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首页> 外文期刊>Journal of Heat Transfer >Pressure Drop and Heat Transfer of Nanofluid in Turbulent Pipe Flow Considering Particle Coagulation and Breakage
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Pressure Drop and Heat Transfer of Nanofluid in Turbulent Pipe Flow Considering Particle Coagulation and Breakage

机译：考虑颗粒凝结和破损的湍流管道中纳米流体的压降和传热

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摘要

Numerical simulations of Al_2O_3/water nanofluid in turbulent pipe flow are performed with considering the particle convection, diffusion, coagulation, and breakage. The distributions of particle volume concentration, the friction factor, and heat transfer characteristics are obtained. The results show that the initial uniform distributions of particle volume concentration become nonuniform, and increase from the pipe wall to the center. The nonuniformity becomes significant along the flow direction from the entrance and attains a steady state gradually. Friction factors increase with the increase of particle volume concentrations and particle diameter, and with the decrease of Reynolds number. The friction factors increase remarkably at lower volume concentration, while slightly at higher volume concentration. The presence of nanoparticles provides higher heat transfer than pure water. The Nusselt number of nanofluids increases with increasing Reynolds number, particle volume concentration, and particle diameter. The rate increase in Nus-selt number at lower particle volume concentration is more than that at higher concentration. For a fixed particle volume concentration, the friction factor is smaller while the Nusselt number is larger for the case with uniform distribution of particle volume concentration than that with nonuniform distribution. In order to effectively enhance the heat transfer using nanofluid and simultaneously save energy, it is necessary to make the particle distribution more uniform. Finally, the expressions of friction factor and Nusselt number as a function of particle volume concentration, particle diameter and Reynolds number are derived based on the numerical data.
机译：考虑到颗粒对流，扩散，凝结和破裂，对湍流管道中的Al_2O_3 /水纳米流体进行了数值模拟。得到了颗粒体积浓度，摩擦系数和热传递特性的分布。结果表明，颗粒体积浓度的初始均匀分布变得不均匀，并且从管壁到中心逐渐增大。从入口沿流动方向的不均匀性变得显着，并逐渐达到稳态。摩擦系数随着颗粒体积浓度和粒径的增加以及雷诺数的减少而增加。摩擦系数在较低的体积浓度下显着增加，而在较高的体积浓度下略有增加。纳米粒子的存在提供了比纯水更高的热传递。纳米流体的努塞尔数随雷诺数，颗粒体积浓度和粒径的增加而增加。在较低的颗粒体积浓度下，Nus-selt数的增加速率大于在较高浓度下的Nus-selt数的增加速率。对于固定的颗粒体积浓度，与不均匀分布的颗粒相比，在颗粒体积浓度均匀分布的情况下，摩擦系数较小，而努塞尔数较大。为了有效地提高使用纳米流体的传热并同时节省能量，有必要使颗粒分布更均匀。最后，根据数值数据推导了摩擦系数和努塞尔数随颗粒体积浓度，粒径和雷诺数的变化关系。

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  • 来源
    《Journal of Heat Transfer》 |2014年第11期|111701.1-111701.9|共9页
  • 作者

    Jian-Zhong Lin; Yi Xia; Xiao-Ke Ku;

  • 作者单位

    State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China Institute of Fluid Mechanics, China Jiliang University, Hangzhou 310018, China;

    State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;

    Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway;

  • 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

    Al_2O_3/water nanofluids; pressure drop; heat transfer; turbulent pipe flow; numerical simulation; coagulation; breakage;

    机译：Al_2O_3 /水纳米流体;压力下降;传播热量;湍流数值模拟凝结;破损;

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