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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation on cooling heat transfer and flow characteristic of supercritical CO_2 in spirally fluted tubes
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Numerical investigation on cooling heat transfer and flow characteristic of supercritical CO_2 in spirally fluted tubes

机译：螺旋槽管超临界CO_2冷热传热和流量特性的数值研究

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摘要

To study the heat transfer and flow characteristic of supercritical CO_2 cooling in the spirally fluted tubes, this paper presents numerically investigation of heat transfer performance of various cases within different geometric parameters (the radius of the groove r_1, the radius of the fillet r_2, the depth of the groove e_1, the distance between the main tube and the outer sleeve e_2 and the helix angle w). Based on the verified turbulent model at an inlet temperature of 323.15 K, an operating pressure of 8.0 MPa, an inlet Reynolds number of 35,000 and a total heat of 4200 W, the optimal structure is obtained (r_1 = 6.5 mm, r_2 = 2.0 mm, e_1 = 5.5 mm, e_2 = 1.0 mm, w = 0.70 rad) according to the evaluation factors proposed in the paper. The representative parameters (e_1 and w) are employed to investigate the variation of the local heat transfer coefficient and turbulent kinetic energy, and mechanisms underlying the effect of parameters on heat transfer are revealed. Furthermore, the buoyancy effect is also discussed. Results show that the buoyancy force has an improvement effect on the heat transfer performance. However, as w increases, the influence of buoyancy will be weakened.
机译：为了研究螺旋槽管中超临界CO_2冷却的传热和流量特性，本文提出了不同几何参数（凹槽R_1的半径，圆角R_2的半径）对传热性能的数值研究。凹槽E_1的深度，主管和外套筒E_2之间的距离和螺旋角度W）。基于323.15 k的入口温度的经过认证的湍流模型，在8.0MPa的操作压力下，入口雷诺数为35,000，获得的总热量为4200W，获得最佳结构（R_1 = 6.5mm，R_2 = 2.0mm根据本文提出的评估因子，e_1 = 5.5 mm，e_2 = 1.0 mm，w = 0.70 rad）。代表参数（E_1和W）用于研究局部传热系数和湍流动能的变化，并揭示了参数对传热的影响的机制。此外，还讨论了浮力效应。结果表明，浮力力对传热性能的影响有所改善。然而，随着W增加，浮力的影响将被削弱。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第12期|120399.1-120399.14|共14页
  • 作者

    Zhongyang Yu; Leren Tao; Lihao Huang; Dong Wang;

  • 作者单位

    Institute of Refrigeration and Cryogenics University of Shanghai for Science and Technology Shanghai 200093 People's Republic of China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power and Engineering University of Shanghai for Science and Technology Shanghai 200093 People's Republic of China;

    Institute of Refrigeration and Cryogenics University of Shanghai for Science and Technology Shanghai 200093 People's Republic of China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power and Engineering University of Shanghai for Science and Technology Shanghai 200093 People's Republic of China;

    Institute of Refrigeration and Cryogenics University of Shanghai for Science and Technology Shanghai 200093 People's Republic of China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power and Engineering University of Shanghai for Science and Technology Shanghai 200093 People's Republic of China;

    School of Civil Engineering and Architecture Anhui University of Technology Ma'anshan 243002 People's Republic of 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 CO_2; Spirally fluted tube; Cooling heat transfer; Geometric parameter; Buoyancy;

    机译：超临界CO_2;螺旋凹槽管;冷却热转印;几何参数;浮力;

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