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Numerical Analysis of a Small Size Baffled Shell-and-Tube Heat Exchanger Using Different Nano-Fluids

机译：使用不同纳米流体的小尺寸折流板壳式换热器的数值分析

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摘要

In this study, numerical simulation was used to investigate the effect of adding different nano-particles into the fluid on the performance of a baffled shell-and-tube heat exchanger. A three-dimensional modeling approach was followed to analyze the effect of different nano-fluids, at various volume fractions, as applied in a baffled shell-and-tube heat exchanger. Once finished with validating the grid independency and results, we proceeded to obtain heat transfer rate, pressure drop, outlet shell temperature and exchanger effectiveness for different volume fractions and particle size of different nano-fluids. The studied nano-particles in the present work included Al_2O_3, CuO, Fe_2O_3, Cu, Fe, SiO_2, and Au, with water and ethylene glycol employed as base fluids. With constant mass flow rate for all cases, the results indicated that, the addition of nano-particles had reduced the heat transfer coefficient, pressure drop and the rate of heat transfer through the shell, even though it had increased outlet shell temperature. In other words, considering a constant heat transfer rate, the presence of nano-fluids in a baffled shell-and-tube heat exchanger is likely to be associated with increased outlet shell temperature. Another consequence presents that using ethylene glycol as base fluid leads to higher effectiveness compared with water as a base fluid in exchanger.
机译：在这项研究中，数值模拟被用来研究向流体中添加不同的纳米颗粒对折流板壳式换热器性能的影响。遵循三维建模方法，以分析在折流式壳管式换热器中应用的不同体积分数的不同纳米流体的影响。一旦完成了对网格独立性和结果的验证，我们就可以得到不同纳米流体的不同体积分数和粒径的传热速率，压降，出口壳温度和交换器有效性。本工作中研究的纳米粒子包括Al_2O_3，CuO，Fe_2O_3，Cu，Fe，SiO_2和Au，其中水和乙二醇用作基础液。在所有情况下，在恒定质量流量的情况下，结果表明，即使纳米颗粒的加入增加了出口外壳的温度，也降低了其传热系数，压降和通过外壳的传热速率。换句话说，考虑到恒定的传热速率，在折流式壳管式热交换器中纳米流体的存在可能与出口壳温度的升高有关。另一个结果表明，与乙二醇作为交换器中的基础液相比，使用乙二醇作为基础液可带来更高的效率。

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  • 来源
    《Heat Transfer Engineering》 |2018年第4期|141-153|共13页
  • 作者

    Ali Heydari; Mostafa Shateri; Sina Sanjari;

  • 作者单位

    Energy and Sustainable Development Research Center, Semnan Branch, Islamic Azad University, Semnan, Iran;

    Young Researchers and Elite Club, Semnan Branch, Islamic Azad University, Semnan, Iran;

    Young Researchers and Elite Club, Semnan Branch, Islamic Azad University, Semnan, Iran;

  • 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
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