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Flow field and friction factor of slush nitrogen in a horizontal circular pipe

机译：水平圆管中泥浆氮的流场和摩擦因子

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摘要

Slush nitrogen is the low-temperature two-phase fluid with solid nitrogen particle suspended in the liquid nitrogen. The flow characteristics of slush nitrogen in a horizontal pipe with the diameter of 16 mm have been experimentally and numerically investigated, under the operating conditions with the inlet flow velocity of 0-4 m/s and the solid volume fraction of 0-23%. The numerical results for pressure drop agree well with those of the experiments, with the relative errors of +/- 5%. The experimental and numerical results both show that the pressure drop of slush nitrogen is greater than that of subcooled liquid nitrogen and rises with the increasing particle concentration, under the working conditions in present work. Based on the simulation result, the flow pattern evolution of slush nitrogen with the increasing slush Reynolds number has been discussed, which can be classified into homogenous flow, heterogeneous flow and moving bed. The slush effective viscosity and the slush Reynolds number are calculated with Cheng & Law formula, which includes the effects of particle shape, size and type and has a high accuracy for high concentration slurries. Based on the slush Reynolds number, an experimental empirical correlation considering particle conditions for the friction factor of slush nitrogen flow is obtained.
机译：稀氮是低温两相流体，具有悬浮在液氮中的固体氮颗粒。通过直径为16mm的水平管中的浸出氮的流动特性在实验和数值上进行了实验和数值研究，在操作条件下，入口流速为0-4m / s，固体体积分数为0-23％。压力降的数值结果与实验的数值吻合良好，相对误差为+/- 5％。实验性和数值结果既表明，在本作工作中的工作条件下，浸泡氮的压降大于液氮的压力下降并随着颗粒浓度的增加而上升。基于仿真结果，已经讨论了泥浆氮的流动模式演化，随着增加的泥沙雷诺数，可以分为均匀流动，异构流动和移动床。用程法配方计算纤溶有效粘度和泥浆雷诺数，包括颗粒形状，尺寸和类型的效果，并且具有高浓度浆料的高精度。基于Slush Reynolds数，获得考虑填充氮流摩擦因子的粒子条件的实验性经验相关。

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  • 来源
    《Cryogenics》 |2018年第2018期|共9页
  • 作者

    Jin Tao; Li Yijian; Wu Shuqin; Wei Jianjian;

  • 作者单位

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 制冷工程;低温物理学;
  • 关键词

    Slush nitrogen; High temperature superconductor cooling; Cryogenic multiphase flow; Flow pattern; CFD;

    机译：纤维氮;高温超导体冷却;低温多相流动;流动模式;CFD;

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