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首页> 外文期刊>Energy Conversion & Management >Performance of water based CuO and Al_2O_3 nanofluids in a Cu-Be alloy heat sink with rectangular microchannels
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Performance of water based CuO and Al_2O_3 nanofluids in a Cu-Be alloy heat sink with rectangular microchannels

机译：具有矩形微通道的Cu-Be合金散热器中水基CuO和Al_2O_3纳米流体的性能

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摘要

Single phase forced convective heat transfer and fluid flow of CuO/water and Al_2O_3/water nanofluids have been experimentally investigated in a microchannel heat sink (MCHS). The heat sink consisted of 17 rectangular cross section microchannels with the dimensions of 400 μm × 560 μm. All the experiments have been performed at constant heat flux of 19 W/cm~2 and at the laminar flow regime 500 ＜ Re ＜ 2000. Heat transfer coefficient, Nu number, and also pressure drop in the MCHS have been measured and compared with the conventional correlations. Both nanofluids showed greater heat transfer performance and larger pressure drop in comparison with pure water. Results indicated that 0.2 vol.% CuO and 1 vol.% Al_2O_3 nanofluids enhanced the heat transfer coefficient up to 27% and 49%, respectively. In this regards, CuO nanoparticle was more efficient since it could be used in lower concentration. Furthermore, it was shown that the heat transfer coefficient increased with increasing the nanoparticle concentration but it was not true to say that the heat transfer enhancement increased with Reynolds number. The results of this study in conjunction with previous papers indicated that lower Nu numbers and higher heat transfer coefficients would be obtained in the MCHS in comparison with the conventional diameter heat exchangers. It showed the greater importance of both conductive and convective heat transfer mechanisms in this kind of heat exchangers.
机译：已经在微通道散热器（MCHS）中实验研究了CuO /水和Al_2O_3 /水纳米流体的单相强制对流换热和流体流动。散热器由17个矩形横截面微通道组成，尺寸为400μm×560μm。所有实验均在恒定热通量为19 W / cm〜2且层流为500 ＜Re ＜2000的条件下进行。测量了MCHS的传热系数，Nu数以及压降，并将其与常规相关。与纯水相比，两种纳米流体均显示出更高的传热性能和更大的压降。结果表明，0.2％（体积）的CuO和1％（体积）的Al_2O_3纳米流体将传热系数分别提高了27％和49％。在这方面，CuO纳米颗粒更有效，因为它可以较低的浓度使用。此外，已经表明，随着纳米颗粒浓度的增加，传热系数增加，但是不能说传热增强随着雷诺数增加而增加。这项研究与以前的论文相结合的结果表明，与传统的直径热交换器相比，MCHS将获得更低的Nu数和更高的传热系数。它显示了在这种热交换器中传导和对流传热机制的重要性。

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  • 来源
    《Energy Conversion & Management》 |2014年第10期|28-38|共11页
  • 作者

    S.M. Peyghambarzadeh; S.H. Hashemabadi; A.R. Chabi; M. Salimi;

  • 作者单位

    Department of Chemical Engineering, College of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran;

    Computational Fluid Dynamic (CFD) Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846, Iran;

    Department of Chemical Engineering, College of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran;

    Department of Chemical Engineering, College of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran;

  • 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

    MicroChannel heat sink; CuO/water and Al_2O_3/water nanofluids; Heat transfer coefficient; Pressure drop;

    机译：微通道散热器;CuO /水和Al_2O_3 /水纳米流体;传热系数;压力下降;

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