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首页> 外文期刊>International Journal of Heat and Mass Transfer >Mixed convective flow and heat transfer of supercritical CO_2 in circular tubes at various inclination angles
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Mixed convective flow and heat transfer of supercritical CO_2 in circular tubes at various inclination angles

机译：圆管内不同倾角的超临界CO_2混合对流与传热

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摘要

We performed the numerical simulations of laminar mixed convective flow and heat transfer in a 0.5 mm diameter and 1000.0 mm length tube. The supercritical carbon dioxide in the tube was cooled at constant wall temperature. The inclination angles were in the range of -90° (vertical downward flow) to 90° (vertical upward flow). The velocity and temperature distributions, secondary flow, friction factor and heat transfer coefficient were plotted vs. inclination angles and gravity force magnitudes. The kinetic energy of secondary flow was introduced to quantify its effect on the heat transfer. It is found that under the mixed convective flow and heat transfer conditions, the horizontal flow display the largest heat transfer coefficients. The inclined flows at a=-30° and 30° also behave better heat transfer performance among various inclination angles. The effect of inclined angles on the heat transfer is decreased with decreases in the gravity force magnitudes. The combined parameter of Gr/Re_b~2, was used to quantify the buoyancy force effect on the flow and heat transfer.
机译：我们在直径为0.5 mm，长度为1000.0 mm的管中进行了层流混合对流流动和传热的数值模拟。管中的超临界二氧化碳在恒定的壁温下冷却。倾斜角在-90°（垂直向下流动）至90°（垂直向上流动）的范围内。绘制了速度和温度分布，二次流，摩擦系数和传热系数与倾角和重力大小的关系曲线。引入二次流的动能以量化其对热传递的影响。研究发现，在对流和传热混合的条件下，水平流的传热系数最大。在各种倾角之间，a = -30°和30°的倾斜流也表现出更好的传热性能。倾斜角对传热的影响随着重力大小的减小而减小。 Gr / Re_b〜2的组合参数用于量化浮力对流动和传热的影响。

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  • 作者

    Chuanyong Yang; Jinliang Xu; Xiaodong Wang; Wei Zhang;

  • 作者单位

    The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, PR China;

    The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, PR China;

    The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, PR China;

    The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, 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

    Numerical simulation; Mixed convection; Supercritical CO_2; Heat transfer;

    机译：数值模拟混合对流;超临界CO_2;传播热量;

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