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EG/CNTs Nanofluids Engineering and Thermo-RheologicalCharacterization

机译：EG / CNTs纳米流体工程与热流变特性

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摘要

The research work presented here intends to contribute to the overall research effort towards nanofluids engineering and characterization. To accomplish the latter, multiwalled carbon nanotubes (MWCNTs) are added to an ethylene glycol (EG) based fluid. Different aspects concerning the nanofluids preparation and its thermal characterization will be addressed. The study considers and exploits the relative influence of CNTs concentration on EG based fluids, on the suspension effective thermal conductivity and viscosity. In order to guarantee a high-quality dispersion it was performed a chemical treatment on the MWCNTs followed by ultrasonication mixing. Furthermore, the ultrasonication mixing-time is optimized through the UV-vis spectrophotometer to ensure proper colloidal stability. The thermal conductivity is measured via transient hot-wire within a specified temperature range. Viscosity is assessed through a controlled stress rheometer. The results obtained clearly indicate an enhancement in thermal conductivity consistent with carbon nanotube loading. The same trend is observed for the viscosity, which decreases with temperature rise and its effect is nullified at higher shear rates.
机译：本文介绍的研究工作旨在为纳米流体工程和表征的整体研究工作做出贡献。为了实现后者，将多壁碳纳米管（MWCNT）添加到基于乙二醇（EG）的流体中。将涉及纳米流体制备及其热表征的不同方面。该研究考虑并利用了CNTs浓度对EG基流体的相对影响，以及悬浮液的有效导热率和粘度。为了确保高质量的分散体，先对MWCNT进行化学处理，然后进行超声混合。此外，通过紫外可见分光光度计优化了超声混合时间，以确保适当的胶体稳定性。通过指定温度范围内的瞬态热线测量热导率。通过受控的应力流变仪评估粘度。获得的结果清楚地表明与碳纳米管负载量一致的热导率的提高。对于粘度观察到相同的趋势，其随着温度升高而降低，并且在较高的剪切速率下其作用无效。

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  • 来源
    《Journal of nano research》 |2011年第2011期|p.69-74|共6页
  • 作者

    B.C. Lamas; M.A.L. Fonseca; F.A.M.M. Gongalves; A.G.M. Ferreira; M.A.Fonseca; S. Kanagaraj; N. Martins; M.S.A. Oliveira;

  • 作者单位

    Departamento de Engenharia Mecanica, Universidade de Aveiro, Campus Universitario deSantiago, 3810-193, Aveiro, Portugal;

    Departamento de Engenharia Mecanica, Universidade de Aveiro, Campus Universitario deSantiago, 3810-193, Aveiro, Portugal;

    Departamento de Engenharia Mecanica, Universidade de Aveiro, Campus Universitario deSantiago, 3810-193, Aveiro, Portugal;

    Departamento de Engenharia Quimica, Universidade de Coimbra, Polo II, Rua Sflvio Lima, 3030-790 Coimbra, Portugal;

    Departamento de Engenharia Quimica, Universidade de Coimbra, Polo II, Rua Sflvio Lima, 3030-790 Coimbra, Portugal;

    Mechanical Engineering Department, NT Guwahati, Assam, India;

    Departamento de Engenharia Mecanica, Universidade de Aveiro, Campus Universitario deSantiago, 3810-193, Aveiro, Portugal;

    Departamento de Engenharia Mecanica, Universidade de Aveiro, Campus Universitario deSantiago, 3810-193, Aveiro, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanofluids; thermal conductivity; colloidal stability; viscosity.;

    机译：纳米流体导热系数;胶体稳定性粘度。;

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