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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical comparison of the heat transfer behaviors and buoyancy effects of supercritical CO_2 in various heating tubes
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Experimental and numerical comparison of the heat transfer behaviors and buoyancy effects of supercritical CO_2 in various heating tubes

机译：超临界CO_2在各种加热管中的传热行为和浮力效应的实验和数值比较

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摘要

For the different flow orientations and physical models, the influence of buoyancy effect on flow characteristics exist essential difference, the heat transfer behaviors change accordingly. To suppress heat transfer deterioration and improve heat transfer performance, it is quite necessary to discuss the heat transfer behaviors of supercritical CO_2 in various heating tubes. The heat transfer and flow characteristics of supercritical CO_2 heated in the vertically straight tube, horizontal tube, and vertical helical-coiled tube, with inner diameter of 4 mm, are comparatively studied by experiments and numerical simulations. The tests are conducted at operating pressures from 7.5 MPa to 9 MPa, the mass flow rate is in the range of 80-600 kg/(m~2•s). The heat flux covers a range from 10 kW/m~2 to 70 kW/m~2. The coupling relationship of buoyancy effect and flow characteristics in different physical models are revealed, and the various buoyancy criteria are validated with experimental data. The experimental results confirm that the employment of buoyancy parameter needs to take full account of the interaction between buoyancy force and flow orientations. And experimental data indicate that the heat transfer deterioration in the vertical tube is more serious than it in the horizontal tube. Generally, the helical-coiled tube has a noteworthy advantage for the average heat transfer performance, especially in the case of strong buoyancy. The new empirical correlations for the horizontal tube and helical-coiled tube are proposed with experimental data.
机译：对于不同的流动方向和物理模型，浮力效应对流动特性的影响存在本质上的差异，传热行为也随之变化。为了抑制传热恶化并改善传热性能，有必要讨论超临界CO_2在各种加热管中的传热行为。通过实验和数值模拟，比较研究了在垂直直管，水平管和垂直螺旋管中加热的超临界CO_2的传热和流动特性。测试在7.5 MPa至9 MPa的工作压力下进行，质量流率在80-600 kg /（m〜2•s）的范围内。热通量范围从10 kW / m〜2到70 kW / m〜2。揭示了不同物理模型中浮力效应与流动特性的耦合关系，并通过实验数据验证了各种浮力准则。实验结果证实，使用浮力参数需要充分考虑浮力与流向之间的相互作用。实验数据表明，垂直管的传热恶化比水平管的传热恶化更为严重。通常，螺旋盘管在平均传热性能方面具有明显的优势，特别是在强浮力的情况下。利用实验数据提出了水平管和螺旋管的新的经验关系式。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第3期|119074.1-119074.17|共17页
  • 作者

  • 作者单位

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University No. 174 Shazhengjie Shapingba Chongqing 400044. PR China;

    Chongqing Midea General Refrigeration Equipment Co. Ltd. No.15 Qiangwei Road Nanan District Chongqing PR China;

    Department of Human and Engineered Environmental Studies The University of Tokyo 5-1-5 Kashiwanoha Kashiwa-shi Chiba 277-8563 Japan;

  • 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

    Supercritical CO_2; Comparative study; Buoyancy effect; Heat transfer deterioration; Helical-coiled tube;

    机译：超临界CO_2;比较研究;浮力作用;传热恶化;螺旋管;

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