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首页> 外文期刊>Heat Transfer Engineering >Turbulent Combined Heat Transfer in a Vertical Square Duct under Variable Thermophysical Properties and Non-Boussinesq Condition
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Turbulent Combined Heat Transfer in a Vertical Square Duct under Variable Thermophysical Properties and Non-Boussinesq Condition

机译：在可变热物理性质和非Boussinesq条件下垂直方形管道中湍流组合传热

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摘要

The objective of the present article is to investigate the effects of thermal radiation on turbulent mixed convection in a vertical square duct under variable thermophysical properties and the non-Boussinesq condition. Both right and left walls are kept at constant temperatures whilst back and front ones are insulated. Participating medium is considered as gray, absorbing and scattering. Dynamic viscosity and thermal conductivity vary with temperature using the power law. Density variation is based on the perfect gas equation of state and it is regarded as the non-Boussinesq condition. Results are presented for both entrance and thermally and hydrodynamically fully developed regions. Numerical simulations are carried out by developing a solver in OpenFOAM and the finite volume method is employed to solve governing equations, k -ω/SST RANS based model is used to simulate turbulence. With a rise in radiation effects by decreasing single scattering albedo, due to reduction in buoyancy effects, the temperature profiles become flattened. As single scattering albedo decreases, mean velocity, temperature, turbulence kinetic energy and mean Nusselt number on both aiding and opposing sides increase significantly. Near the hot wall (aiding side), mean Nusselt number and friction factor for Boussinesq approximation are more than the non-Boussinesq condition. Whilst, near cold wall (opposing side) the non-Boussinesq condition results in greater mean Nusselt number and friction factor.
机译：本文的目的是研究热辐射对可变热物理性质和非BoussinesQ条件下垂直方管中湍流混合对流的影响。右侧和左壁保持在恒定温度下，而后退和前部是绝缘的。参与媒体被视为灰色，吸收和散射。动态粘度和导热率随着电力法的温度而变化。密度变化基于状态的完美气体方程，并且被认为是非BoussinesQ条件。参赛和热和流体动力学和流体动力学完全发达地区提出了结果。通过在OpenFoam中开发求解器来执行数值模拟，并且采用有限体积方法来解决控制方程，基于K-ω/ SST RANS的模型用于模拟湍流。由于浮动效应的降低，通过减少单散射反玻璃，辐射效应升高，温度曲线变平。由于单次散射反玻璃降低，平均速度，温度，湍流动能和平均营销号码在辅助和相反的侧面上显着增加。靠近热墙（Aideide侧），Boussinesq近似的平均良好数量和摩擦因子大于非BoussinesQ条件。虽然，靠近冷壁（相对的侧），非Boussinesq条件导致更大的平均营养数和摩擦因子。

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  • 来源
    《Heat Transfer Engineering》 |2021年第5期|140-164|共25页
  • 作者

    Farzad Bazdidi-Tehrani; Vadoud Emdadi Hor;

  • 作者单位

    School of Mechanical Engineering Iran University of Science and Technology Tehran Iran;

    School of Mechanical Engineering Iran University of Science and Technology Tehran Iran;

  • 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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