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Effect of Volume Fraction of γ-Al_2O_3 Nanofluid on Heat Transfer Enhancement in a Concentric Tube Heat Exchanger

机译:γ-Al_2O_3纳米流体体积分数对同心管式换热器传热增强的影响

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摘要

In this work, γ-Al_2O_3 nanoparticles with mean diameter of 10 nm are dispersed in deionized water with four nanoparticle volume concentrations of 0.25, 0.5, 0.75, and 1%. The effect of γ-Al_2O_3/Avater nanofluids on the heat transfer enhancement of heat exchangers is investigated under turbulent regime for four different volumetric flow rates of 150, 200, 250, and 300 L/h. The experimental results showed that the convective heat transfer is increased by increasing particles volume fraction as well as flow rate. The maximum enhancement obtained in Nusselt number and heat transfer coefficient was 20 and 22.8%, respectively, at Reynolds number of 6026 and particle volume fraction of 1%. The experimental Nusselt numbers of nanofluids showed good agreement with the available empirical correlation at particle volume fractions of 0.25 and 0.5%. An empirical correlation is obtained to estimate the Nusselt number of nanofluid under the conditions of this work.
机译:在这项工作中,将平均直径为10 nm的γ-Al_2O_3纳米颗粒分散在去离子水中,其中四个纳米颗粒的体积浓度分别为0.25、0.5、0.75和1%。在四种不同的体积流量150、200、250和300 L / h的湍流状态下,研究了γ-Al_2O_3/ Avater纳米流体对热交换器传热增强的影响。实验结果表明,对流换热通过增加颗粒的体积分数和流速而增加。雷诺数为6026,粒子体积分数为1%时,努塞尔数和传热系数的最大增强分别为20和22.8%。在流体体积分数为0.25和0.5%时,纳米流体的实验Nusselt数与可用的经验相关性显示出很好的一致性。在这项工作的条件下,获得了经验相关性以估计纳米流体的努塞尔数。

著录项

  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1387-1396|共10页
  • 作者单位

    Mechanical Engineering Department, Nahrain University, Jadiriya, PO Box 64040, Baghdad, Iraq;

    Mechanical Engineering Department, Nahrain University, Baghdad, Iraq;

  • 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
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