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On the Influence of Tube Row Number for Mixed Convection Around Microtubes

机译：管行数对微管周围混合对流的影响

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摘要

A numerical simulation was performed on the heat transfer of mixed convection for fluid flowing across a microtube bundle, using the lattice Boltzmann method. At first, the program code was validated by using a benchmark case of natural convection around a hot single tube inside a square enclosure. The local and averaged heat transfer coefficients of each tube in the bundle with various row numbers were calculated. Numerous cases were simulated, ranging from a weak natural convection case (forced convection) to a pure natural convection case. The results indicate that the total averaged Nusselt number outside the tubes gradually decreases and becomes almost a constant with tube row number at low Reynolds number, which is different from the conventional scaled tube. The averaged Nusselt numbers and temperature fields for various situations were compared. Further influencing factors other than the tube row number on the heat transfer behavior of a tube bundle were also summarized and discussed.
机译：使用格子Boltzmann方法对流过微管束的流体的对流混合传热进行了数值模拟。首先，通过在方形外壳内部围绕热单管的自然对流基准案例验证程序代码。计算了具有不同行号的束中每个管的局部和平均传热系数。模拟了许多情况，从弱自然对流情况（强制对流）到纯自然对流情况。结果表明，在低雷诺数下，试管外的总平均努塞尔数逐渐减小，并且几乎与管数成常数，这与常规的定标试管不同。比较了各种情况下的平均努塞尔数和温度场。还总结并讨论了除管排数以外的其他影响管束传热性能的因素。

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  • 来源
    《Heat Transfer Engineering》 |2014年第4期|171-177|共7页
  • 作者

    CHUANSHAN DAI; QIUXIANG WANG; BIAO LI;

  • 作者单位

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, School of Mechanical Engineering, Tianjin University, Tianjin, China;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, School of Mechanical Engineering, Tianjin University, Tianjin, China;

    Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, School of Mechanical Engineering, Tianjin University, Tianjin, China;

  • 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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