Forced Convection Heat Transfer Characteristics of Slush Nitrogen in Turbulent Pipe Flows

湍流管流中氮泥强制对流换热特性

基本信息

  • 批准号:
    18360096
  • 负责人:
  • 金额:
    $ 5.97万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2006
  • 资助国家:
    日本
  • 起止时间:
    2006 至 2007
  • 项目状态:
    已结题

项目摘要

Slush Fluids, such as slush hydrogen and slush nitrogen, are two-phase (solid-liquid) single-component cryogenic fluids containing solid particles in a liquid. The objectives of the present study are to investigate the forced convection heat transfer characteristic and thermo-fluid instability of slush nitrogen flowing in a pipe, and to develop the numerical code to evaluate the thermo-fluid phenomenon of the slush fluid flowing in a pipe.Experimental tests were performed with the slush nitrogen in the ranges of solid fraction from 0 to 40 wt% and mean velocity from 1 to 6m/s to obtain both the forced convection heat transfer coefficient and the frictional pressure drop flowing in a horizontal copper pipe. Compared with the experimental results of subcooled liquid nitrogen, the deterioration phenomena of heat transfer coefficients for slush nitrogen caused by the pressure drop reduction were found and cleared in the present study. This is the important and useful result for applying the slush fluid as a refrigerant to superconducting equipments.Three-dimensional numerical simulation method including the gravity effect based on the two-fluid model has been developed to clarify the characteristics of the cryogenic two-phase slush fluid in a straight pipe flow. It was found that the calculated results were in good agreement with the velocity distributions of solid particles measured by the new PIV (Particle Image Velocimetry) method. In consequence, the developed numerical code has been verified to be able to calculate the slush flow characteristics with sufficient accuracy.
半融化流体,例如半融化氢和半融化氮,是在液体中含有固体颗粒的两相(固-液)单组分低温流体。本文旨在研究氮浆在管内流动的强制对流换热特性和热-流不稳定性,在固体含量为0 ~ 40wt%,平均流速为1 ~ 6 m/s的范围内,对氮泥浆进行了实验研究,并对氮泥浆的热流体现象进行了数值模拟。得到了水平铜管内的强制对流换热系数和摩擦压降。通过与过冷液氮实验结果的对比,发现并消除了由于压降降低而引起的液氮传热系数恶化现象。这一结果对低温两相流在超导设备中的应用具有重要的指导意义。为了研究低温两相流在直管中的流动特性,建立了基于双流体模型的考虑重力影响的三维数值模拟方法。计算结果与PIV(Particle Image Velocimetry)方法测量的固体颗粒速度分布吻合较好。因此,开发的数值代码已被验证能够计算泥浆流特性具有足够的精度。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Experimental Study of Forced Convection Heat Transfer Characteristics for Slush Nitrogen Pipe Flow
泥浆氮气管流强制对流换热特性实验研究
スラッシュ窒素の水平管内二相流動特性に関する数値解析
水平管道中泥浆氮两相流特性数值分析
スラッシュ窒素の管内流動特性に関する数値解析
泥浆氮在管道中流动特性的数值分析
水平管内を流動するスラッシュ窒素の熱伝達特性
泥浆氮气在水平管道内流动的传热特性
Heat Transfer and Flow Characteristics in Slush Nitrogen Pipe Flow
泥浆氮气管流中的传热和流动特性
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OHIRA Katsuhide其他文献

OHIRA Katsuhide的其他文献

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{{ truncateString('OHIRA Katsuhide', 18)}}的其他基金

Study of the combined mechanism of heat transfer and pressure drop for cryogenic solid-liquid two-phase slush fluid.
低温固液两相泥浆流体传热与压降联合机理研究
  • 批准号:
    21360091
  • 财政年份:
    2009
  • 资助金额:
    $ 5.97万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)

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