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首页> 外文期刊>Heat Transfer Engineering >Interaction of Surface Radiation With Laminar and Turbulent Natural Convection in Tall Vertical Cavities: Analysis and Heat Transfer Correlations
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Interaction of Surface Radiation With Laminar and Turbulent Natural Convection in Tall Vertical Cavities: Analysis and Heat Transfer Correlations

机译：高垂直腔中表面辐射与层流和湍流自然对流的相互作用：分析和热传递相关性

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摘要

The interaction of surface radiation with laminar and turbulent natural convection in differentially heated vertical cavities, filled with air and of large aspect ratio (greater than 10), is analyzed in this study. The k - ωSST turbulence model is used for the formulation of the convection fluid flow and heat transfer, while the governing equations are discretized by the finite-volume method. As an extension of the scarce previous studies, more realistic conditions with a wide range of parameters are considered in the performed simulations. The presented results show the effect of surface radiation on streamlines, isotherms, turbulent kinetic energy, and temperature and vertical velocity profiles, as well as on local and on average convective and radiative heat transfer. Globally, it is found that surface radiation has a weak effect on the dynamic and thermal fields in the major part of the cavity; however, some influence in the upper and lower zones of the cavity is observed. For design purposes, accurate correlations are developed for average convective and radiative Nusselt numbers that cover emissivity of surfaces between 0 and 1, cold wall temperature ranging from 263 K to 303 K, temperature difference between vertical walls ranging from 5 K to 40 K, width of the cavity between 2.5 cm and 7.5 cm, and height of the cavity between 0.25 m and 6 m (this leads to a Rayleigh number ranging from 10~3 to 2 × 10~6 and an aspect ratio between 10 and 80).
机译：在这项研究中，分析了表面辐射与层流和湍流自然对流在充满空气且纵横比大（大于10）的垂直加热的空腔中的相互作用。 k-ωSST湍流模型用于对流流体流动和传热的公式化，而控制方程则通过有限体积法离散化。作为先前稀疏研究的扩展，在执行的仿真中考虑了具有更广泛参数的更实际条件。提出的结果显示了表面辐射对流线，等温线，湍动能，温度和垂直速度分布以及局部和平均对流和辐射传热的影响。在全球范围内，发现表面辐射对腔体主要部分的动态场和热场的影响微弱。然而，在空腔的上部和下部区域中观察到一些影响。出于设计目的，针对平均对流和辐射Nusselt数开发了精确的相关关系，该数值涵盖了0和1之间的表面的发射率，冷壁温度范围为263 K至303 K，垂直壁之间的温差范围为5 K至40 K，宽度空腔的长度在2.5 cm至7.5 cm之间，空腔的高度在0.25 m至6 m之间（这导致瑞利数在10〜3至2×10〜6的范围内，纵横比在10到80之间）。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1472-1484|共13页
  • 作者

    LAHCEN EL MOUTAOUAKIL; ZAKI ZRIKEM; ABDELHALIM ABDELBAKI;

  • 作者单位

    Cadi Ayyad University, Faculty of Sciences Semlalia, Marrakech, Morocco;

    Cadi Ayyad University, Faculty of Sciences Semlalia, BP 2390, Marrakech 40000, Morocco;

    Cadi Ayyad University, Faculty of Sciences Semlalia, Marrakech, Morocco;

  • 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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