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首页> 外文期刊>Heat Transfer Engineering >Laminar Flow and Heat Transfer Phenomena Across a Confined Semicircular Bluff Body at Low Reynolds Numbers
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Laminar Flow and Heat Transfer Phenomena Across a Confined Semicircular Bluff Body at Low Reynolds Numbers

机译：低雷诺数下穿过一个受限半圆钝体的层流和传热现象

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摘要

The present study is concerned with the simulation of incompressible Newtonian fluid flow and heat transfer over a long semicircular bluff body in a channel at low Reynolds numbers. In particular, wall effects on the forced convection from a (heated) semicircular cylinder confined in a horizontal channel are investigated for Reynolds number = 1-40 and blockage ratio = 16.67-50% for air as the working fluid. Flow and thermal fields are found steady for the preceding range of settings. The onset of flow separation increases as the wall confinement increases. The size of the recirculation zone downstream of a semicircular cylinder is seen to increase almost linearly with Reynolds number for a fixed blockage ratio, but it decreases with increasing blockage ratio for a fixed Reynolds number. As expected, total drag coefficient and its components decrease with increasing value of Reynolds number. However, with increasing blockage ratio, the values of these drag coefficients increase. On the basis of equal projected area, the total drag coefficient for the present flow system is found to be greater than the corresponding drag in the case of the unconfined semicircular cylinder. Similarly, the overall drag in the case of a confined semicircular cylinder is found to be greater than that of a confined circular cylinder for the appropriate range of dimensionless control parameters. The maximum augmentation in heat transfer for blockage ratios of 25% and 50% is found to be approximately 16% and 51% with respect to the corresponding value at the blockage ratio of 16.67% at Reynolds number = 1. Finally, the correlations of wake length, drag coefficient, and average Nusselt number are obtained.
机译：本研究与低雷诺数下通道中长半圆形钝体上不可压缩牛顿流体流动和传热的模拟有关。特别是，对于雷诺数= 1-40和阻塞比= 16.67-50％的空气作为工作流体，研究了壁对封闭在水平通道中的（加热的）半圆形圆柱体强制对流的影响。在上述设置范围内，发现流场和热场稳定。流动分离的开始随着壁限制的增加而增加。对于固定的堵塞比，可以看到半圆形圆柱体下游的再循环区的尺寸几乎随雷诺数线性增加，但是对于固定的雷诺数，其随着堵塞比的增加而减小。正如预期的那样，总阻力系数及其组成随雷诺数的增加而减小。但是，随着阻塞率的增加，这些阻力系数的值会增加。在相等的投影面积的基础上，发现本流动系统的总阻力系数大于无限制半圆柱体情况下的相应阻力。类似地，对于适当的无量纲控制参数范围，发现在受限的半圆柱的情况下的总阻力大于受限的圆柱的总阻力。相对于在雷诺数= 1时的16.67％的阻塞率，相应的值，对于25％和50％的阻塞率，传热的最大增加约为16％和51％。获得长度，阻力系数和平均努塞尔数。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1540-1551|共12页
  • 作者

    ANUJ KUMAR; AMIT DHIMAN;

  • 作者单位

    Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, India;

    Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India;

  • 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);
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