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首页> 外文期刊>International Journal of Heat and Mass Transfer >The impacting mechanism of surface properties on flow and heat transfer features in nanochannel
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The impacting mechanism of surface properties on flow and heat transfer features in nanochannel

机译：表面特性对纳米通道流动和传热特征的影响机制

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摘要

Convective heat transfer of hot fluid flowing through a cold parallel plate nanochannel with constant wall temperature is investigated with molecular dynamics. The effects of surface properties including rough morphology and wall-fluid interaction on the heat transfer and flow characteristics are probed. Different surface wettability characterized by the strong and weak wall-fluid interaction as well as five rough morphologies corresponding to various nanostructure morphology periods, are considered. It is noteworthy that the rough morphology and wall-fluid interaction are key parameters for affecting the flow and heat transfer characteristics. The results show that flow resistance and Nusselt number decrease with the increase of rough morphology period as well as the decrease of wall-fluid interaction. Under the same wall-fluid interaction, the best heat transfer enhancement in rough channel is obtained at the morphology period of 12 Å, while a minimum flow resistance in rough channel is obtained at the morphology period of 48 Å. Another novelty finding is that the combination of surface rough morphology and weak wall-fluid interaction will bring a favorable impact on the heat transfer enhancement and drag reduction. Under the weak wall-fluid interaction, the synthesis performance coefficient corresponding to the rough morphology period of 12 Å is highest among all considered rough morphologies, which indicates that the rough morphology with morphology period of 12 Å is optimal to reduce the flow resistance and improve heat transfer performance jointly.
机译：采用分子动力学研究流过冷平行板纳米通道的热流体的热流传热。探测了表面性能的影响，包括粗糙的形态和壁流体相互作用对传热和流动特性。考虑了具有强大壁流体相互作用以及对应于各种纳米结构形态周期的五个粗糙形态的不同表面润湿性。值得注意的是，粗糙的形态和壁流体相互作用是影响流动和传热特性的关键参数。结果表明，随着粗糙的形态周期的增加以及壁流相互作用的降低，流动阻力和良好的数量降低。在相同的壁流体相互作用下，在12埃的形态周期获得粗沟道中的最佳热传递增强，而在48Å的形态周期获得粗沟道中的最小流动阻力。另一个新颖的发现是表面粗糙形态和弱壁流体相互作用的组合将对传热增强和减少减少带来有利的影响。在弱壁流体相互作用下，对应于12埃的粗糙形态周期的合成性能系数在所有被认为是粗糙的形态中最高，这表明12埃的形态周期的粗糙形态是最佳的，以降低流动阻力和改善传热性能联合。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121441.1-121441.10|共10页
  • 作者

    Shuting Yao; Jiansheng Wang; Xueling Liu;

  • 作者单位

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy MOE School of Mechanical Engineering Tianjin University Tianjin 300350 PR China College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 PR China;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy MOE School of Mechanical Engineering Tianjin University Tianjin 300350 PR China;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy MOE School of Mechanical Engineering Tianjin University Tianjin 300350 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

    Rough channel; Convective heat transfer; Nanostructure morphology period; Flow resistance;

    机译：粗略频道;对流传热;纳米结构形态周期;流动阻力;

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