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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical Conjugate Air Mixed Convection/Non-Newtonian Liquid Solidification For Various Cavity Configurations And Theological Models
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Numerical Conjugate Air Mixed Convection/Non-Newtonian Liquid Solidification For Various Cavity Configurations And Theological Models

机译：不同腔型和神学模型的数值共轭空气混合对流/非牛顿液体凝固

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摘要

TiO_2 nanoparticle-coated nickel wires were produced by electrical heating in various nanofluid concentrations ranging from 0.01 to 1 wt.% with various processing heat fluxes from 0 to 1000 kW/m2. The experimental results demonstrated up to 82.7% enhancement on critical heat flux (CHF) in condition of coated nickel wire (processed in 1 wt.% with 1000 kW/m~2) boiling in pure water. The contact angle measurement revealed that the hydrophilic porous coating formed by vigorous vaporization of TiO_2 nanofluid in nucleate boiling regime enormously modified the wettability of heating surface consequently improving the CHF. Besides, it is evident that the coverage of nanoparticle deposition tended to become more complete as concentration and processing heat flux increased based on SEM and EDS analysis. The nano-particles dispersed in base fluid exhibited little effect on CHF enhancement and could even hinder the percentage of CHF augmentation from boosting, which demonstrated that one could enhance CHF by using only small amount of nanoparticles just adequate to form surface coatings instead of preparing working fluid with great bulk. However, according to the boiling curves in all cases of coated nickel wires, it is supposed that the nucleate boiling heat transfer coefficient deteriorates as a result of thermal resistance resulted from the occurrence of nanoparticle deposition. In summary, the coated porous structure of nanoparticles leads to enhance CHF and to decrease boiling heat transfer coefficient.
机译：通过电加热以0.01至1重量％的各种纳米流体浓度和0至1000kW / m 2的各种加工热通量来生产TiO 2纳米颗粒涂覆的镍丝。实验结果表明，在纯净水中沸腾的镀镍镍丝（以1 wt。％的重量以1000 kW / m〜2处理）下的临界热通量（CHF）提高了82.7％。接触角测量表明，在成核沸腾状态下，TiO_2纳米流体的剧烈汽化形成的亲水性多孔涂层极大地改变了受热面的润湿性，从而提高了CHF。此外，显然，基于SEM和EDS分析，随着浓度和加工热通量的增加，纳米颗粒沉积的覆盖范围趋于变得更完整。分散在基础液中的纳米颗粒对CHF增强几乎没有影响，甚至可能阻碍CHF增强的百分比，这表明人们可以通过仅使用少量足以形成表面涂层而不是准备工作的纳米颗粒来增强CHF。体积大的流体。然而，根据所有镀镍线的情况下的沸腾曲线，可以认为，由于发生纳米粒子沉积而导致的耐热性，使核沸腾传热系数变差。总之，纳米颗粒的涂覆的多孔结构导致CHF提高并降低沸腾传热系数。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第24期|p.4895-4903|共9页
  • 作者

    Chen-Kang Huang; Chih-Wei Lee; Chung-Kai Wang;

  • 作者单位

    Department of Bio-Industrial Mechatronics Engineering. National Taiwan University, Taipei 106. Taiwan Corresponding author;

    Department of Bio-Industrial Mechatronics Engineering. National Taiwan University, Taipei 106. Taiwan;

    Department of Bio-Industrial Mechatronics Engineering. National Taiwan University, Taipei 106. Taiwan;

  • 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

    Boiling; Nanofluid; Porous; Deposition; CHF;

    机译：沸腾;纳米流体;多孔;沉积;CHF;

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