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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow and heat transfer performance of supercritical pressure carbon dioxide in pipes with discrete double inclined ribs
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Flow and heat transfer performance of supercritical pressure carbon dioxide in pipes with discrete double inclined ribs

机译：超临界压力二氧化碳在离散双斜肋管中的流动和传热性能

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摘要

Heated flow of supercritical pressure carbon dioxide in pipes with discrete double inclined ribs (DDIR) were numerically studied in this work. The turbulent flow and heat transfer was solved by a modified Shear Stress Transport k-ω model, where a variable turbulent Prandtl number formulation was incorporated. The model accuracy was verified by experimental data covering wide working conditions. Numerical runs were performed at 7.58 MPa, mass flux of 200 - 800 kg /(m~2•s), and heat flux of 56.7 kW/m~2. Results show that the strong buoyancy effect existing in smooth pipes was heavily inhibited by DDIR and no serious deterioration occurred. Sensitivity analysis on geometrical parameters suggest that the rib spacing the most sensitive one to the occurrence of heat transfer deterioration. The influence of inclination angle was much weaker than the rib height and spacing. The overall thermal performance of the DDIR pipe was the best when Bo* was around 4.5 × 10~(-6), with a PEC of 3-4. In the regions with very strong or negligible buoyancy, however, PEC was a much lower value between 1-2. The major role of discrete ribs is to interrupt the continuous development of near-wall buoyant layer and subsequently eliminate the negative effect of buoyancy on heat transfer. Ribs cannot effectively increase the positive effect of buoyancy on heat transfer. Finally, Bo* was found to be appropriate for the performance evaluation and optimization of enhancement techniques for supercritical heat transfer.
机译：在这项工作中，对具有离散双斜肋（DDIR）的管道中超临界压力二氧化碳的热流进行了数值研究。湍流和传热通过修改后的剪切应力传递k-ω模型解决，其中引入了可变湍流Prandtl数公式。通过涵盖广泛工作条件的实验数据验证了模型的准确性。在7.58 MPa，质量通量为200-800 kg /（m〜2•s）和热通量为56.7 kW / m〜2的条件下进行了数值模拟。结果表明，DDIR严重抑制了光滑管中存在的强浮力作用，并且没有发生严重的劣化。对几何参数的敏感性分析表明，肋骨间距对传热恶化最敏感。倾斜角度的影响远小于肋骨的高度和间距。当Bo *约为4.5×10〜（-6）且PEC为3-4时，DDIR管的整体热性能最佳。但是，在浮力非常强或可忽略不计的区域中，PEC的值在1-2之间低得多。离散肋的主要作用是中断近壁浮力层的持续发展，从而消除浮力对热传递的负面影响。肋不能有效地增加浮力对热传递的积极作用。最后，发现Bo *适用于性能评估和超临界传热增强技术的优化。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第3期|119175.1-119175.17|共17页
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  • 作者单位

    State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Yunnan 650093 China;

    Shanxi Research Institute for Clean Energy Tsinghua University Shanxi 030032 China;

    Engineering Research of Metallurgy Energy Conservation & Emission Reduction Ministry of Education Kunming University of Science and Technology Yunnan 650093 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

    Supercritical carbon dioxide; Heat transfer enhancement; Buoyancy effect; Longitudinal swirl flow; Thermal-hydraulic; performance;

    机译：超临界二氧化碳;传热增强;浮力作用;纵向旋流;热工液压;性能;

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