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Numerical Investigation of Flow and Heat Transfer Characteristics of Two Tandem Circular Cylinders of Different Diameters

机译：两个不同直径的串联圆柱的流动和传热特性的数值研究

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摘要

Unsteady laminar flow and heat transfer characteristics from a downstream cylinder of two tandem circular cylinders of different in diameters are numerically investigated. The working fluid is air, and the downstream cylinder is isothermal while the upstream cylinder is kept adiabatic. Two-dimensional numerical simulations are carried out for Reynolds numbers of 100 and 200. The ratio of the upstream to downstream cylinder diameters (diameter ratio) and the ratio of the gap distance to the downstream cylinder diameter (gap ratio) are considered in the range of 0.3 to 2 and 05 to 4, respectively. Numerical solutions are obtained using the FLUENT~® software. The flow parameters such as the rms lift/drag coefficients and Strouhal numbers are computed and analyzed for the diameter ratio and gap ratio intervals investigated. The iso-vorticity lines and isotherms are also generated to understand, identify and analyze the flow and heat transport characteristics. Four basic flow structures are observed and classified as (ⅰ) over-shoot, (ⅱ) symmetric-reattachment, (ⅲ) front-side reattachment and (ⅳ) co-shedding flow. The critical spacing, which marks the minimum gap spacing for the vortex formation to begin, depends on the diameter ratio and Reynolds number, and it decreases with increasing Reynolds number. The convective heat transfer phenomenon is observed to be strongly influenced by diameter ratio, gap ratio and Reynolds number. The mean and the local Nusselt number along the perimeter of isothermal cylinder are computed and discussed in connection with the flow characteristics.
机译：数值研究了两个直径不同的串联圆柱体的下游圆柱体的非定常层流和传热特性。工作流体是空气，下游气缸等温，而上游气缸保持绝热。对于100和200的雷诺数进行了二维数值模拟。在此范围内考虑了上游和下游圆柱直径的比（直径比）以及间隙距离与下游圆柱直径的比（间隙比）。分别为0.3到2和05到4。使用FLUENT〜®软件可获得数值解。计算流量参数，如均方根升力/阻力系数和Strouhal数，并针对所研究的直径比和间隙比间隔进行分析。还生成等涡线和等温线，以了解，识别和分析流动和热传递特性。观察到四个基本流动结构，并将其分类为（ⅰ）过冲，（ⅱ）对称重新附着，（ⅲ）正面重新附着和（ⅳ）共同流。临界间距是开始形成旋涡的最小间隙，它取决于直径比和雷诺数，并且随着雷诺数的增加而减小。对流传热现象受到直径比，间隙比和雷诺数的强烈影响。结合流动特性计算并讨论了沿着等温圆柱体周长的平均值和局部Nusselt数。

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  • 来源
    《Heat Transfer Engineering》 |2017年第18期|1367-1381|共15页
  • 作者

    Necati Mahir; Zekeriya Altac;

  • 作者单位

    Mechanical Engineering Department, Eskisehir Osmangazi University, Eskisehir, Turkey;

    Mechanical Engineering Department, Eskisehir Osmangazi University, Eskisehir, Turkey;

  • 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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