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Heat transfer performances of cryogenic fluids in offset strip fin-channels considering the effect of fin efficiency

机译：考虑翅片效率影响的偏置条形翅片通道中低温流体的传热性能

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摘要

This paper numerically explores the heat transfer behaviors of cryogenic fluids in offset strip fin (OSF) channels considering the important effect of fin efficiency that combines the factors of low thermal conductivity of fin material at cryogenic temperatures and the fin geometry. A series of numerical simulations, which involve three kinds of fin materials with different thermal conductivities and the cryogenic fluids including both gases and liquids of nitrogen, normal hydrogen and classic helium 4, are carried out with well-validated 3D models. The results show that lower thermal conductivity of solid material at cryogenic temperature causes a considerable reduction in heat transfer performance of OSF fins especially for the liquids with high Prandtl number. Further analysis of the results reveals that for different cryogenic fluids, Nusselt number is strongly related to Prandtl number and fin efficiency. In particular, Nusselt number is proportional to the Pr~(0.235)η_f ~(0.9) in laminar region, regardless of Reynolds number and fin geometries. The results for different fin geometries suggest that larger fin thickness-to-length ratio can help to improve the heat transfer performance, while smaller fin thickness-to-height ratio and higher fin density no longer contribute to higher j factor (or Nusselt number) of OSF fin, especially in the case of lower thermal conductivity of fin material. There exist optimum fin thickness-to-height ratio and fin density that correspond to the maximum value of j factor for the cryogenic fluids.
机译：考虑到翅片效率的重要影响，本文综合了翅片材料在低温下的低导热系数和翅片的几何形状，在数值上探索了偏移带状翅片（OSF）通道中的低温流体的传热行为。使用经过充分验证的3D模型进行了一系列数值模拟，涉及三种具有不同热导率的翅片材料以及包括氮气和普通氢气以及经典氦气4的气体和液体的低温流体。结果表明，低温下固体材料的较低的导热系数会导致OSF散热片的传热性能大大降低，尤其是对于具有高Prandtl数的液体而言。对结果的进一步分析表明，对于不同的低温流体，Nusselt数与Prandtl数和散热片效率密切相关。特别地，无论雷诺数和鳍几何形状如何，在层流区域中，努塞尔数均与Pr〜（0.235）η_f〜（0.9）成正比。不同翅片几何形状的结果表明，较大的翅片厚度与长度之比可以帮助改善传热性能，而较小的翅片厚度与高度之比和较高的翅片密度不再有助于较高的j因子（或Nusselt数）尤其是在散热片材料的导热系数较低的情况下。存在与低温流体的j系数最大值相对应的最佳翅片厚度与高度之比和翅片密度。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2017年第11期|1114-1125|共12页
  • 作者

    Yang Yujie; Li Yanzhong; Si Biao; Zheng Jieyu;

  • 作者单位

    State Key Laboratory of Power Engineering and Multiphase Flow, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Power Engineering and Multiphase Flow, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Power Engineering and Multiphase Flow, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Power Engineering and Multiphase Flow, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 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

    Cryogenic fluids; Fin efficiency; Heat transfer performance; Offset strip fins; Plate-fin heat exchanger;

    机译：低温液体;散热效率;传热性能;偏置鳍片;板翅式换热器;

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