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An experimental study of pressure drop and friction factor for laminar and transition opposing mixed convection in entrance region of rectangular duct

机译：矩形管道入口区域内层流和过渡对流混合对流的压降和摩擦系数的实验研究

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摘要

The laminar and transition opposing mixed convection was experimentally investigated when the air flow was in the entrance region through a rectangular duct. The pressure drops were measured under different air flowrates, convective heat fluxes and inclination angles, with the maximum value less than 6.0 Pa. The friction factors were calculated and analyzed under different Reynolds numbers, Grashof numbers and inclination angles. The results indicated that the pressure drops increased with the mean air velocity, and the friction factors showed different characteristics when the Reynolds numbers were larger or smaller than 1500. Finally, the correlations of friction factors were fitted considering the influences of Reynolds number, Grashof number, inclination angle and length to diameter ratio, which fitted the experimental data with the deviations less than ±10.0%.
机译：当气流通过矩形管道进入入口区域时，对层流和过渡对流混合对流进行了实验研究。在不同的空气流量，对流热通量和倾角下测量压降，最大值小于6.0 Pa。在不同的雷诺数，Grashof数和倾角下计算和分析摩擦系数。结果表明，当雷诺数大于或小于1500时，压降随平均风速的增加而增大，摩擦系数表现出不同的特性。最后，考虑雷诺数，格拉斯霍夫数的影响，拟合出摩擦系数的相关性。 ，倾斜角和长径比，与实验数据相符，偏差小于±10.0％。

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  • 来源
    《Energy Conversion & Management》 |2011年第5期|p.2272-2281|共10页
  • 作者

    DaoTong Chong; JiPing Liu; Junjie Yan;

  • 作者单位

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, 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

    mixed convection; opposing flow; pressure drop; friction factor;

    机译：混合对流;对流;压降;摩擦系数;

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