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首页> 外文期刊>International Journal of Heat and Mass Transfer >Double diffusion natural convection in a square cavity filled with nanofluid
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Double diffusion natural convection in a square cavity filled with nanofluid

机译：充满纳米流体的方腔中的双扩散自然对流

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摘要

Double diffusive natural convection of nanofluid is commonly found in renewable energy engineering. However, nowadays our understanding on its fundamental characteristics is still limited. Especially, three crucial questions on its fundament have not been answered yet: (1) its performance not only in laminar regimes but also beyond laminar regimes, (2) the influence of the ratio of buoyancy forces on heat and mass transfer, (3) the correlation among the dimonsionless quantities which describe the features of this kind of convection. The present work tries to reveal the characteristics of double diffusive natural convection of nanofluid over a wide range, from laminar regimes to turbulent regimes, with the aid of numerical experiments. It is observed that the behavior of nanofluid in the laminar regimes is different from that in the turbulent regimes. Some conclusions presented in previous literature for laminar double diffusive of nanofluid may be invalid in its turbulent counterpart. The effect of the ratio of buoyancy forces on heat and mass transfer of nanofluid possesses some similarities with the pure base fluid as well as some obvious differences. Especially, a power-like correlation among the Nusselt number, Sherwood number, Rayleigh number, ratio of buoyancy forces and nanoparticle volume fraction has been extracted for the first time through our numerical experiments.
机译：纳米流体的双扩散自然对流在可再生能源工程中很常见。但是，如今，我们对其基本特征的理解仍然有限。尤其是，关于其基本原理的三个关键问题尚未得到解答：（1）它不仅在层流状态下而且在层流状态下的性能，（2）浮力比对传热和传质的影响，（3）无量纲量之间的相关性描述了这种对流的特征。本研究试图通过数值实验揭示从层流态到湍流态的纳米流体双扩散自然对流的特征。观察到纳米流体在层流状态下的行为不同于在湍流状态下的行为。先前文献中关于纳米流体的层流双扩散的一些结论在其湍流对应物中可能是无效的。浮力比对纳米流体传热和传质的影响与纯基础流体有一些相似之处，也有一些明显的区别。特别是，通过我们的数值实验首次提取了努塞尔数，舍伍德数，瑞利数，浮力比和纳米粒子体积分数之间的幂函数相关性。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2016年第4期|1070-1083|共14页
  • 作者

    Sheng Chen; Bo Yang; Kai H. Luo; Xiaopeng Xiong; Chuguang Zheng;

  • 作者单位

    Faculty of Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom,State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;

    Department of Mechanical Engineering, University College London, London WC1E 7JE, United Kingdom;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, 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

    Nanofluid; Turbulent natural convection; Double diffusive convection; Large eddy simulation; Lattice Boltzmann method;

    机译：纳米流体湍流自然对流;双扩散对流;大涡模拟;格子波尔兹曼法;

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