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Numerical prediction of flow characteristics of slush hydrogen in a horizontal pipe

机译：水平管中稀水氢气流动特性的数值预测

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摘要

Slush hydrogen has lower temperature, higher density and higher heat capacity than those of liquid hydrogen, and is considered as a potential propellant for novel aerospace rockets with decreased spacecraft size and weight. In this study, an improved three-dimensional numerical model based on Euler Euler two-fluid model has been built to predict the flow characteristics of slush hydrogen in a horizontal pipe. In this model, an effective viscosity of mixture, which takes the particle shape and size into consideration, is adopted to modify the drag law for interphase momentum exchange, and the wall boundary conditions for the solid phase are based on Johnson Jackson model which involves the friction and collision between the particle and the wall. The performance of the model has been verified by the comparison between the calculated results and the experimental data from the literatures and considered to be effective for slush hydrogen flow. The improved model is then used to analyze the effects of inlet velocity, solid fraction, particle size on the flow characteristics, including pressure gradient, solid volume fraction distribution and velocity distribution and abundant to predict the flow pattern shift. Moreover, the numerical results indicate that the pressure drops for subcooled liquid hydrogen, under some operating conditions, are greater than those of slush hydrogen, which are presented in some published experimental work. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译：与液态氢相比，稀氢具有更低的温度，更高的密度和更高的热容，被认为是新型航天器的潜在推进剂，其航天器尺寸和重量均减小。在这项研究中，建立了基于Euler Euler两流体模型的改进的三维数值模型，以预测水平管道中溶存氢的流动特性。在该模型中，考虑了颗粒形状和大小的有效混合物粘度被用来修正相间动量交换的阻力定律，而固相的壁边界条件是基于Johnson Jackson模型，其中涉及粒子与壁之间的摩擦和碰撞。通过将计算结果与来自文献的实验数据进行比较，验证了该模型的性能，并认为该模型对于流动的氢流很有效。然后使用改进的模型来分析入口速度，固相分数，粒径对流动特性（包括压力梯度，固相体积分数分布和速度分布）的影响，并充分预测流型的变化。此外，数值结果表明，在某些操作条件下，过冷液态氢的压降大于溶态氢的压降，这在一些已发表的实验工作中已经提出。 （C）2016氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

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  • 来源
    《International journal of hydrogen energy》 |2017年第6期|3778-3789|共12页
  • 作者

    Jin T.; Li Y. J.; Liang Z. B.; Lan Y. Q.; Lei G.; Gao X.;

  • 作者单位

    Zhejiang Univ, Inst Refrigerat & Cryogen, Key Lab Refrigerat & Cryogen Technol Zhejiang Pro, Hangzhou 310027, Zhejiang, Peoples R China|State Key Lab Technol Space Cryogen Propellants, Beijing 100028, 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;

    Beijing Inst Aerosp Testing Technol, Beijing 100074, Peoples R China;

    State Key Lab Technol Space Cryogen Propellants, Beijing 100028, Peoples R China;

    State Key Lab Technol Space Cryogen Propellants, Beijing 100028, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Slush hydrogen; Two-phase flow; Flow characteristics;

    机译：氢稀液;两相流;流动特性;

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