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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on the thermal conductivity enhancement of water based nanofluids using different types of carbon nanotubes
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Experimental study on the thermal conductivity enhancement of water based nanofluids using different types of carbon nanotubes

机译：不同类型碳纳米管增强水性纳米流体导热系数的实验研究

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摘要

Carbon nanotubes (CNTs) as the promising nanomaterials have particularly attracted attention from researchers due to their superior thermal features. In the present study, the thermal conductivity properties of three types of CNTs-nanofluids with different CNTs added to de-ionized water were compared and analyzed experimentally. The results show that CNTs-nanofluids exhibit higher thermal conductivities than that of the base fluid, and the thermal conductivities increase with the increase of concentration as well as the increase in temperature. When the CNTs concentration is 0.48 vol% at the temperature 60 ℃, CNTs-nanofluids display the maximum thermal conductivity enhancements of 8.1%, 16.2% and 5.0% for short single-walled nanotubes, long single-walled nanotubes and multi-walled nanotubes nanofluids, respectively. In addition, the long single-walled nanotubes nanofluid shows the highest thermal conductivity values for their high aspect ratio and special surface area. The thermal conductivity enhancements for these nanofluids are almost linear with the increase in CNTs concentration and operating temperature at the tested conditions. A simple linear correlation for predicting the effective thermal conductivities with the concentration and temperature has been developed for the three types of CNTs-nanofluids.
机译：作为有前途的纳米材料，碳纳米管（CNTs）由于其卓越的热特性而特别受到研究人员的关注。在本研究中，对三种类型的CNTs-添加到去离子水中的CNTs的导热性能进行了比较和实验分析。结果表明，CNTs-纳米流体的导热系数比基础流体的导热系数高，并且导热系数随着浓度的增加和温度的升高而增加。在60℃温度下，当CNTs浓度为0.48 vol％时，CNTs-纳米流体对短单壁纳米管，长单壁纳米管和多壁纳米管纳米流体的最大导热率提高了8.1％，16.2％和5.0％。 ， 分别。另外，长的单壁纳米管纳米流体由于其高的长径比和特殊的表面积而显示出最高的热导率值。在测试条件下，这些纳米流体的导热系数几乎与CNT浓度和工作温度的增加呈线性关系。对于三种类型的CNTs-纳米流体，已经开发出一种简单的线性相关系数，用于预测有效导热系数与浓度和温度的关系。

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  • 作者

    Meibo Xing; Jianlin Yu; Ruixiang Wang;

  • 作者单位

    Department of Refrigeration & Cryogenic Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

    Department of Refrigeration & Cryogenic Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China;

    Beijing Engineering Research Centre of Sustainable Energy and Buildings, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, PR China;

  • 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

    Carbon nanotubes; Nanofluids; Thermal conductivity; Enhancement;

    机译：碳纳米管;纳米流体;导热系数;增强功能;

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