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首页> 外文期刊>Heat Transfer Engineering >Numerical Investigation on Conjugate Heat Transfer Performance of MicroChannel Using Sphericity-Based Gold and Carbon Nanoparticles
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Numerical Investigation on Conjugate Heat Transfer Performance of MicroChannel Using Sphericity-Based Gold and Carbon Nanoparticles

机译：基于球形度的金和碳纳米粒子的微通道共轭传热性能的数值研究

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摘要

Numerical study has been carried out on the laminar forced convection flow of nanofluids in a wide rectangular microchannel. The flow and heat transfer characteristics of gold and of single-walled carbon (SWCNT) nanofluids are investigated in order to find an efficient and cost-effective heat transfer fluid. The effects of nanoparticle volume concentration and of spherical and cylindrical particulate sizes on the conjugate heat transfer performance of the microchannel are reported. The effective thermal conductivity of a nanofluid is evaluated on the basis of particle sphericity by considering the volume and surface area of the nanoparticles. The average convective heat transfer coefficient increases with increase in Reynolds number and volume concentration. Moreover, sphericity-based thermal conductivity evaluation showed that increasing the length of the SWCNT nanoparticle has significant effect on the heat transfer performance, concluding that axial heat conduction dominates the radial heat conduction within the nanoparticle. The carbon nanofluid is identified as an optimized heat transfer fluid with better heat transfer characteristics in comparison with the gold nanofluid. It also reduces the cost of the working fluid. The variations in the interface temperature between solid and fluid regions are reported for nanofluids with different concentrations at different Reynolds numbers. The diameter and length of the SWCNT nanoparticle show a significant effect on heat transfer characteristics.
机译：已经对宽矩形微通道中纳米流体的层流强迫对流进行了数值研究。研究金和单壁碳（SWCNT）纳米流体的流动和传热特性，以便找到一种高效且具有成本效益的传热流体。报道了纳米颗粒体积浓度以及球形和圆柱形颗粒尺寸对微通道共轭传热性能的影响。通过考虑纳米颗粒的体积和表面积，基于颗粒球形度评估纳米流体的有效导热率。平均对流传热系数随雷诺数和体积浓度的增加而增加。此外，基于球形度的热导率评估表明，增加SWCNT纳米颗粒的长度对传热性能具有重要影响，从而得出结论，轴向导热占纳米颗粒内部径向导热的主导。与金纳米流体相比，碳纳米流体被认为是具有更好传热特性的优化传热流体。这也降低了工作流体的成本。对于在不同雷诺数下具有不同浓度的纳米流体，报道了固体和流体区域之间界面温度的变化。 SWCNT纳米颗粒的直径和长度显示出对传热特性的显着影响。

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  • 来源
    《Heat Transfer Engineering》 |2017年第4期|87-102|共16页
  • 作者

    Rajesh Nimmagadda; Kondapalli Venkatasubbaiah;

  • 作者单位

    Department of Mechanical & Aerospace Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India;

    Department of Mechanical & Aerospace Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India;

  • 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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