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首页> 外文期刊>Heat Transfer Engineering >Combined Effect of Mixed Convection and Surface Radiation Heat Transfer for Thermally Developing Flow in Vertical Channels
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Combined Effect of Mixed Convection and Surface Radiation Heat Transfer for Thermally Developing Flow in Vertical Channels

机译：对流和表面辐射换热的组合效应对垂直通道热流动的影响。

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摘要

Combined effect of laminar flow mixed convection and surface radiation heat transfer for thermally developing airflow in a vertical channel heated from a side has been experimentally examined with different thermal and geometric parameters. The channel boundary is made of two isothermal walls and two adiabatic walls, the isothermal parallel wall is heated uniformly and the opposite cold wall temperature is maintained equal to the inlet conditions. The heated wall temperature ranged from 55 to 100°C, Reynolds number ranged from 800 to 2900 and the heat flux was varied from 250 to 870 W/m2. To cover the wide range of Reynolds numbers, two aspect ratios of square and rectangular section were used. Surface radiation from the internal walls is considered through two emissivities i.e. 0.05 and 0.85, to represent weak and strong radiation effects, respectively. From the experiments, surface temperature and Nusselt number distributions of convection and radiation heat transfer are obtained for different heat flux values. Flow structure inside the channel is visualized to observe the flow pattern. The results show the combined effect of laminar flow mixed convection and surface radiation on the total heat transfer rate within the channel. The accumulating buoyancy force and airflow moves together vertically in the upward direction to give significant heat transfer enhancement in the vertical orientation of the channel.
机译：实验研究了层流混合对流和表面辐射换热对从侧面加热的垂直通道中的气流进行热发展的综合效果，并采用了不同的热学参数和几何学参数进行了实验研究。通道边界由两个等温壁和两个绝热壁组成，等温平行壁被均匀加热，并且相反的冷壁温度保持等于入口条件。加热后的壁温范围为55至100°C，雷诺数范围为800至2900，热通量范围为250至870 W / m2。为了覆盖广泛的雷诺数，使用了正方形和矩形截面的两个长宽比。通过两个发射率即0.05和0.85来考虑来自内壁的表面辐射，分别代表弱辐射和强辐射。通过实验，获得了不同热通量值的对流和辐射传热的表面温度和努塞尔数分布。可视化通道内部的流动结构以观察流动模式。结果表明层流混合对流和表面辐射对通道内总传热速率的综合影响。累积的浮力和气流沿向上方向垂直一起移动，从而在通道的垂直方向上显着增强了热传递。

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  • 来源
    《Heat Transfer Engineering》 |2018年第4期|27-39|共13页
  • 作者

    Rajamohan Ganesan; Ramesh Narayanaswamy; Kumar Perumal;

  • 作者单位

    Faculty of Engineering and Science, Curtin University, Sarawak, Malaysia;

    Department of Mechanical Engineering, Curtin University, Perth, Australia;

    Faculty of Engineering and Science, Curtin University, Sarawak, Malaysia;

  • 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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