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首页> 外文期刊>Journal of Applied Physics >The effect of particle size on the effective thermal conductivity of Al_2O_3-water nanofluids
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The effect of particle size on the effective thermal conductivity of Al_2O_3-water nanofluids

机译：粒径对Al_2O_3-水纳米流体有效导热系数的影响

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摘要

A steady-state method was used to evaluate the effective thermal conductivity of Al_2O_3/distilled water nanofluids with nanoparticle diameters of 36 and 47 nm. Tests were conducted over a temperature range of 27-37 ℃ for volume fractions ranging from 0.5% to 6.0%. The thermal conductivity enhancement of the two nanofluids demonstrated a nonlinear relationship with respect to temperature, volume fraction, and nanoparticle size, with increases in the volume fraction, temperature, and particle size all resulting in an increase in the measured enhancement. The most significant finding was the effect that variations in particle size had on the effective thermal conductivity of the Al_2O_3/distilled water nanofluids. The largest enhancement difference observed occurred at a temperature of approximately 32 ℃ and at a volume fraction of between 2% and 4%. The experimental results exhibited a peak in the enhancement factor in this range of volume fractions for the temperature range evaluated, which implies that an optimal size exists for different nanoparticle and base fluid combinations. This phenomenon can be neither predicted nor explained using the theoretical models currently available in the literature.
机译：采用稳态方法评估纳米粒径为36和47 nm的Al_2O_3 /蒸馏水纳米流体的有效导热系数。在27-37℃的温度范围内进行测试，体积分数为0.5％至6.0％。两种纳米流体的热导率增强表现出关于温度，体积分数和纳米粒子大小的非线性关系，随着体积分数，温度和粒子大小的增加，所有这些都导致所测量的增强作用的增加。最重要的发现是粒径变化对Al_2O_3 /蒸馏水纳米流体的有效热导率的影响。观察到的最大增强差异出现在约32℃的温度下，且体积分数在2％至4％之间。实验结果表明，在所评估的温度范围内，该体积分数范围内的增强因子达到峰值，这表明存在不同纳米颗粒和基础流体组合的最佳尺寸。使用文献中当前可用的理论模型既无法预测也无法解释这种现象。

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  • 来源
    《Journal of Applied Physics》 |2007年第4期|p.044312.1-044312.5|共5页
  • 作者

    Calvin H. Li; G. P. Peterson;

  • 作者单位

    Department of Mechanical, Aeronautical, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180;

  • 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 应用物理学;计量学;
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