Grade Energy Utilization Technologies and Systems (Chongqing University) Ministry of Education Chongqing 400044 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Natural convection; Heat transfer; Solidification; Geometry effect;

    机译：自然对流;传播热量;凝固;几何效果;

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