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首页> 外文期刊>International Journal of Heat and Mass Transfer >Internal-flow Nusselt numbers for the low-Reynolds-number end of the laminar-to-turbulent transition regime
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Internal-flow Nusselt numbers for the low-Reynolds-number end of the laminar-to-turbulent transition regime

机译：层流向湍流过渡态的低雷诺数端的内部流Nusselt数

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摘要

For heat exchange devices that operate in the low-Reynolds-number end of the laminar-to-turbulent transition regime, logical design is thwarted by the absence of reliable Nusselt number information. The currently accepted Nusselt number correlation for the transition regime, due to Gnielinski, is restricted to the high-Reynolds-number end of that regime. This limitation results from the need for a valid friction factor-Reynolds correlation for input to the Gnielinski equation. Heretofore, such correlations have been unavailable for the low-Reynolds-number end. By the application of a new fluid flow model which is valid for all flow regimes and smoothly and automatically bridges between regimes, the needed correlations have been determined. On this basis, fully developed Nusselt number results are provided for (a) a round pipe of axially uniform cross section, (b) the downstream end of a round pipe fitted with a conical enlargement (diverging nozzle) at its upstream end, and (c) a parallel-plate channel. All results are for a fluid with Prandtl number equal to 0.7.
机译：对于在层流到湍流过渡状态的低雷诺数端工作的热交换设备，逻辑设计因缺乏可靠的努塞尔数信息而受阻。由于格涅林斯基，目前接受的过渡制度的努塞尔数相关性仅限于该制度的高雷诺数末端。此限制是由于需要有效的摩擦因数-雷诺相关系数来输入Gnielinski方程。迄今为止，这样的相关性对于低雷诺数端是不可用的。通过应用一种新的流体流动模型，该模型对所有流动状态均有效，并且在各状态之间平稳且自动地进行桥接，从而确定了所需的相关性。在此基础上，提供了（a）轴向均匀横截面的圆管，（b）在其上游端装有圆锥形扩口（发散喷嘴）的圆管的下游端，以及（ c）平行板通道。所有结果均针对普朗特数等于0.7的流体。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第3期|p.584-588|共5页
  • 作者

    J.P. Abraham; E.M. Sparrow; W.J. Minkowycz;

  • 作者单位

    Laboratory for Heat Transfer and Fluid Flow Practice, School of Engineering. University of St. Thomas, St. Paul, MN 55105-1079, USA;

    Laboratory for Heat Transfer and Fluid Flow Practice, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455-0111, USA;

    University of Illinois at Chicago, Department of Mechanical and Industrial Engineering, Chicago, IL 60607, USA;

  • 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

    transitional flow; nusselt numbers; low-reynolds number; internal convection;

    机译：过渡流淡色数字;低雷诺数内部对流;

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