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首页> 外文期刊>Journal of Heat Transfer >Heat Transfer, Pressure Drop, and Entropy Generation in a Solar Collector Using SiO_2/Water Nanofluids: Effects of Nanoparticle Size and pH
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Heat Transfer, Pressure Drop, and Entropy Generation in a Solar Collector Using SiO_2/Water Nanofluids: Effects of Nanoparticle Size and pH

机译：使用SiO_2 /水纳米流体的太阳能集热器中的传热，压降和熵产生：纳米颗粒大小和pH值的影响

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摘要

In this paper, an analytical study is carried out on the heat transfer, pressure drop, and entropy generation in a flat-plate solar collector using SiO_2/water nanofluid with volume concentration of 1%. In the study, the effects of two different values of pH, i.e., 5.8 and 6.5, and two different sizes of nanoparticles, i.e., 12 nm and 16 nm, on the entropy generation rate in turbulent flow are investigated. The results are compared with the results obtained for the case of water. The findings show that by using the Brinkman model to calculate the viscosity instead of experimental data one obtains a higher heat transfer coefficient and thermal efficiency than that in the case of water, while, when the experimental data are used, the heat transfer coefficient and thermal efficiency of water are found to be higher than that of nanofluids. The results reveal that using nanofluids increases the outlet temperature and reduces the entropy generation rate. It is also found that for nanofluids containing the particles with a size of 16 nm, the increase in pH value would increase the entropy generation rate, while for nanoparticles with a size of 12 nm the increase in pH would decrease the entropy generation.
机译：本文对使用浓度为1％的SiO_2 /水纳米流体的平板太阳能集热器的传热，压降和熵产生进行了分析研究。在研究中，研究了两种不同的pH值（即5.8和6.5）以及两种不同尺寸的纳米颗粒（即12 nm和16 nm）对湍流中熵产生率的影响。将结果与水情况下的结果进行比较。研究结果表明，通过使用Brinkman模型代替实验数据来计算粘度，可以获得比水情况下更高的传热系数和热效率，而使用实验数据时，传热系数和热效率更高。发现水的效率高于纳米流体的效率。结果表明，使用纳米流体会增加出口温度并降低熵产生速率。还发现对于含有尺寸为16nm的颗粒的纳米流体，pH值的增加将增加熵产生速率，而对于尺寸为12nm的纳米颗粒，pH的增加将降低熵产生。

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  • 来源
    《Journal of Heat Transfer》 |2015年第6期|061011.1-061011.9|共9页
  • 作者

    Omid Mahian; Ali Kianifar; Ahmet Z. Sahin; Somchai Wongwises;

  • 作者单位

    Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91777-1111, Iran;

    Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91777-1111, Iran;

    Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;

    Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;

  • 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

    entropy generation; solar collector; pressure drop; nanofluid pH; particle size;

    机译：熵产生太阳能集热器压力下降;纳米流体pH;粒径;

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