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Thermal Performance Assessment of Turbulent Tube Flow Through Wire Coil Turbulators

机译：绕线线圈湍流管内湍流流动的热性能评估

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摘要

This paper presents characteristics of turbulent convective heat transfer in a tube fitted with wire coil turbulators. Two different wire coils are introduced: (1) with typical/uniform coil pitch ratio (CR) and (2) with periodically varying three-coil pitch ratio. Various uniform coil pitch ratios (CR = 4, 6, and 8) and two periodically varying coil pitch ratios, the D-coil (decreasing three-coil pitch ratio arrangement) and DI-coil (decreasing/increasing three-coil pitch ratio arrangement), are experimentally investigated in a uniform heat flux tube. The experiments are performed for turbulent flows with Reynolds numbers ranging between 4500 and 20,000. All of the experimental results are compared with those obtained from using the plain tube, while the thermal performance factor is evaluated under an equal pumping power constraint. The experimental results show that the use of the tube fitted with all wire coils leads to an advantage on the basis of heat transfer enhancement over the plain tube with no insert. It is also observed that the uniform-pitch wire coil with higher coil pitch ratio (CR = 8) gives a higher thermal performance factor compared to ones with lower coil pitch ratios (CR = 4 and 6). In addition, for two periodically varying coil pitch ratios, the Dl-coil performs with better heat transfer rate than the uniform-pitch ratio (CR = 6) and the D-coil for all Reynolds number ranges studied. The empirical correlations developed in terms of coil pitch ratios (CR), varying coil pitch ratios (D-coil and Dl-coil), and Reynolds number are fitting the experimental data within plus or minus 3% and 5% for Nusselt number (Nu) and friction factor (f), respectively. The results of the thermal performance factor for various CR, D-coil, and Dl-coil values are also determined.
机译：本文介绍了装有线圈螺旋湍流器的管中湍流对流换热的特性。介绍了两种不同的线圈：（1）具有典型/均匀的线圈螺距比（CR）和（2）具有周期性变化的三线圈螺距比。各种均匀的线圈螺距比（CR = 4、6和8）和两个周期性变化的线圈螺距比，D线圈（减小三线圈螺距比布置）和DI线圈（减小/增加三线圈螺距比布置） ），在均匀的热通量管中进行实验研究。实验是针对雷诺数在4500至20,000之间的湍流进行的。将所有实验结果与使用普通管获得的结果进行比较，同时在相等的泵浦功率约束下评估热性能因子。实验结果表明，与没有插入件的普通管相比，使用装有所有线圈的管在传热增强的基础上具有优势。还可以观察到，与线圈节距比（CR = 4和6）相比，线圈节距比（CR = 8）高的均匀间距线圈具有更高的热性能因子。此外，对于两个周期性变化的线圈螺距比，对于所有研究的雷诺数范围，D1线圈的传热速率均优于均匀螺距比（CR = 6）和D线圈。根据线圈螺距比（CR），变化的线圈螺距比（D线圈和Dl线圈）以及雷诺数建立的经验相关性将实验数据拟合为Nusselt数（Nu）的正负3％和5％ ）和摩擦系数（f）。还确定了各种CR，D线圈和D1线圈值的热性能因子的结果。

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  • 来源
    《Heat Transfer Engineering》 |2011年第12期|p.957-967|共11页
  • 作者

    SMITH EIAMSA-ARD; VICHAN KONGKAITPAIBOON; PONGJET PROMVONGE;

  • 作者单位

    Department of Mechanical Engineering, Mahanakorn University of Technology, Bangkok, Thailand;

    Department of Mechanical Engineering, Mahanakorn University of Technology, Bangkok, Thailand;

    Department of Mechanical Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;

  • 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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